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Taillight Circuit: Procedure

  1. CHECK OPERATION OF FRONT LIGHT OR REAR LIGHT 
    1. When the taillight switch is operated, check that the following lights illuminate.

      Result

      Result Proceed to
      Front lights do not illuminate A
      Rear lights do not illuminate B

    B → See step   7 

    A: Go to next step 

  2. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Select the ACTIVE TEST, use the Techstream to generate a control command, and then check that the clearance light illuminates.
      BODY NO. 5 (FRONT CONTROLLER)

      Item Test Details Diagnostic Note
      Clearance Light Operation Clearance light ON / OFF -

      OK

      Light illuminates.

    NG → See step   3 

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

  3. INSPECT FUSE (FR TAIL, FR CTRL-AM) 
    1. Remove the FR CTRL-AM fuse from the engine room No. 2 relay block.
    2. Remove the FR TAIL fuse from the engine room No. 2 junction block.
    3. Measure the resistance of the fuses.

      Standard resistance

      Below 1 Ω

    NG → REPLACE FUSE 

    OK: Go to next step 

  4. REPLACE CLEARANCE LIGHT BULB (LH OR RH) 
    1. Temporarily replace the clearance light bulb (LH or RH) with a new or normally functioning one.
    2. Check that the bulb illuminates.

      OK

      Clearance light bulb illuminates.

    OK → END 

    NG: Go to next step 

  5. CHECK WIRE HARNESS (ENGINE ROOM NO. 2 JUNCTION BLOCK - BATTERY) 
    1. Disconnect the 2E junction block connector.
      Fig 1: Checking Wire Harness (Engine Room No. 2 Junction Block - Battery)
      GTY108195Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage of the wire harness side connector.

      Standard voltage

      Tester Connection Specified Condition
      2E-1 - Body ground 10 to 14 V

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  6. CHECK WIRE HARNESS (ENGINE ROOM NO. 2 JUNCTION BLOCK - BODY GROUND) 
    1. Check the wire harness between the headlight (clearance LH) and engine room No. 2 junction block, and the headlight (clearance LH) and body ground.
      Fig 2: Identifying Headlight (Clearance LH) And Engine Room No. 2 Junction Block Connector Terminals
      GTY103390Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the 2G junction block connector.
      2. Disconnect the B11 headlight connector.
      3. Measure the resistance of the wire harness side connectors.

        Standard resistance

        Tester Connection Specified Condition
        2G-9 - B11-7 (B) Below 1 Ω
        2G-9 or B11-7 (B) - Body ground 10 kΩ or higher
        B11-6 (E) - Body ground Below 1 Ω
    2. Check the wire harness between the headlight (clearance RH) and engine room No. 2 junction block, and the headlight (clearance RH) and body ground.
      Fig 3: Identifying Headlight (Clearance RH) And Engine Room No. 2 Junction Block Connector Terminals
      GTY108331Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the 2G junction block connector.
      2. Disconnect the B2 headlight connector.
      3. Measure the resistance of the wire harness side connectors.

        Standard resistance

        Tester Connection Specified Condition
        2G-8 - B2-7 (B) Below 1 Ω
        2G-8 or B2-7 (B) - Body ground 10 kΩ or higher
        B2-6 (E) - Body ground Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

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

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

      Item Test Details Diagnostic Note
      Tail Light Taillight ON / OFF -
      License Light License light ON / OFF -

      OK

      Light illuminates.

      Result

      Result Proceed to
      OK A
      All lights do not illuminate B
      Taillights (inner LH or inner RH) do not illuminate C
      Taillights (outer LH or outer RH) do not illuminate D
      License plate light does not illuminate E

    E → See step   14 

    D → See step   12 

    C → See step   10 

    B → See step   8 

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

  8. INSPECT FUSE (RR TAIL) 
    1. Remove the RR TAIL fuse from the No. 1 junction block assembly.
    2. Measure the resistance of the fuse.

      Standard resistance

      Below 1 Ω

    NG → REPLACE FUSE 

    OK: Go to next step 

  9. CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - BATTERY) 
    1. Disconnect the LB junction block connector.
      Fig 4: Identifying No. 1 Junction Block Assembly Connector Terminals
      GTY100393Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the LF junction block connector.
    3. Measure the voltage of the wire harness side connectors.

      Standard voltage

      Tester Connection Specified Condition
      LB-1 (TLIN) - LF-1 (PGND) 10 to 14 V
      LB-1 (TLIN) or LF-1 (PGND) - Body ground 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

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

  10. CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - LIGHT (TAIL INNER LH OR TAIL INNER RH) - BODY GROUND) 
    1. Check the wire harness between the rear combination light (tail inner LH) and No. 1 junction block, and the rear combination light (tail inner LH) and body ground.
      Fig 5: Identifying No. 1 Junction Block Assembly And Rear Combination Light (Tail Light LH) Connector Terminals
      GTY108206Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the LA junction block connector.
      2. Disconnect the Y2 combination light connector.
      3. Measure the resistance of the wire harness side connectors.

        Standard resistance

        Tester Connection Specified Condition
        LA-8 (TIL2) - Y2-2 Below 1 Ω
        LA-8 (TIL2) or Y2-2 - 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 (tail inner RH) and No. 1 junction block, and the rear combination light (tail inner RH) and body ground.
      Fig 6: Identifying Rear Combination Light (Tail Inner RH) And No. 1 Junction Block Connector Terminals
      GTY108207Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the LA junction block connector.
      2. Disconnect the Y9 combination light connector.
      3. Measure the resistance of the wire harness side connectors.

        Standard resistance

        Tester Connection Specified Condition
        LA-22 (TIL1) - Y9-2 Below 1 Ω
        LA-22 (TIL1) or Y9-2 - 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: Go to next step 

  11. REPLACE REAR COMBINATION LIGHT (TAIL INNER LH OR TAIL INNER RH) 
    1. Temporarily replace the rear combination light (tail inner LH or tail inner RH) with a new or normally functioning one.
    2. Check that the rear combination light illuminates.

      OK

      Light illuminates.

    OK → END 

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

  12. CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - LIGHT (TAIL OUTER LH OR TAIL OUTER RH) - BODY GROUND) 
    1. Check the wire harness between the rear combination light (tail outer LH) and No. 1 junction block, and the rear combination light (tail outer LH) and body ground.
      Fig 7: Identifying Junction Block Assembly And Tail Outer LH Connector Terminals
      GTY108203Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the LG junction block connector.
      2. Disconnect the X1 combination light connector.
      3. Measure the resistance of the wire harness side connectors.

        Standard resistance

        Tester Connection Specified Condition
        LG-5 (TIL2) - X1-5 (TL) Below 1 Ω
        LG-5 (TIL2) or X1-5 (TL) - Body ground 10 kΩ or higher
      4. Connect the LG junction block connector.
      5. Measure the resistance of the wire harness side connector.

        Standard resistance

        Tester Connection Specified Condition
        X1-6 (E) - Body ground Below 1 Ω
    2. Check the wire harness between the rear combination light (tail outer RH) and No. 1 junction block, and the rear combination light (tail outer RH) and body ground.
      Fig 8: Identifying Rear Combination Light (Tail Outer RH) And No. 1 Junction Block Connector Terminals
      GTY108202Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the LG junction block connector.
      2. Disconnect the X3 combination light connector.
      3. Measure the resistance of the wire harness side connectors.

        Standard resistance

        Tester Connection Specified Condition
        LG-5 (TIL2) - X3-5 (TL) Below 1 Ω
        LG-5 (TIL2) or X3-5 (TL) - Body ground 10 kΩ or higher
      4. Connect the LG junction block connector.
      5. Measure the resistance of the wire harness side connector.

        Standard resistance

        Tester Connection Specified Condition
        X3-6 (E) - Body ground Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  13. REPLACE REAR COMBINATION LIGHT (TAIL OUTER LH OR TAIL OUTER RH) 
    1. Temporarily replace the rear combination light (tail outer LH or tail outer RH) with a new or normally functioning one.
    2. Check that the rear combination light illuminates.

      OK

      Light illuminates.

    OK → END 

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

  14. CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - LIGHT - BODY GROUND) 
    1. Disconnect the LA junction block connector.
      Fig 9: Identifying No. 1 Junction Block - Licence Plate Light Connector Terminals
      GTY108223Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the Y4 license light connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance

      Tester Connection Specified Condition
      LA-10 (LCE1) - Y4-1 Below 1 Ω
      LA-10 (LCE1) or Y4-1 - 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
      Y4-2 - Body ground Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  15. REPLACE LICENSE PLATE LIGHT 
    1. Temporarily replace the license plate light with a new or normally functioning one.
    2. Check that the light illuminates.

      OK

      Light illuminates.

    OK → END 

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

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