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Back-up Light Circuit: Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Select the ACTIVE TEST, use the Techstream to generate a control command, and then check that the back-up light illuminates.
      BODY NO. 4 (MULTIPLEX NETWORK REAR ECU)

      Item Test Details Diagnostic Note
      Back up Light Back-up light ON / OFF -

      OK

      Back-up light illuminates.

    OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

    NG: Go to next step 

  2. READ VALUE USING TECHSTREAM 
    1. Check the DATA LIST for proper functioning of the park / neutral position switch.
      BODY NO. 4 (MULTIPLEX NETWORK REAR ECU)

      Item Measurement Item / Display (Range) Normal Condition Diagnostic Note
      Reverse Signal Control Transmission position R signal / ON or OFF ON: Shift position is R
      OFF: Shift position is not R      		 -

    OK → See step   3 

    NG → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

  3. REPLACE BACK-UP LIGHT BULB 
    1. Temporarily replace the back-up light bulb with a new or normally functioning one.
    2. Check that light bulb illuminates.

      OK

      Back-up light bulb illuminates.

    OK → END 

    NG: Go to next step 

  4. CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - REAR COMBINATION LIGHT (BACK-UP LH OR BACK-UP RH) - BODY GROUND) 
    1. Check the wire harness between the rear combination light (back-up LH) and No. 1 junction block, and the rear combination light (back-up LH) and body ground.
      Fig 1: Identifying Y2 Light Connector And LA Junction Block Connector
      GTY108208Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the Y2 light connector.
      2. Disconnect the LA junction block connector.
      3. Measure the resistance of the wire harness side connectors.

        Standard resistance

        Tester Connection Specified Condition
        LA-2 (BCK1) - Y2-1 Below 1 Ω
        LA-2 (BCK1) or Y2-1 - Body ground 10 kΩ or higher
      4. Connect the LA junction block connector.
      5. Measure the resistance of the wire harness side connector.

        Standard resistance

        Tester Connection Specified Condition
        Y2-4 - Body ground Below 1 Ω
    2. Check the wire harness between the rear combination light (back-up RH) and No. 1 junction block, and the rear combination light (back-up RH) and body ground.
      Fig 2: Identifying Y9 Light Connector And LA Junction Block Connector
      GTY100338Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the Y9 light connector.
      2. Disconnect the LA junction block connector.
      3. Measure the resistance of the wire harness side connectors.

        Standard resistance

        Tester Connection Specified Condition
        LA-2 (BCK1) - Y9-1 Below 1 Ω
        LA-2 (BCK1) or Y9-1 - Body ground 10 kΩ or higher
      4. Connect the LA junction block connector.
      5. Measure the resistance of the wire harness side connector.

        Standard resistance

        Tester Connection Specified Condition
        Y9-4 - Body ground Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

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