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

B002DSCE03

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK FOR DTC (VEHICLE STABILITY CONTROL SYSTEM)


    1. Check for DTCs.

      Click here

      OK
      DTC output does not occur.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO VEHICLE STABILITY CONTROL SYSTEM Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - BATTERY AND BODY GROUND)


    1. B002DFWC12
      *a

      Front view of wire harness connector

      (to No. 2 Integration Relay)

      Disconnect the No. 2 integration relay connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      2G-1 (ALT) - Body ground Always 11 to 14 V
      2B-7 (BATT) - Body ground
      2B-8 (IG1A) - Body ground Engine switch on (IG)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2B-10 (GNDB) - Body ground Always Below 1 Ω
      2A-22 (GNDA) - Body ground
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - BATTERY AND BODY GROUND)


    1. B002EQUC04
      *a

      Front view of wire harness connector

      (to Stop Light Switch Assembly)

      Disconnect the stop light switch connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A3-1 (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
      A3-3 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - NO. 2 INTEGRATION RELAY)


    1. Disconnect the A3 stop light switch connector.

    2. Disconnect the 2A No. 2 integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A3-2 (L) - 2A-11 (STPO) Always Below 1 Ω
      A3-2 (L) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK STOP LIGHT SWITCH ASSEMBLY


    1. B002CC9C18
      *a

      Component with harness connected

      (Stop Light Switch Assembly)

      Disconnect the 2A No. 2 integration relay connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A3-2 (L) - Body ground Brake pedal depressed 11 to 14 V
      Brake pedal released Below 1 V
      Result
      Result Proceed to
      OK (Problem is that lights are flashing) 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

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    A

  6. CHECK STOP LIGHT OPERATION


    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.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) for LHD: Click here
    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) for RHD: Click here

    NG

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