Toyota training body electrical diagnosis ch02

Technician Handbook 652 Body Electrical Diagnosis Technical Training 47 Technician Handbook 652 Body Electrical Diagnosis The Electrical Wiring Diagram The Toyota Electrical Wiring Diagram (EWD) is the roadmap to all the electrical components and wiring in Toyota vehicles The EWD is not just a book of wiring diagrams, but an information resource for anything electrical on the vehicle The EWD includes: •  Overall wiring diagram •  Diagrams for every system circuit •  Power source diagrams •  Ground points •  Junction block and relay locations •  Location of components •  Electrical wire routing •  System operation and troubleshooting hints •  Terms, symbols, abbreviations, and definitions •  Information on “How to Use This Manual” NOTE 48 For the most part, the printed EWD manual and the EWD on TIS contain the same information When there are differences, they will be noted during this course TIS, however, provides different ways to locate information in the EWD and also provides crossreferencing to all service literature on one platform Once you learn how to use these features, you will find the EWD on TIS an invaluable diagnostic tool Technical Training Technician Handbook 652 Body Electrical Diagnosis EWD Overview The Index Because the EWD contains so much information, it takes a little time to learn where the information is located and what the diagrams and symbols can tell you We will take a detailed look at all of these features, and how to use them in diagnosing an electrical problem The first page of the printed EWD is an index to all the sections of the manual With the large number of pages and sections in the EWD, the fastest way to find the diagram or information you need is to use the index The example illustrated here is the index for the 2010 Camry It is representative of all the EWDs from 1990 to present with the following exceptions: •  The Part Number of Connectors section was not introduced until the 1999 model year Prior to that year, connector part numbers are not included in the EWD •  The Connector List section was not introduced until the 2000 model year For earlier years, connectors are listed with the system circuits to which they belong Technical Training 49 Technician Handbook 652 Body Electrical Diagnosis System Circuits Index 50 The majority of your troubleshooting efforts will involve using the system circuit diagrams In the System Circuit Diagram section of the printed EWD, you will find the index to the diagrams for every circuit on the vehicle All the other sections of the EWD provide supporting information for these diagrams Technical Training Technician Handbook 652 Body Electrical Diagnosis EWD on TIS – 2005 MY and Earlier For the 2005 model year and earlier vehicles, the EWD on TIS is an electronic version of the printed manual, containing all the same information as the paper EWD Because it is an electronic version of the manual, however, navigating the EWD is different than flipping the pages of a book Taking advantage of the computer’s capabilities, the EWD uses a “tree” on the left side of the screen for primary navigation To use the tree, simply click on any of the titles in the list The tree is arranged alphabetically in several levels The illustration shows where the index is found – in the “General” section under “Introduction.” On TIS, however, you would not use the index to find what you’re looking for You would use the tree Because of the different way of navigating the EWD on TIS, this section occasionally describes how you would find information using the tree on TIS Technical Training 51 Technician Handbook 652 Body Electrical Diagnosis EWD on TIS – 2006 MY and Later Beginning with 2006 model year vehicles, the interface for viewing the EWD on TIS is different The information on TIS is the same as in the paper EWD, but it is arranged very differently to take advantage of the computer’s power and convenience In this section, you will initially learn what information is available in the EWD and how to use it by primarily referring to the printed EWD manual, and possibly referring to TIS for pre-2006 vehicles Later in this section, you will learn how to access the same information using the EWD Viewer for 2006 MY and later vehicles 52 Technical Training Technician Handbook 652 Body Electrical Diagnosis “How to Use This Manual” The system circuit diagrams display most of the information about the circuit using symbols, abbreviations, and color coding To troubleshoot the circuit, you need to know how to read these symbols and codes You will find a detailed explanation of the symbols and codes in the “How to Use This Manual” section of the EWD (the top half is illustrated above) Things to note on this page: B.  Relay blocks are noted by clear ovals with the number of the relay block inside C.  Parentheses by wires indicate model specific wiring E.  Wiring harness connectors are illustrated by clear rectangles with the name of the connector inside The arrows are on the male connector side J.  Junction blocks are shown as grey boxes with the connector number inside an oval and the terminal number next to the oval Technical Training 53 Technician Handbook 652 Body Electrical Diagnosis “How to Use This Manual” (cont.) The bottom half of the explanation for using the EWD is illustrated above Things to note on this page: H.  With shielded wires, not pierce or attempt to splice! J.  Terminal numbers are at the end of each wire, and the component’s connector name is next to the component name K.  Ground points are shown as triangles with the ground point name inside N.  Inner harness splice locations are always approximate 2006 and later EWDs not number or locate splices 54 Technical Training Technician Handbook 652 Body Electrical Diagnosis Troubleshooting Section The troubleshooting section provides basic information for: •  Checking voltage •  Checking continuity and resistance •  Finding a short circuit These skills are discussed in detail in this course Technical Training 55 Technician Handbook 652 Body Electrical Diagnosis Connector Repair Information 56 The Troubleshooting section of the EWD manual also contains information on how to disconnect and reconnect connectors as well as connector and terminal repair information Technical Training Technician Handbook 652 Body Electrical Diagnosis Junction Block Location in the EWD Viewer 102 To obtain information about a junction block in the EWD Viewer, click on the J/B in the system circuit diagram to highlight it Then look under the Location tab to see the J/B diagram When a “Location” button is available on this screen, it brings up the location diagram Technical Training Technician Handbook 652 Body Electrical Diagnosis J/B Inner Circuit Using EWD Viewer Diagrams of a J/B’s inner circuit are also provided Click on the “Inner Circuit” button to switch diagrams Use the “Part” and “Location” buttons to return to other views Technical Training 103 Technician Handbook 652 Body Electrical Diagnosis Harness Connectors in EWD Viewer 104 Finding information on harness connectors in the EWD Viewer is similar to finding information on other components Click on the connector in the system circuit diagram to highlight it, then look under the Location tab or Connector tab Technical Training Technician Handbook 652 Body Electrical Diagnosis For vehicles 2006 MY and later, the Troubleshooting section and connector repair information is under the Help tab in the EWD Viewer on TIS NOTES: Technical Training 105 Technician Handbook 652 Body Electrical Diagnosis In the EWD Viewer on TIS (2006 MY and later), additional wire harness repair information is under the Connector tab To see this information, you have to check the box for Display Wire Harness Repair Info NOTES: 106 Technical Training Technician Handbook 652 Body Electrical Diagnosis Splice Information for 2006 MY and Later Beginning with the 2006 model year, splice point locations in the vehicle are no longer provided in the printed EWD Splice points are still shown in the system circuit diagram, but the octagon symbol no longer has an ID for cross referencing to the location diagram Because splice point locations are not in the EWD, they are not in the EWD Viewer either Technical Training 107 Technician Handbook 652 Body Electrical Diagnosis Power Source System Diagram in EWD Viewer In the EWD Viewer, the Power Source System Diagram is included among the other system circuit diagrams Under the Navigation tab, select “Power Source/Networking” and “Power Source,” then look under the Diagram tab All the symbols, color-coding, and abbreviations in this diagram are the same as for other system circuit diagrams 108 Technical Training Technician Handbook 652 Body Electrical Diagnosis Power Source Tab in EWD Viewer To find circuits using the same fuse in EWD Viewer: •  First click on the fuse in the system circuit diagram This highlights the J/B or R/B containing the fuse •  Next, look under the Power Source tab The selected J/B or R/B will be highlighted •  From the list of fuses, select the one in which you’re interested A list of circuits using that fuse appears •  Select a circuit and return to the Diagram tab If no circuit is selected in the lower box, TIS will not display any diagram under the Diagram tab Technical Training 109 Technician Handbook 652 Body Electrical Diagnosis Ground Points in EWD Viewer 110 To find the location of ground points in the EWD viewer, click on the ground point symbol in the system circuit diagram to highlight it Then look under the Location tab Technical Training Technician Handbook 652 Body Electrical Diagnosis Shared Ground Points in EWD Viewer Finding shared ground points in the EWD Viewer is slightly different from previous procedures •  First, highlight the ground point in the system circuit diagram •  When the drop-down menu appears, use it to find other circuits that share the same ground point •  Select a circuit from the list to display its system circuit diagram The shared ground point will be highlighted This works for harness connectors, too Technical Training 111 Technician Handbook 652 Body Electrical Diagnosis Finding Additional Information When the System Outline is not available in the EWD, or when more detailed information is needed on circuit operation, check these other information sources available on TIS: •  Repair Manual •  New Car Features •  Owner’s Manual •  Technical Service Information Bulletins In this example, we are going to search the Repair Manual for information on a specific terminal of the Body ECU, terminal “ACTD.” 112 Technical Training Technician Handbook 652 Body Electrical Diagnosis We search the Repair Manual for the keyword “ACTD’” using our specific vehicle and year with the Service Category and Section set to “ALL.” This search leads us to the Door Lock Control System “Terminals of ECU” section NOTES: Technical Training 113 Technician Handbook 652 Body Electrical Diagnosis After selecting “Terminals of the ECU” perform a search (using the “Find” function) for the term “ACTD.” This matrix tells us that the “ACTD” terminal is the motor unlock drive for the Driver’s Door Lock, and that if we unlock the power door locks, it should go from volts to battery voltage momentarily NOTES: 114 Technical Training Technician Handbook 652 Body Electrical Diagnosis Other Sources of Information These other sections in the Repair Manual directly relate to the power door lock system: •  System description - power door lock control system •  How to proceed with troubleshooting - power door lock control system •  Operation check - power door lock control system •  Customize parameters - power door lock control system •  Problem symptoms table - power door lock control system •  Terminals of ECU - power door lock control system •  Diagnosis system - power door lock control system Technical Training 115 Technician Handbook 652 Body Electrical Diagnosis Use this space to write down any questions you may have for your instructor NOTES: 116 Technical Training ...Technician Handbook 652 Body Electrical Diagnosis The Electrical Wiring Diagram The Toyota Electrical Wiring Diagram (EWD) is the roadmap to all the electrical components and wiring in Toyota vehicles... Handbook 652 Body Electrical Diagnosis Use this space to write down any questions you may have for your instructor NOTES: 62 Technical Training Technician Handbook 652 Body Electrical Diagnosis. .. of the component affecting the circuit 60 Technical Training Technician Handbook 652 Body Electrical Diagnosis Gang-type Switches Technical Training Look closely at components with multiple switches