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Stop Light Circuit: Procedure

  1. READ VALUE USING TECHSTREAM 
    1. Select the DATA LIST, use the Techstream to generate a control command, and then check that the stop light illuminates.
      BODY NO. 4 (MULTIPLEX NETWORK REAR ECU)

      Item Measurement Item / Display (Range) Normal Condition Diagnostic Note
      Stop Light SW Stop light switch / ON or OFF ON: Brake pedal depressed
      OFF: Brake pedal released      		 -

      OK

      Each light illuminates.

    OK → See step   5 

    NG: Go to next step 

  2. INSPECT FUSE (STOP SW) 
    1. Remove the STOP SW fuse from the cowl side junction block RH.
    2. Measure the resistance of the fuse.

      Standard resistance

      Below 1 Ω

    NG → REPLACE FUSE 

    OK: Go to next step 

  3. INSPECT STOP LIGHT SWITCH 

    Inspection. Refer to INSPECTION

    OK

    Stop light switch is normal.

    NG → REPLACE STOP LIGHT SWITCH 

    OK: Go to next step 

  4. CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - BATTERY) 
    1. Disconnect the LC junction block connector.
      Fig 1: Identifying LC Junction Block Connector Terminals
      GTY108227Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage of the wire harness side connector.

      Standard voltage

      Tester Connection Condition Specified Condition
      LC-32 (STP1) - Body ground Brake pedal is depressed 10 to 14 V

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

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

      Item Test Details Diagnostic Note
      Stop Light Stop light ON / OFF -
      High Mount Stop Light High mount stop light ON / OFF -

      Result

      Result Proceed to
      OK A
      Both do not illuminate B
      Combination light (stop light LH or RH) does not illuminate C
      High mount stop light does not illuminate D

    D → See step   10 

    C → See step   8 

    B → See step   6 

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

  6. INSPECT FUSE (STOP LP L, STOP LP R) 
    1. Remove the STOP LP L fuse from the No. 1 junction block.
    2. Remove the STOP LP R fuse from the No. 1 junction block.
    3. Measure the resistance of the fuses.

      Standard resistance

      Below 1 Ω

    NG → REPLACE FUSE 

    OK: Go to next step 

  7. CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - BATTERY) 
    1. Disconnect the LB junction block connector.
      Fig 2: Identifying LB Junction Block Connector
      GTY103576Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage of the wire harness side connector.

      Standard voltage

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

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

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

  8. CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - LIGHT (STOP LH OR STOP RH) - BODY GROUND) 
    1. Check the wire harness between the rear combination light (stop LH) and No. 1 junction block, and the rear combination light (stop LH) and body ground.
      Fig 3: Identifying No. 1 Junction Block - Light (Stop LH) Connector Terminals
      GTY108204Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the LG junction block connector.
      2. Disconnect the X1 light connector.
      3. Measure the resistance of the wire harness side connectors.

        Standard resistance

        Tester Connection Specified Condition
        LG-7 (STP2) - X1-7 (STP) Below 1 Ω
        LG-7 (STP2) or X1-7 (STP) - 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 (stop RH) and No. 1 junction block, and the rear combination light (stop RH) and body ground.
      Fig 4: Identifying Rear Combination Light (Stop RH) And Junction Block Assembly Connector Terminals
      GTY108205Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the LG junction block connector.
      2. Disconnect the X3 light connector.
      3. Measure the resistance of the wire harness side connectors.

        Standard resistance

        Tester Connection Specified Condition
        LG-2 (STP3) - X3-2 (STP) Below 1 Ω
        LG-2 (STP3) or X3-2 (STP) - 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 

  9. REPLACE REAR COMBINATION LIGHT (STOP LH OR STOP RH) 
    1. Temporarily replace the rear combination light (stop LH or stop RH) 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 

  10. REPLACE NOISE FILTER 
    1. Temporarily replace the noise filter with a new or normally functioning one.
    2. Check that the light illuminates.

      OK

      Light illuminates.

    OK → END 

    NG: Go to next step 

  11. REPLACE CENTER STOP LIGHT 
    1. Temporarily replace the center stop light with a new or normally functioning one.
    2. Check that the light illuminates.

      OK

      Light illuminates.

    OK → END 

    NG: Go to next step 

  12. CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - NOISE FILTER) 
    1. Disconnect the LA junction block connector.
      Fig 5: Identifying No. 1 Junction Block - Noise Filter Connector Terminals
      GTY108304Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the V18 noise filter connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance

      Tester Connection Specified Condition
      LA-4 (STP1) - V18-2 Below 1 Ω
      LA-4 (STP1) or V18-2 - Body ground 10kΩ or higher

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  13. CHECK WIRE HARNESS (NOISE FILTER - CENTER STOP LIGHT) 
    1. Disconnect the V18 noise filter connector.
      Fig 6: Identifying Noise Filter - Center Stop Light Connector Terminals
      GTY102937Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the V24 light connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance

      Tester Connection Specified Condition
      V18-1 - V24-1 Below 1Ω
      V18-1 or V24-1 - Body ground 10kΩ or higher

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  14. CHECK WIRE HARNESS (CENTER STOP LIGHT - BODY GROUND) 
    1. Disconnect the V24 light connector.
      Fig 7: Identifying Center Stop Light Connector Terminals
      GTY108305Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance of the wire harness side connector.

      Standard resistance

      Tester Connection Specified Condition
      V24-2 - Body ground Below 1Ω

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

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

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