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Home >> Lexus >> 2007 >> GS 430 >> Repair and Diagnosis >> Accessories & Equipment >> Headlights >> Lighting >> System Description >> Stop Light Circuit >> Inspection Procedure

Inspection Procedure

  1. READ VALUE OF INTELLIGENT TESTER 
    1. Select the DATA LIST, use the intelligent tester to generate a control command, and then check that the stop light illuminates.

      Multiplex network rear ECU 

      DATA LIST - 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:  Go to 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 

    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.
    2. Measure the voltage of the wire harness side connector.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      LC-32 (STP1) - Body ground Brake pedal is depressed 10 to 14 V
    Fig 1: Identifying LC Junction Block Connector Terminals
    G05298845Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  5. PERFORM ACTIVE TEST BY INTELLIGENT TESTER 
    1. Select the ACTIVE TEST, use the intelligent tester to generate a control command, and then check that the stop light illuminates.

    Multiplex network rear ECU 

    ACTIVE TEST DETAIL - MULTIPLEX NETWORK REAR ECU

    Item Test Details Diagnostic Note
    STOP LIGHT Stop light ON / OFF -
    H-M STOP LIGHT High mount stop light ON / OFF -

    Result 

    RESULT REFERENCE

    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

    B:  Go to step  6

    C:  Go to step  8

    D:  Go to step  10

    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.
    2. Measure the voltage of the wire harness side connector.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Specified Condition
      LB-1 - Body ground 10 to 14 V
    Fig 2: Identifying No. 1 Junction Block Connector Terminals
    G05298846Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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.
      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 

        RESISTANCE SPECIFICATION

        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 

        RESISTANCE SPECIFICATION

        Tester Connection Specified Condition
        X1-6 (E) - Body ground Below 1 Ω
      Fig 3: Identifying No. 1 Junction Block And Light (Stop LH) Connector Terminals
      G05298847Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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.
      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 

        RESISTANCE SPECIFICATION

        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 

        RESISTANCE SPECIFICATION

        Tester Connection Specified Condition
        X3-6 (E) - Body ground Below 1 Ω
    Fig 4: Identifying Rear Combination Light (Stop RH) And Junction Block Assembly Connector Terminals
    G05298848Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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.
    2. Disconnect the V18 noise filter connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      LA-4 (STP1) - V18-2 Below 1 Ω
      LA-4 (STP1) or V18-2 - Body ground 10 kΩ or higher
    Fig 5: Identifying No. 1 Junction Block And Noise Filter Connector Terminals
    G05298849Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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.
    2. Disconnect the V24 light connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      V18-1 - V24-1 Below 1 Ω
      V18-1 or V24-1 - Body ground 10 kΩ or higher
    Fig 6: Identifying Noise Filter And Center Stop Light Connector Terminals
    G05298850Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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.
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      V24-2 - Body ground Below 1 Ω
    Fig 7: Identifying Center Stop Light Connector Terminals
    G05298851Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

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

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