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Inspection Procedure

  1. CHECK STOP LIGHT SWITCH OPERATION 
    1. Check that the stop light comes on when the brake pedal is depressed and goes off when the brake pedal is released.

    OK 

    PEDAL CONDITION AND ILLUMINATION CONDITION

    Pedal Condition Illumination Condition
    Brake pedal depressed ON
    Brake pedal released OFF

    HINT:

    Check the stop light bulb as it may have burnt out.

    NG: Go to step   4 

    OK: Go to next step 

  2. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (STP TERMINAL) 
    1. Disconnect the skid control ECU connector.
    2. Measure the voltage according to the value(s) in the table below.

    Voltage 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Switch condition Specified Condition
    S1-27 (STP) - Body ground Brake pedal depressed 8 to 14 V
    S1-27 (STP) - Body ground Brake pedal released Below 1 V
    Fig 1: Identifying Skid Control ECU Connector Terminals
    G04090600Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    NG: Go to step 5 

    OK: Go to next step 

  3. RECONFIRM DTC 
    1. Clear the DTCs (See DIAGNOSTIC TROUBLE CODE CHART  ).
    2. Turn the ignition switch to the ON position.
    3. Are the same DTCs detected.

    Result 

    RESULT REFERENCE CHART

    Result Proceed to
    DTC is output A
    DTC is not output B
    NOTE: When replacing the ABS & TRACTION actuator assembly, perform zero point calibration (See CALIBRATION  ).

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

    A: REPLACE ABS AND TRACTION ACTUATOR 

  4. INSPECT STOP LIGHT SWITCH ASSEMBLY 
    1. Disconnect the stop light switch assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

    Resistance 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Switch condition Tester connection Specified condition
    Switch pin free 1 - 2 Below 1 Ω
    Switch pin pushed in 1 - 2 10 kΩ or higher
    Fig 2: Inspecting Stop Light Switch Assembly
    G04090601Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    NG: REPLACE STOP LIGHT SWITCH ASSEMBLY 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - SKID CONTROL ECU) 
    1. Disconnect the stop light switch connector and skid control ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

    Resistance 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Specified Condition
    S1-27 (STP) - S13-1 (STP) Below 1 Ω
    Fig 3: Identifying Stop Light Switch Connector Terminals
    G04090602Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    NOTE: When replacing the ABS & TRACTION actuator assembly, perform zero point calibration (See CALIBRATION  ).

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ABS AND TRACTION ACTUATOR 

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