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

A01FT5DE03

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK FOR DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)


    1. Check for DTCs Click here.

      OK
      DTC output does not occur.

    NG

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    OK

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


    1. A01FQ6CE06
      Text in Illustration
      *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 Condition Specified Condition
      1G-1 (ALT) - Body ground Always 11 to 14 V
      1B-7 (BATT) - Body ground
      1B-8 (IG1A) - Body ground Power switch on (IG)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1B-10 (GNDB) - Body ground Always Below 1 Ω
      1A-22 (GNDA) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01FVIOE02
      Text in Illustration
      *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 Condition Specified Condition
      A5-1 (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
      A5-3 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the A5 stop light switch connector.

    2. Disconnect the 1A 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
      A5-2 (L) - 1A-11 (STPO) Always Below 1 Ω
      A5-2 (L) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK STOP LIGHT SWITCH


    1. A01FRRVE02
      Text in Illustration
      *a

      Component with harness connected

      (Stop Light Switch Assembly)

      Disconnect the 1A No. 2 integration relay connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A5-2 (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.

    NG

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

    OK

    REPLACE SKID CONTROL ECU ASSEMBLY Click here