LIGHTING SYSTEM Stop Light Circuit

DESCRIPTION

When the stop light switch is turned on, current flows to the stop lights to illuminate them. During emergency braking, the brake control system blinks all stop lights to alert following drivers and reduces the possibility of a rear-end collision.

WIRING DIAGRAM

A01DUSLE01
A01DRM1E01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC (BRAKE CONTROL SYSTEM)


    1. Clear the DTCs Click here for 5L-E, Click here for 1GR-FE, 1KD-FTV, Click here for 2TR-FE).

    2. Check for DTCs Click here for 5L-E, Click here for 1GR-FE, 1KD-FTV, Click here for 2TR-FE).

      OK
      DTC output does not occur.
      Result
      Result Proceed to
      OK A
      NG (for 5L-E) B
      NG (for 1GR-FE, 1KD-FTV) C
      NG (for 2TR-FE) D

    B

    GO TO ANTI-LOCK BRAKE SYSTEM Click here

    C

    GO TO VEHICLE STABILITY CONTROL SYSTEM (for Hydraulic Brake Booster) Click here

    D

    GO TO VEHICLE STABILITY CONTROL SYSTEM (for Vacuum Brake Booster) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BATTERY)

    A01DLT6E01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Stop Light Control ECU Assembly)

    1. Disconnect the A85 stop light switch connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A85-1(B) - Body ground Always 11 to 14 V

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A85-3(GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK STOP LIGHT SWITCH ASSEMBLY


    1. Temporarily replace the stop light switch with a new or normally functioning one Click here.

    2. Check the stop light operation.

      OK
      Stop light operation is normal.

    NG

    CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL ECU ASSEMBLY - BATTERY AND BODY GROUND) Click here

    OK

    END (STOP LIGHT SWITCH IS DEFECTIVE)

  4. CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL ECU ASSEMBLY - BATTERY AND BODY GROUND)


    1. A01DU6TE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Stop Light Control ECU Assembly)

      Disconnect the A54 stop light control ECU connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A54-5 (STP) - Body ground Brake pedal depressed 11 to 14 V
      A54-5 (STP) - Body ground Brake pedal released Below 1 V
      A54-6 (+B) - Body ground Always 11 to 14 V

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A54-8 (GND) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK (Problem is that lights are flashing) (except 5L-E) A
      OK (Problem is that lights do not turn on or stay on) B
      NG C

    B

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  5. CHECK STOP LIGHT


    1. With the skid control ECU connector disconnected, check the illumination of the stop lights when depressing the brake pedal.

      OK
      Stop lights operate normally when the brake pedal is depressed.

    NG

    REPLACE STOP LIGHT CONTROL ECU ASSEMBLY Click here

    OK

    REPLACE SKID CONTROL ECU Click here