Using Toyota Wiring Diagram P1

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USING THE ELECTRICAL WIRING DIAGRAM

One of the keys to a quick and successful electrical diagnosis is correctly using the Toyota Electrical Wiring Diagram or EWD The EWD is not Just a book of wiring diagrams, but an information resource for anything

electrical on the vehicle Everything from connector ID and location to what circuits share splice points is included in this manual

Because there is so much information, it takes a little practice to learn where it is located, and what each of the EWD symbols and individual sections can tell you We will take a detailed look at all of these features, and how to use them in diagnosing an electrical problem

As you follow your instructor’s “tour” of the EWD Sections, it is reeommend- ed that you use the actual EWD, instead of this technician handbook This way, you will be getting a “feel” for the actual tool that you have at your dealership For a review of the EWD and its sections, view the Toyota Technical Training Video Using the Electrical Wiring Diagram (p/n 00401- 42925) Sections of the EWD The EWD is an invaluable too! | K _ OVERALL WIRING DIAGRAM

when diagnosing an electrical GROUND POINTS

problem Knowing where

specific information is, and | I SYSTEM CIRCUITS

the “system” that the book

uses helps to speed up the cH POWER SOURCE (CURRENT FLOW) diagnostic process | G _ ELECTRICAL WIRING ROUTING Fig 2-1 | F RELAY LOCATIONS | E GLOSSARY OF TERMS/SYMBOLS | C TROUBLESHOOTING | B HOWTO USE THIS MANUAL P ABBREVIATIONS Ệ Section Code Page INTRODUCTION A ea TROUBLESHOOTING c Hit ABBREVIATIONS_ dD GLOSSARY OF TERMS AND SYMBOLS E i ELECTRICAL WIRING ROUTING G SYSTEM CIRCUITS_ Io

ABS {ANTI-LOCK BRAKE SYSTEM} HBR INTERIOR LIGHT (WIG wi KEY

AIR CONDITIONING (PUSH CONTROL SWTYVPO NĂNG (LLUMINATED ENTAY+ ae AIR CONDITIONING (LEVER CONTROL SW TYPE) ẨM INTERIOR LIGHT (WG wo KEY

AUTO ANTENNA (S/DI SLLUMINATED ENTRY? mm AUTO ANTENNA (W/G) Gikzmg LIGHT AUTO TURN OFF 7 BACK DOOR LOCK (W/G wio POWER WINDOW) «= RE MOON ROOE Zz

BACK UP LIGHT Gem POWER SEAT mm

CHARGING — POWER SOURCE -=

CIGARETTE LIGHTER AND CLOCK — POWER Window = COMBINATION METER RADIATOR FAN AND CONDENSER FAN (SS FEI I

CRUISE CONTROL HEBER PADI AND PLAYER 15/0 w/ CO PLAYER! Ez i DOOR LOCK fm *A010 AND PLAYER (SD wio CO PLAYER! ›

ELECTRONIC CONTROLLED TRANSMISSION AND A/T INDICATOR (3VZ FEL WEEE PADO ANo PLAYER 1G wio CO PLAYER) RADIO AND PLAYER {WiG wi CD PLAYER? Ị

ELECTRONIC CONTROLLED TRANSMISSION: REAR WINDOW DEFOGGER

AND AsT INDỊC; ATOR i5S FE) _—MEHN BE 8 wiPFA AND WASHER mm

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The Table With the large number of pages and sections in the EWD, the fastest way to of Contents ñnd the wiring diagram or information you need is to use the Table of

Contents

There are two table of contents that are available One is on the title page of the book This lists all of sections (A-K) and the also has an alphabetical list of all the System Circuit Diagrams located in Section I These wiring diagrams are the “heart” of the EWD, and the place to start when diagnosing an electrical problem There is also a listing of each System Circuit Diagram on the first page of Section I Table of Contents

The table of contents is 1 993 TOYOTA CAM RY

found on the title page of the

EWD Asecondiabeof ELECTRICAL WIRING DIAGRAM

contents for just the System Circuit Diagrams is found at

the beginning of Section | Section Code Page Fig 2-2 INTRODUCTION A HOW TO USE THIS MANUAL B TROUBLESHOOTING_ Cc 1 > œ a x m Ss 3 © = ow Ơ G) rm Oo ” ” > a < Oo n ¬ m a = œ > < oO ” < = wo oO rˆ ” m ^ 0 ae fms od

EM (NTERIOR LIGHT (W/G w/ KEY

AIR CONDITIONING (PUSH CONTROL SW TYPE) ILLUMINATED ENTRY) cE

AIR CONDITIONING (LEVER CONTROL SW TYPE) INTERIOR LIGHT (W/G w/o KEY

ILLUMINATED ENTRV)

AUTO ANTENNA ($/D)

AUTO ANTENNA (WIG) LIGHT AUTO TURN OFE BACK DOOR LOCK (W/G w/o POWER WINDOW) ahead

BACK-UP LIGHT " POWER SEAT

CHARGING POWER SOURCE

POWER WINDOW

CIGARETTE LIGHTER AND CLOCK "

COMBINATION METER DOOR LOCK ELECTRONIC CONTROLLED TRANSMISSION

AND A/T INDICATOR (3VZ-FE) ELECTRONIC CONTROLLED TRANSMISSION

AND A/T INDICATOR (5S-FE) ELECTRICALLY CONTROLLED

HYDRAULIC COOLING FAN (3VZ-FE) ENGINE CONTROL (3VZ2-FE) ENGINE CONTROL (5S-FE)

arn mã mia ae _`

RADIATOR FAN AND CONDENSER FAN (5S-FE) RADIO AND PLAYER (S/D w/o CD PLAYER} Eg RADIO AND PLAYER (W/G w/o CD PLAYER) mm REAR WINDOW DEFOGGER REAR WIPER AND WASHER REMOTE CONTROL MIRROR

Ï SRS (SUPPLEMENTAL RESTRAINT SYSTEM) STOP LIGHT (S/DỊ fia

HEADLIGHT (FOR USA) STOP LIGHT (W/G)

HEADLIGHT (FOR CANADA) TAILLIGHT (S/D)

12 TAILLIGHT (W/G)

ILLUUMINATION TURN SIGNAL AND HAZARD

INTERIOR LIGHT (S/D w/ KEY WARNING LIGHT(§/D) 104 ILLUMINATED ENTRY) 120 TURN SIGNAL AND HAZARD

INTERIOR LIGHT (S/D w/o KEY WARNING LIGHT (W/G)

ILLUMINATED ENTRY) UNLOCK AND SEAT BELT WARNING

GROUND POINTS J 238

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Section | System Circuit Diagrams Advantages System Circuit Diagrams The entire EWD is built around the System Circuit Diagram Every number, letter, shape, and shading on the diagram tells you information that can help you to locate or identify components on the car faster Fig 2-3

The EWD is built around the use of the System Circuit Diagrams These wiring diagrams provide “circuit road maps” for individual circuits or systems on the vehicle You'll find that there are a lot of advantages to using this type of diagram over the “old-style” overall wiring diagrams

e More Information

There is a lot of written information (such as component ID’s) on each diagram that works with the support materials/other Sections in the manual Also, the symbols that are used graphically give you information about components, connectors, or wires Understanding the full meaning of the symbols and “ID callouts” will save you time when trying to locate or identify these components on the car ¢ Easier to Use

Every diagram shows only one system at a time The parallel connections to other circuits can be traced using Power Source and Ground Point sections Tracing current flow through the circuit is also easier because the power is at the top and the ground is at the bottom of each page

e Printed in Color

Because the diagrams are printed in color, identifying the wires shown on the wiring diagram in the vehicle harness or at the connectors is a lot easier

| eet ee ee

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Watch for *Asterisks, Specific

(Parenthesis), and @) RADIATOR FAN AND CONDENSER FAN (5S-FE)<————+ engine is

the Title at the Top aan listed in

“ewes the title

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Understanding On each System Circuit Diagram, there is a lot of information that is

the System | given to you through the use of different symbols, colors, numbers, and Circuit Diagram letters Understanding the meaning behind each of these is very important

to effectively use the EWD

Wire Colors Besides being shown in color, wire colors are also indicated by an alphabetical code next to each of the wires The first letter represents the basic wire color, and the second letter indicates the color of the “stripe” on the wire

e Blue Wires

As you look at the list below, note that the color blue is represented by the letter “L” to separate it from the letter “B” used to identify “black” Also note that there is no “light blue” wire designation used in Toyota wiring harnesses If it is any shade of blue, it’s considered blue (L)

¢ Component “Pigtails”

The wire colors of component “pigtails” (such as on an igniter) are not shown in the EWD The colors in the EWD represent the vehicle harness up to where it is connected to the component

e Silver Bands on the Wire Insulation

On some wires, you will find small silver “bands” These bands (which are not shown on the wiring diagram) indicate that the wire uses a PVC insulation This insulation is lighter in weight and thinner than the normal insulation, making the wire diameter appear smaller than it actually is (May look like a 20 ga wire on the outside, but is really a 16 ga when the wire strands are examined.)

Wire Identification @ 3 ©

Wires are identified by color

and by the letters next to the FAN RELAY nae

wire The letter that follows NO.2 9

the “-” is the stripe on the

wire Note that the color ¿ 5

BLUE is represented by the Wire Color: White

leter “L” With Black Stripe

Fig 2-5 =

Wire Color: Black With

@-@® = Black GD = Orange Red Stripe

GED = Brown GED = Pink

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Junction Blocks Junction blocks are used to distribute power and ground to the different circuits A junction block joins the circuits using layers of insulated, solid metal plates, eliminating the need for many additional splices, and improv- ing reliability

Key Features ¢ Grey Shading

Every junction block shown on the wiring diagram is highlighted with grey shading If there is more than one junction block shown in a single diagram, a different grey shading is used for each Junction Block

e ID Numbers

Connections to the J/B are indicated with an oval The J/B number and the connector number are inside the oval, with pin number just to the left Use these ID numbers with the Junction Block and Wire Harness Connector location table in the support section which follows each wiring diagram This table has a written description of where the J/B is located, and a page number in Section F Relay Locations where a complete diagram of the J/B is located

Junction Blocks

Junction Blocks are shown

with grey shading The oval indicates the J/B number, connector number, and pin number Use the ID number on the location table to find where the J/B is located on the vehicle Fig 2-6 15 ECM-1G / Pin Number Junction Block Grey Shading ire) Connector ID Gana RADIATOR FAN AND CONDENSER FAN(5S-FE) @) © +: PARTS LOCATION CODE il SEE PAGE | C0DE | SEE PAGE [ CODE { SEE PAGE ] A1 {29 | t5 jas } | | [ 29 I l J © | RELAY BLOCKS CODE | SEE PAGE | RELAY BLOCKS (RELAY BLOCK LOCATION? ] 2 R/B _NO-8 J

E SEE PAGE YUNCTION BLOCK AND WIRE HARWESS (CONNECTOR LOCATION} 20 COWL WIRE AND J/B WO.1 [INSTRUMENT PANEL LEFT) TA SA 22 EWGINE ROOM HAIN WIRE AND J/B NO.2 (ENGINE COMPARTMENT LEFT) EN COWL WIRE AND J/B WO.2 (ENGINE COMPARTMENT LEFT} 0 E

—_ 24 COWL WIRE AND J/8 WO.3 (BEHIND COMBINATION WETER}

(1) =: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS x \R RELAY LOCATIONS EAl 36(5S-FE} =

V © crouno | OJ/8 No 1 | Instrument Panel Left (See Page 19) Ì

{cope | SEE PAGE 34(3V7-FE} 36(5S-FE] (from Cowl Wire) (from Cowl Wire) O + SPLICE

CODE SEE PAGE

(from Cowl Wire) x3 2Ù) Yellow {from Cowl Wire} (from Cowl W

Taillight Relay ` ƒ Defogger Relay

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Relay Blocks A relay block acts as a central location for relays, harness-to-harness connectors, and fuses Although similar in appearance to a Junction Block, relay blocks are different because they do not have internal circuits inside to distribute power or ground, like a junction block

Key Features e ID Numbers

The ID number in an oval (similar to a J/B), tells you which Relay Block the relay is located in The connector to each relay is identified only by the relay that it is connected to (there is no individual connector number as on a J/B) Note that the Relay Block ID number sequence is integrated into the same sequence as the Junction Block ID’s (This means that if there is a Relay Block #4, there will not be a Junction Block #4.)

¢ No Shading

Relay Blocks are not shaded on the diagram like a Junction Block is ¢ Location on the Vehicle

The location of a Relay Block can be found by matching the ID number on the Relay Block location table in the support section that follows each system circuit diagram This will direct you to a diagram of the relay block located in Section F of the EWD

Relay Blocks RADIATOR FAN AND CONDENSER FAN( 58-FE) 8)

A relay block is indicated by © + PARTS LOCATION

“ovals” at the wire connec- cone | = SEE PAGE cone = SEE PAGE [ CODE | SEE PAGE ca

Ạ 2 23 R1 [2 1 |

tion (with no grey shading)

ID the proper connector by â ô RELAY BLOCKS

[ t00E ] SEE PAGE | RELAY BLOCKS (RELAY BLOCK LOCATION) ]

the relay it is connected to (ats ws |

Use the Relay Location Table ©` JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

and Section F to find the CODE | \SEE PAGE | JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)

ta] 20 COWL WIRE AND J/8 NO (INSTRUWENT PANEL LEFT)

relay on the vehicle | 24 | ;; ENGINE ROOK WAIN WIRE AWD J/B NO.2 {ENGINE COMPARTMENT LEFT?

2€ 22 COWL WIRE AND J/B WO.2 (ENGINE CONPARTNENT LEFT)

Fig 2-7 F——— 2i COWL WIRE AND J/6 NO.3 (BEHIND COMBINATION XETER) |] | CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

CODE | SEE PAGE | SPINING WIRE HARNESS AMO WIRE HARNESS (CONNECTOR LOCATION) —]

EAI | 56(5§-FE) | ENGINE ROOK MAIN WIRE ANO ENGINE ROOM NO.3 WIRE (RADIATOR FAN SHROUD) ] 341397-FE | _————— `] 36(5S-FE} _ / Relay 0 + §PLICE | | Œ > RXB Ey _Engine Compartment Left (See Page 18) a Block ID LFZT[šzzm or 3V Number +)

cole h 1 t1 Deyume Tung

RADIATOR 4 cc E Light Relay No 2 fAN RELAY —®:> 4 ee CANADAN -RH) Fuse 2 D lu HEAD Oa LH} Fuse A/C Magnetic Clutch Relay {for CANAI (for 5S-FE) a Daytime Running ; Light Relay No 2 a {for CANADA) Ss Magnetic Clutch Relay | HEAD {LWR-RH) Fuse

Connector Pin Number on EAO (for CANADA) rladiatar F NUNG Fan Relay No 2

i i i 154 HEAD (LWR- adiator Fan Relay No

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Components/Parts All loads, relays, switches, ECU-type controllers, capacitors (noise filters) and isolation diodes are treated as component parts in the circuit

Key Features e ID Numbers

Each component connector has an ID number This ID number usually begins with the first letter of the name of the component (This is unlike the splice points and harness-to-harness connectors which use the letters E, I, and B to indicate engine compartment, instrument panel, or body wiring harness location.) Use the ID number with the parts location table that follows each wiring diagram This will refer you to a harness connector diagram in Section G where the component connector’s location is shown e “Light Blue” Shading

Parts are always shaded in blue ¢ Common Connectors

When 2 parts or circuits use a common connector (such as the headlight and turn signal circuits using the combination switch connector) the connector name used in the Section G Wire Routing diagram is shown in brackets under the component name Electrical Components/Parts RADIATOR FAN AND CONDENSER FAN(5S-FE)@) © + PARTS LOCATION All electrical components are [ C00E 1 SEE PAGE C0DE † SEE PAGE ] COE | SEE PAGE —| i al $ E6 29

shown with connector ID —+—kš Lên TẾ ¡ Ÿ |

numbers, and light blue

shading If the connector it / -

uses is also part of other — Engine Compartment _ [ _ _Position of Parts in Engine Compartment

circuits, the name called-out [5S-FE]

in the location diagram is 2) €6) OOO tò - ii OO® ©} OO listed in brackets r ) —-~ tT | Fig 2-8 @ : 89 (+8) E5 G) WATER @2 TEMP SW @ (FOR COOLING @ FAN) , _ | lu ep: iN | b

E5 Engine Coolant Temp Sensor (Water Temp Sensor! | H ics Air Control Valve 36 Valve} P 1 Park/Neutral Position SW (Neutral

or Cooling Fan, -FE!

or Water Temp SW (for Cooling Fan, 5S-FE} ' 3 iran Ro", R 1 Radiator Fan Motor (for 5S-FE} ! 5 jnjector No 2 S$ 1° Solenoid Valve (for Hydraulic Moto

b 3 front Airbag Sensor LAI ! 8 Injector No 3 S$ 2 Start Injector Time SW (for 3VZ-FE)

F 3 Front Clearsnee Light LH | 7 Injector No 4 S 3 Starter F 4 Front Clearance nt RH | 8 Injector No 5 (for 3VZ-FE) S 4 Starer F 5 Front Side Marker LH | 9 Injector No 6 (for 3VZ-FE}

F 6 Front Side Marker RH $10 ake Aur Temp Sensor (in-Air Temp Sensor} (for T 1 Throttle Position Sensor

ER Front Turn Signal Light Ud V 1 VSV (for A/C ldle-Up, SS-FE)

F9 Front Wiper Motor ight K 1 Knock Sensor Front (far 3VZ-FE) or Knock Sensor V2 VSV (for EGR System, 5S-FE)

F10 Fuse Box (for 5S-FE} V3 VSV (for Fuel Pressure Up, 3VZ-FE)

K 2 Knock Sensor Rear (for 3VZ-FE} V 4 VSV (for Intake Air Control, 3V2-FE V5 Vehicle Speed Sensor (Speed Sens: 8 3 generator falter M1 Manifold Absotute Pressure Sensor (Vacuum V6 Vehicle Speed Sensor (Speed Sensi Sensor) {for 5S-FE) Electronic Controlled Transmission] V7 Voiume Air Flow (Air Flow Meter) (3 H 3 Headlgne i Re N 1) Noise Filter (for Ignition System)

W 1) Washer Motor

4 i Headlight te RH Q 1 Ol Pressure SW W2 Water Temp Sender

H5 Horn " O 2 Oxygen Sensor ifor California, 5S-FE} H 6 Horn RH O03 Oxygen Sensor Front iMain For 3VZ-FE) or Oxygen

Sensor (Main, for §S-FE)

OQ 4 Oxygen Sensor Rear (Main, for 3VZ-FE)

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Pin Numbers and Connectors

Key Features

Whenever a wire is connected to an electrical component, the pin number is listed next to each wire These pin numbers correspond to the connector diagrams provided in the support section which follows each wiring diagram ¢ Connector ID Connectors at the component are identified by the component connector ID number Connector Color The color of the connector is white unless another color is listed Pin Numbering

Connector pin numbers are always shown from the mating side of the connector, not the “harness” side of the connector If you are backprobing the connector for a voltage check, remember that the pin numbering becomes the “mirror” of what is pictured in the diagram

‘HINT _— Use the wire color in the wiring diagram to “double check” that you are looking at the correct pin

e Dot in the Connector

A“e” in the connector cavity indicates that the cavity is used but by another circuit

X in the Connector

An X in the connector indicates that the cavity is empty Multiple Connectors on a Single Component

If there are multiple connectors on a single component (such as on the TCCS ECM), each connector will have an individual parts/ connector ID number, and will also be identified with a “letter in a circle” This letter in a circle is used as a “shorthand” way to ID the connector next to each of the pins, and is also used on the connector diagrams that follow the System Circuit Diagram

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Pin Numbering on the EWD Pin numbers are next to the wire Use the component ID number to find the connector diagram which is part of the support section The pin numbers are shown from the front or “mating” side of the connector, and not the harness side If there is more

than one connector for a

single component, a letter is assigned as a “call-out” for that connector Fig 2-9 Part/Connector ID Number IDLE AIR CONTROL VALVE CISC VALVE) CFOR A/C IDLE-UP) n 1 tị - Vsý | 6 G L6 pa Ds ei RAD 4 9) 10

BATT ISCC 1sco TSCV EGR +8 7 E E10 ENGINE CONTROL MODULE (ENGINE ANU ELECTRONIC z 7@„: s@,rto() CONTROLLED TRANSMISSION ECU) #20 a NSW ve VIA IDL 11 12 1 TO PARI POSITION\SW CNEUTRAL START SW) Multiple Connector ID Letter Pin Number Color of Connector (if blank - WHITE)

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Connector Joining A connector joining wire harness and wire harness or “harness-to-

_ ess and harness connector” is located within the harness, and is not found at an

individual component ¢ ID Numbers

ID numbers will begin with E for engine, I for instrument panel, and B for body Use the ID number to find the connector in Section G of the EWD

¢ Connector Diagrams

Diagrams for these connectors are not located with the component connectors which follow the wiring diagram Because these connectors are used in a number of different circuits, all the information about them is located in Section G of the EWD The Wire Harness Joining Wire Harness location table describes the location and tells you the page to turn to for the location diagram and connector/ pin details

e Male and Female Terminals

Male and female terminal side of the harness is shown by the

shape of the symbol

Wire Harness to Wire Bal

Harness Connectors

Harness-to-harness connec- | |

tors use a 3-digit ID number

Information on the connectors Connectors with

is located in Section G of the FEMALE terminals are |

EWD numbered left to right ` ÏÏš[% Connectors with MALE

Fig 2-10 5 | x yg; terminals are numbered

ight to left

Connector Joining Wire right to le

Harness to Wire Harness

ID Number Mating End of Connector _ L2 + “il LIGHT FAILURE SENSOR 8 DELAY 11 HOLD — Pin Number ——{: R (W/O REAR SPOILER) G-W (W/ REAR SPOILER) ORAS ERS oR EG RATS PARRA AG LIOR BIE

Shape of the symbol tells you which half of the

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Locating a Harness-to-Harness Connector r—— SYSTEM OUTLINE

CURRENT IS APPLIEO AT ALL TIWES THROUGH A BTOP FUSE TO TERNIWAL 2 OF THE STOP LIGHT SW

WHEN THE J8M]TIQM EM ]§$ TUQWED OW, CUARENT FLOWS FROM THE GAUGE FUSE TO TERMINAL 8 OF THE LIGHT FAILURE SENSOR AND

Use the ID number on the ALSO FLOWS THROUGH THE REAR LIGHT WARNING LIGHT TO TERMINAL 2 OF THE LIGHT FAILUGE SENSOR Location Table Turn to the STOP LIGHT OISCOWMECTION WARNING

WHEM THE [6MITIOM $W LS TURMED OM AMD THE BRAKE PEDAL L$ PRESSED {STOP LIGHT SW ON} IF THE STOP LIGHT CIRCUIT Is

Si H G fe H 0PEk, THE CUREENT FLOWING FRÔM TEEMTMAL$ ? IF THẸ ((EMT FAILURE $ENS0# TƠ TERNIMAL$ 1,2 CHANGES $0 THỂ LIPHT F4†LUEE ection page or pin BEMSOR DETECTS THE OLSCONNECTION AND THE WARMING CIRCUIT OF THE LIGHT FAILURE SENSOR 1S ACTIVATED

: : AS A RERULT, THE CURRENT FLOWS FROM TERMIWAL 4 OF THE CIENT FAILURE SENSOR —> TERMINAL 11 —> GROUND AND TURWS THE numbering and a location REAR LIGHT WARMING LIGHT ON BY PRESSING THE BRAKE PEDAL, THE CURREMT FLOWING TO TERMIMAL 8 OF THE LIGHT FAILURE

SENBOR KEEPS THE WARMING CIRCUIT ON HOLD ANO THE WARNING LIGHT OM UNTIL THE IGNITION SW 18 TURNEO OFF

diagram

SERVICE HINTS sis STOP LIGHT S¥ Fit 2-1 1 2- (CLOSED WITH BRAKE PEOAL DEPRESSED

g L? LIBHT FÁILURE SENSOR

1,2, 7-GROUMD APPROX 12¥OLTS WITH STOP LIGHT Se AM

+ B-OROUNO: APPROX T2YOLTS WITH IGHITIOM S¥ AT OM POSITION

TU-GROUNO: ALWAYS CONTINUITY © : PARTS LOCATION CODE SEE PAGE COE SEE PAGE CODE SEE Pace c3 3 w2] 4 | 30 cr Hi 3 N3 | E° 30 Ri 3t vy 3o ne 3 s0 3o ta x "3 sĩ

[ cove | see Pace [suwcTioN BLOCK AND WIRE HARNESS {CONNECTOR LOCATION UU - _ ]

mo Mí }

te | 2o COWL IRE ANO J/B jSTRUMENT PANEL LEFT

| 1H | 20 [FUOGR WO 1 WIRE AMO J/B NO.I (INSTRUMENT PANEL LEFT) |

Lm [ao [COWL SIRE AMO J/B NO.1 {INSTRUMEMT PANEL LEFT) }

Ẳ ‹: C0NRECT0R JOINING WIRE HARNESS AND WIRE HARNESS

£008 SEE PAGE SHOIMING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATIONE

1â

1ú) FLOOR WO 1 WIRE AMO COWL WINE (LEFT MICK PANEL!

ott 4218/01 LUGGAGE ROOM HO.1 WERE AMO FLOG@ NO.F MIRE (LUGGAGE COMPARTNENT LEFT)

Bạt 42(9/0) FLOOR #Ũ_! WIRE ANG LUGGAGE ROOM NO.2 WIRE (LUGGAGE COMPARTMENT DOOR)

GROUND POINTS

CODE | SEE PAGE | GROUND POIWTS LOCATION ]

42(8/0) FR TH

&L TTT77TI UNOFR THE LEFT QUARTER PILLAR

ba (87D) | BACK PAWEL CEWTER ] + SRLICE POINTS

SEE\PAGE | WIRE HARNESS WITH SPLICE POINTS cope | SEE PAGE | WIRE HARNESS WITH SPLICE POINTS 826 | 42(5/0: LUGGAGE ROOM NO I WIRE 42(S/Â FL008 ÑO.( WIRE 1

ast 42(8/0) LUGGAGE ROQM NO.2 WIRE acr\ LUGBAGE ROOK NO + WIRE £32

\

G_ ELECTRICAL WIRING ROUTING G

Connector Joining Wire Harness and Wire Harness

- = 4

[ 1: Location of C ctor Joining Wire Harness and Wire Harness V_: Location of Ground Points ;

[Sedan] Roof Wire RY [By] Resr DoorRHWeE — \_ CS Floor No 2 Wire i V Luggage Room No 2 Wire

VOIMING WIRE HARNESS AMO WIRE WARNESS (COMMECTOR LOCATION) FUEL GAUGE WIRE AWD FLOOR WO 1 WIRE (UNDER THE REAR BEAT CUSHION)

REAR DOOR RH WIRE AND FLOOR MŨ 2 WIRE (RIGHT CENTER PILLAR)

{| FUEL GAUGE WIME AND FLOOR WO | WIRE {UNDER THE FO oO

LUGGAGE ROOM NO 1 WIRE AND FLOOR WO | WIRE [LUGGAGE CDKPARTNERT LEFT) | FLOOR NO I WIRE AND LUGGAGE ROOW KO 7 WIRE (LUGGAGE COMPARTMENT DOOR} Rear Door

Floor No 1 Wire ews LH Wire Fuel Gauge Luggage Room

Wire [221] No 1 Wire

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Switches and A simple single-pole, single-throw switch is relatively easy to understand on Relays „ wiring diagram However, if the switch is a multi-pole (has more than one

pin that is being switched), or gang type switch (where the movement of the switch lever moves a number of switches open or closed), the symbol used on the wiring diagram can be more difficult to understand

Key Features ¢ Switches are shown in the OFF position

All switches and relays are shown in the OFF position If it’s a relay, you know that the relay coil is not “energized”

¢ Multi-pole Switches

For multi-pole switches such as the Combination Switch, or the Heater Fan Switch, the schematic symbol is a little more complicated A circle and line indicate which pins are connected together under each of the different switch positions On the Heater Fan Switch, a “bus bar” is moved for each switch position, changing the pin connections in the switch

e “Gang” type Switches

If it is a fairly simple “gang” type switch, a dotted line inside the switch will connect the “arms” of the switches together

There is continuity between

Switches Pin 10 and Pin 7 in the OFF position |

Multi-pole switches can be a

tricky to follow In some HAZARD_ SW 10

switches, a circle and line

indicates which pins are HAZARD

connected in a particular switch position On some switches, a “bus bar” is used to show the various pin connections Fig 2-12

Relays are shown

>» cu a If the switch is used as a DE-ENERGIZED

Ox “sensor”, look at the System =“ Outline or Service Hints for

» + the conditions that cause it to Example of Gang-type switch in

$l be open or closed Remote Control Mirror Switch Assembly _ XS ™~ Ny 8 bf j LEFT In the M1 Position, there is continuity

between Pin 2 and |

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Shielding On low voltage/low current flow wires (such as those used on the oxygen sensor, knock sensor, and distributor G and Ne signals) shielding is used When a wire is shielded, an additional ground wire is wrapped around the insulation of the low current wire to absorb any electro-magnetic interfer- ence In the EWD, shielding is represented by a dotted line around a wire Do not confuse this with the dotted line used inside a multi-pole “gang” type switch

CAUTION When checking for voltage in a circuit that uses shielded wires, NEVER puncture the insulation with the test probe! This will short the sensor wire to the ground

Shielded Wires

Shielded wires are indicated |

by a dotted line around a

portion of the wire NEVER g_WoR FROM POWER SOURCE SYSTEM (SEE PAGE 58)

£ 8-0

probe through the insulation of a shielded wire—a short- to-ground will result Fig 2-13 W lê +B FP

là: DATA LINK CONNECTOR 1

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Splice Points In order to distribute power and ground to the various circuits, splices within the harness are used An octagon with an ID number (again with E for engine, J for instrument panel, and B for body, plus a sequential number) is used to represent a splice This ID number corresponds to the splice point location table that follows the wiring diagram This table has both a description of where the splice is located, and the page number of the Section G location diagram

When making checks on the vehicle, use connectors and harness-to- harness connectors as your test point of “first choice” Splices tend to be difficult to find in the harness because they are wrapped in tape or plastic conduit Also, the location diagram given in Section G will give you only a general idea of where the splice is located Inspect the individual splice points only if the checks at the connectors “point to” the splice as being the problem

Splice Point Symbol

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Locating a Splice Point

Look up the ID number on the Splice Location Table Turn to the Section G page listed for a diagram Fig 2-15 (1) $+ CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS VV « GROUND POINTS C) + §PLIcE PorNTs ION BLOCK ý LOCATION LEFT) 20 FLOOR NO.1 cow Ww : NT PANEL LEFT) LOCAT 38 FL ] W

NO.1 WIRE AND FLOOR : COMPARTMENT

„] W ROCM NO ARTMENT DOOR) SEE T UNDFR THE LEFT QUARTER PILLAR } BACK SPLICE POINTS AGE WIRE Rũa0K 1 $2(S/Ð) FLOOR NŨ.I WIRE

42(§5/0) LUGGAGE ROOM NO 2 WIRE 42(8/0) LUGGAGE ROOM NO.I WIRE

G

oO : Location of Connector Joining Wire Harness and Wire Harness _ _

- V : Location of Ground Points _

[Sedan] Roof Wire 5

| © : Location of Splice Points oo ELECTRICAL WIRING ROUTING “Rear Door RH Wire - Luggage Room ⁄ y ¬+ * 5, - £ ~ Ge og Ss 8® HN 2 QP nguy, 2 f° if ~ 4 S 2; ⁄ vn ` i ` “ = ` Ệ 3 - ®€ oN

Rear Door Luggage Room

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Power and Ground

Distribution

Power Distribution Key Features

If there is a problem which causes an entire circuit to be inoperative, the first two areas you need to check are the circuit’s fuse and ground The EWD can direct you to other circuits which share the fuse or ground point By operating these circuits, you can check the condition of the fuse and ground point without making a physical inspection This saves you time! The following sections outline how this is done

If you can find another circuit which uses a particular fuse, and it operates correctly, you will have confirmed that the fuse is GOOD

e Section H Power Source (Current Flow)

Go to the System Circuit Diagram for the problem circuit On the diagram, the fuse is always located at the top of the page To find additional circuits that share the same fuse, use the second chart in Section H Power Source (Current Flow) This multi-page chart lists every load on the vehicle, with the fuse that it’s connected to e Power Source System Circuit Diagram

If you find that a fuse is not receiving B+, use the Power Source system circuit diagram in Section I for fusible link information This color wiring diagram contains all of the features and location information found in each system circuit diagram You can also use the Power Source (Current Flow) chart in Section H The flow chart located at the beginning of Section H also traces the B+ side of the fuse to its fusible link source But, because it does not have all the features of the Power Source System Circuit Diagram (such as connector ID’s, splice ID’s, wire colors, and support sections), it is not as useful

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Section H Power Source (Current Flow) % STOP LIGHT (S/D) FROM POWER SOURCE SYSTEM (SEE PAGE 58> Use this table to find other components that use the

same fuse If the other

component works, the fuse Seay †

is OK._lf you fnd that the @x:@ f9) se [1

fuse is OK, but not receiving 6

B+ use the Power Source H POWER SOURCE (Current Flow Chart) *

4 6

System Circuit Diagram to 120 120 110 120 110, 114 116] 142 WARNING

trace the circuit back to the “Page Nos of [ize tag "7? saaliaa aze, tao 157 tee)” tas rae 215 188/188 278 170 a

Related Systems}30 130 38 vo] 189 794) 194 3 fusible links § c„ Ặ 3 : ` 52 g Slig 2 EELS šs gš 2o Bz BB va Fig 2-16 ¡Š š 3 E|Số š SẺ Y ý tŠNgšfpý Si sẽ PK 2225 ep 2 | Elz see § 8g 5 & 29/5525 58 Flog ee Seal =F § §b|šx Sv SẼ § Fr Ơ độ 2 Š š š Š š|Š 3755 šSẽ|š 2 8 SHezeheh oss 3 CB or Fuse 111 (13 I14 K3 LI|L2 t3 t4 M2M3|MS N2 O1 O5|P1 P2 P3 P4 PS rn 154 TAIL e e 154 ECU-B 204 WIPER 754 TURN ~ 75A IGN Gauge Fuse o 1k gue Ỷ£ 3 > | | : GAUGE ° eee oe Information 108 MIR ATR OO 25A STOP e e 30A POWER e e s eịe © 40A_ DEFOG 10A STARTER

15A HEAD (RH) (USA) | 15A HEAD (LH) (USA) BA Tiare cm YA inna ch 9 75A ALTS 20A DOME e e eeee 15A EFI HAZ-HORN CDS FAN RDI FAN #8 8 & ˆ ° > HE, 16A Tá Regen 7.5A_ DRL (Canadài * These are the see of the first page on which the related system 1s show! lø| a > The part indicated vs IOxated somewhere in the system nor necessarily on the page indicated here “ | 6 ‘| Ị : " | h ' : | rl 7 h 3Í gsz.owr-re = 1 a €30:(5S-FE) < w Zo] fe C———— = ~ FID —- =—— sẻ 3 FUSE BOX et te Sxtexaror {ALTERWATORD a) 4 e T3 I of - + | i sử T0 ABS H =” ACTUATOR 4 Ị Ị f† t2 GNITION su | ad J Mia dat ` w bat / bu Gé â =$ = Ơ ny L ==—————H R10 Mg, oR BR we we ‹ cues | I 6 i of TO STARTER STARTER RELAY eh nats y= dee SLB wo eh q i whine oe w w ‹ now 9 sect] TEANRDA) - anes So 4 15A HEAD CLWR=LK? _ — 081 ' 2 R = ấ S offs

E 5 = 7 DAYTIME RUNNING 7.54 ORL ị i

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Ground Distribution —[n the electrical system, a load’s ground point is often shared with other circuits If another circuit which shares the ground point with your inoperative circuit works properly, then you know that the grounding point is OK This does not eliminate the possibility of a problem on the ground side of the circuit, or a poor connection problem between ground point terminals “stacked” onto a single ground point

Key Features ¢ Ground Point ID

To check the grounding point, look for the triangle shaped ground symbol on the bottom of the page All ground points have a two- letter ID number: the first letter represents Engine, Instrument panel, or Body, the same as with the splice points and harness-to- harness connectors

e Finding Circuits Which Share the Ground Point

Using the Ground Point ID, turn to Section J, Ground Point, in the EWD In this section, each ground point is listed with the names of all components and splices that are connected to it

e Locating the Ground Point on the Vehicle

If you determine that there is a problem with the ground, use the Ground Point Location table that follows the system circuit diagram, for a description of the ground location, and the page number to turn to for a diagram of where the ground point is located Ground Points URE

Look at the “triangle” for the ground ID number For location of the ground on the vehicle, use the ground location table in the support section H30 HI6H MOUL STOP _LIG! |THE RE STOP LIGHT | CREAR COMB STOP LIGHT } CREAR COMB R9 STOP LIGHT LK CREAR COMB LIGHT LH] STOP LIGHT RH CREAR_COMB LIGHT RHJ RB R10 Fig 2-17 HL LHUIH bd

xơ [Oreo ep OT m„rKUrxr-r

20 [COWL WIRE AND J/8 NO.) (INSTRUMENT PANEL LEFT)

oO ' CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

SEE PAGE | JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)

Find the ground we [3 FLOOR WO.1 WIRE ANO COWL WIRE (LEFT KICK PAWEL]

4

” ° oz! I§/D} LUGGAGE ROOM NO 1 WIRE AND FLOOR NŨ.I WIRE (LUGGAGE COMPARTMENT LEFT)

point by using the Bel 4215/0) FLOO! O.1 WIRE ANO LUGGAGE ROOM NO.2 WIRE {LUGGAGE COMPARTMENT DOOR)

Ground ID number V/ + crounn P0INTS

| CODE SEE PAGE GROUND POINTS LOCATION 4218/0)

r> BL 1419/61 UNOFR THE LEFT GUARTER PILLAR

B0 4218/0) BACK PAWEL CENTER

CODE SEE PAGE WIRE HARNESS WITH SPLICE POINTS €00E SEE PAGE WIRE HARNESS WITH SPLICE POINTS

Bis B26 42(S/D} LUGGAGE ROOM WO.1 WIRE

42(S/D} FLOOR NO.I WIRE B30 ————

B31 42(S8/0) LUGGAGE ROOM NO 2 WIRE

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Section J 7 Ground Points J GROUND POINT

AND DATA LINK

Look at Section J, Ground en ESHER eetecrns

Point, for circuits that share the ground, or redundant ground paths CONTROL (ENGINE ECU) SENSOR Fig 2-18 FAN ECU CONNECTOR 2 CTpCL) OXYGEN SENSOR SENSOR (SUB CONNECTION ON METER CALIFORNIA (3VZ-FE) FUEL SENDER OXYGEN SENSOR —- ~ - = = a LÀN - —_ :-|HI6H MDUMT ST0P

Follow the ground ID number

to Section J and to Section G

G_ ELECTRICAL WIRING ROUTING

`1 iL Location of Connector Joining Wire Harness and Wire Harness SỐ 7

_ : Location of Ground Points _

[Se da n] Roof Wire EK

_ Rear Door RH Wire

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Additional

Support Sections

System Outline

In addition to the wiring diagram and location tables, the EWD provides other resources that you can use when diagnosing a problem

The first step in any diagnostic process is to verify the problem To do this, you'll need to know exactly how the system is supposed to work The System Outline is one of the best places for this information This section, which follows immediately after the wiring diagram, describes the operation of the circuit, and maps out the path of current flow “step-by-step” for each mode of operation This is especially useful in circuits which use an ECU to “logically” control a circuit based upon various sensor inputs

The System Outline section is found only with complicated or ECU controlled circuits For many system circuit diagrams, no help is given; you must be able to apply basic circuit theory and your own knowledge about how the circuit works to make a successful diagnosis using the EWD System Outline SYSTEM OUTLINE CURRENT IS APPLIED AT ALL TIMES THROUGH A STOP FUSE TO TERMINAL 2 OF THE STOP LIGHT S¥

Use the System Outline to find not only the “paths of current flow” in the circuit, but most importantly, the SEQUENCE of current flow in the system or circuit, and the CONDITIONS under which the ECU will turn a circuit OFF or ON

Fig 2-19

WHEN THE IGNITION SW IS TURNED ON CURRENT FLOWS FROM THE GAUGE FUSE TO TERMINAL 8 OF THE LIGHT FAILURE SENSOR, AND ALSO FLOWS THROUGH THE REAR LIGHT WARNING LIGHT TO TERMINAL 4 OF THE LIGHT FAILURE SENSOR

STOP LIGHT DISCONNECTION WARNING

WHEN THE IGNITION SW IS TURNED ON AND THE BRAKE PEDAL IS PRESSED (STOP LIGHT SW ON), IF THE STOP LIGHT CIRCUIT IS OPEN, THE CURRENT FLOWING FROM YERWIWALS 7 OF THE LIGHT FAILURE SENSOR TO TERMINALS 1,2 CHANGES, SO THE LIGHT FAILURE SENSOR DETECTS THE DISCONNECTION AND THE WARNING CIRCUIT OF THE LIGHT FAILURE SENSOR IS ACTIVATED

AS A RESULT THE CURRENT FLOWS FROM TERNIWAL 4 OF THE LIGHT FAILURE SENSOR —> TERMINAL 11 —> GROUNG AND TURNS THE REAR LIGHT WARNING LIGHT ON BY PRESSING THE BRAKE PEDAL, THE CURRENT FLOWING TO TERMINAL 8 OF THE LIGHT FAILURE SEWSOR KEEPS THE WARNING CIRCUIT ON HOLD AND THE WARNING LIGHT ON UNTIL THE IGNITION SW IS TURNED OFF

SERVICE HINTS

810STOP LIGHT SW

2-1:CL0SED WITH BRAKE PEOAL DEPRESSED L 2 LIGHT FAILURE SENSOR

1,2, 7-GROUND: APPROX I2VOLTS WITH STOP LIGHT SW ON 4, 8-GROUND: APPROX 12VOLTS WITH IGNITION SW AT ON POSITION

11-GROUND: ALWAYS CONTINUITY © +: PARTS LOCATION C0DE SEE SEE PAGE H10 31 vl 30 t t © + JUNCTION BLOCK AND WIRE HARNESS CONNECTOR AGE 1 ÁND

20 AND NO.t (INSTRUMENT GR LOCATION NO.1 WIRE ANO N0.I ANEL

20 COWL Ww AND NO.1 {INS P LEFT)

LI CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS CODE SEE PAGE JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION) TJ1 38 FLOOR NG.1 WIRE AND COWL WIRE (LEFT KICK PAWEL) B21 42(S/D) LUGGAGE ROOM NO.1 WIRE AND FLOOR NO.1 WIRE {LUGGAGE COWPARTMENT LEFT} Bal 42(8/0) FLOOR NO.1 WIRE AND LUGGAGE ROOM NO.2 WIRE (LUGGAGE COMPARTMENT DOOR} ‹ GROUND POINTS SEE P GROUND POINTS LOCATION 42 UNDFR THE LEFT QUARTER PILLAR } CENTER O SPLICE POINTS

CODE SEE PAGE WIRE HARNESS WITH SPLICE POINTS C0DE SEE PAGE WIRE HARNESS WITH SPLICE POINTS

B15 B26 42(S/0) LUGGAGE ROOM NO.1 WIRE

B16 42(5/0) FLOOR NO.1 WIRE 830

BỊ? 831 42(S/D) LUGGAGE ROOM NO 2 WIRE

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Service Hints Like the System Outline, the Service Hints section follows selected wiring diagrams This section provides pin voltages and/or component resistance values (some of these values are found only in the EWD and are not in the repair manual) However, Service Hints are not supplied with every wiring diagram When they are given, they will cover only some of the pin voltages and resistance values in the circuit

Overall, the EWD relies on your skills and electrical knowledge to determine the amount of voltage you should measure at a particular pin Service Hints - The Service Hints section [> ENGINE CONTROL(SS-FE A/T) |

can have some helpful SERVICE HINTS

information that is not found E 7@.E 4@).£EioŒ) Pee ee Seem CO pULE (ENGINE AND ELECTRONIC CONTROLLED

in the Repair Manual The VOLTAGE AT ENGINE CONTROL MODULE (ECU) WIRING CONNECTOR information In the Engine me ˆ EI: $:0 14 6V0LTE LIÊNTTT0N SW AT ON POSITION)

4B1 - El: 9.0-14.0VOLTS (IGNITION SW AT OM POSITION) Control Section can be of 10L - H 3:0-14.0V0LT8 (IGNITION 8W 0M AND THROTTLE VALVE OPEN}

- : 4.5- 6 1

great help when diagnosing a TCCS related problem VTA EB: 6.3 OcavOLts {HOMITION Sv ON A¥O"TMROTTCE VALVE FULLY cLoséo) 1 3.2- &.9VOLTS (IGNITION SW ON AND THROTTLE VALVE OPEN)

PIN - E2: 3.3- 3.9VOLTS (IGNITION SW AT ON POSITION} #10,920 - £01,602: 9.0-14.0VOLTS (IGNITION SW AT ON POSITION)

Fi 2 20 THẢ - E2: 0.6- 5.4Y0LTS (IGNITION SW ON AND INTAKE AIR TEWP 26°C, 68°F)

IG <- THW - E2: 0.2- t.OVOLTS (IGNITION SW ON AND COOLANT TEMP 80°C, 176°F) STA - El: 6.0-16.0V0LTS (ENGINE CRANKING)

IGT - El: PULSE GENERATION (ENGINE CRANKING OR IOLING)

VY - EI: 9.0-14.0V0LTS {NO TROUBLE AND ENGINE RUNNING)

ACT - El: 9.0-14.0V0LT§ (I6NITION SW 0M AND AIR CONDITIONING ON) TE! - Et: 9.0-f4.0VOLTS {IGNITION SW ON}

WS¥ - Et: 0- 3.OVOLTS (IGNITION SW ON ANO PARK/NEUTRAL POSITION SW {NEUTRAL START SW) POSITION P OR K POSITION) 9.0-14.0VOLTS (IGNITION SW ON AND EX PARK/NEUTRAL POSITION SW (NEUTRAL START SW) POSITION P OR N POSITION) RESISTANCE AT ENGINE CONTROL MODULE (ECU) WIRING CONNECTORS

(DISCONNECT WIRING CONNECTOR) IDL - E@:INFINITY (THROTTLE VALVE OPEN)

2.3K OR LESS {THROTTLE VALVE FULLY CLOSED} VTA ~ E2:3.3 -10.0Kn (THROTTLE VALVE FULLY OPEN)

9.2 - 0.8K (THROTTLE VALVE FULLY CLOSEQ) YC - E2 3.0 - 7.0Kn

THẢ - E2:2.0 - 3.0Kn (INTAKE AIR TEMP 20°C, 68°F} THY - E2:0.2 - 0.4Kn (COOLANT TEMP 80°C, 176°F) GILWE - 6-'0.17-0.21Ko I8CC, 18CO- +8, +B1:19.3-22.3n © + PARTS LOCATION SE 30 © : RELAY BLOCKS [ c00E | SEE PAGE | RELAY BLOCKS (RELAY BLOCK LOCATION) ] [6 | 2 | R/B NO.€6 }

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Overall Wiring In the last section of the EWD, the vehicle wiring diagram is printed in the

(Section K) older map-style format If you were “brought up” with this type of wiring

diagram, you may prefer to use it because “you can see everything at once.” But with all of the added support information that is provided in the Sec- tion I wiring diagrams, there is no real advantage in using the overall wiring diagrams, except for the “familiarity” factor Anything that can be done with the map-style schematic can be done faster using the System Circuit Diagrams and support sections in the EWD

Because there is so much information in the EWD manual, it sometimes can be confusing to use Being able to quickly find the information you want requires practice During this rest of this course, you'll be performing worksheets and diagnosing actual on-car problems to make you more familiar with all of the EWD features Overall Wiring Diagrams Th Ih trng dị _— 8 CAMRY

e overall wiring diagram is T T 7

provided in Section K of the power AF stop com em) Sy Hasard Worning Light (S/D)

EWD While it’s faster to i T 2 T 3 T 2

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