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Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Turn the engine switch off before measuring the resistance of CAN bus main wires and CAN bus branch wires.
  • After the engine switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the engine switch, any other switches, or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

HINT

Operating the engine switch, any switches, or any doors triggers related ECU and sensor communication with the CAN This communication will cause the resistance value to change

  1. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE 
    1. Confirm the systems (ECUs and sensors), which use CAN communication, equipped on the vehicle (See DIAGNOSIS SYSTEM  )
    2. Using the Techstream, select and perform "CAN Bus Check" (See DIAGNOSIS SYSTEM  )
    3. Observe the screen for approximately 1 minute to check the ECUs and sensors that are not displayed on the screen and also those that repeatedly appear and disappear from the screen
    4. Disconnect the branch line connectors, which are connected to the ECUs or sensors that are not displayed on the screen, from the CAN junction connector
      Fig 1: CAN Junction Connector Diagram
      G05754118Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 2: CAN LH Junction Connector Diagram
      G05754205Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Wiring Color 

      WIRING COLOR SPECIFICATION

      CAN LH Junction Connector A Side (w/ Earth Terminal) Code Color (CANH Side) Color (CANL Side)
      Steering angle sensor J1 P W
      ECM J2 B W
      Seat belt control ECU J3 V W
      Center airbag sensor J4 R W

      Wiring Color 

      WIRING COLOR SPECIFICATION

      CAN LH Junction Connector B Side (w/ot Earth Terminal) Code Color (CANH Side) Color (CANL Side)
      Yaw rate sensor J5 P W
      CAN main bus line (bus line connecting CAN LH junction connector and CAN RH junction connector) J7 B W
      DLC3 J8 G W
      Distance control ECU J9 GR W
      Fig 3: CAN RH Junction Connector Diagram
      G05754116Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Wiring Color 

      WIRING COLOR SPECIFICATION

      CAN RH Junction Connector A Side (w/ Earth Terminal) Code Color (CANH Side) Color (CANL Side)
      CAN main bus line (bus line connecting CAN RH junction connector and CAN LH junction connector) J81 B W
      Power steering ECU J82 P W
      Skid control ECU J83 R W

      Wiring Color 

      WIRING COLOR SPECIFICATION

      CAN RH Junction Connector B Side (w/o Earth Terminal) Code Color (CANH Side) Color (CANL Side)
      Gateway ECU J84 B W

      HINT

      • Connecting locations of the connectors shown in the above tables are those of a vehicle whose connector locations have never been changed
      • If the connector locations differ from those shown in the above tables, identify each connector according to the color of the bus lines.
    5. Check that the ECUs and sensors, which repeatedly appeared and disappeared from the "CAN Bus Check" screen, are constantly displayed
    6. Perform the communication stop mode check for the ECUs and sensors which correspond to the disconnected branch line connectors (See PROBLEM SYMPTOMS TABLE  ).

    NEXT: GO TO CORRESPONDING COMMUNICATION STOP MODE 

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