VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1249/49

DTC Code DTC Name
C1249/49 Open in Stop Light Switch Circuit

DESCRIPTION

The skid control ECU (housed in the brake actuator assembly) receives the stop light switch signal and determines the condition of brake operation.

The skid control ECU has an open detection circuit which stores this DTC when detecting an open in the stop light input line or the ground line of the stop light circuit with the stop light switch off (brake pedal not depressed).

DTC Code DTC Detection Condition Trouble Area
C1249/49 Stop light switch circuit malfunction.

  • STOP fuse

  • Stop light switch

  • Stop light switch circuit

  • Stop light control relay

  • Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM

A003EMME03

INSPECTION PROCEDURE

Note


  • When replacing the skid control ECU (brake actuator assembly), perform the engine variant learning Click here.

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

PROCEDURE


  1. CHECK STOP LIGHT OPERATION


    1. Check that the stop lights come on when the brake pedal is depressed, and go off when the brake pedal is released.

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

    NG

    INSPECT STOP LIGHT SWITCH Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (STP TERMINAL)


    1. Disconnect the skid control ECU connector.

    2. A003CIYE12
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A42-30 (STP) - Body ground Stop light switch on (Brake pedal depressed) 8 to 14 V
      Stop light switch off (Brake pedal released) Below 1.5 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (STP2 TERMINAL)


    1. Disconnect the skid control ECU connector.

    2. A003CIYE13
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A42-13 (STP2) - Body ground Stop light switch on (Brake pedal depressed) 8 to 14 V
      Stop light switch off (Brake pedal released) Below 1.5 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Start the engine.

    3. Depress the brake pedal several times to test the stop light circuit.

    4. Check if the same DTC is output Click here.

      Result
      Result Proceed to
      DTC C1249/49 is output. A
      DTC C1249/49 is not output. B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  5. INSPECT STOP LIGHT SWITCH


    1. Remove the stop light switch Click here.

    2. A003EK9E01

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 - 2 Switch pin free Below 1 Ω
      Switch pin pushed in 10 kΩ or higher

    NG

    REPLACE STOP LIGHT SWITCH Click here

    OK

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


    1. A006TZRE05
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Stop Light Switch)

      Disconnect the A1 stop light switch connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A1-2 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL RELAY - BATTERY)


    1. A006VB8E04
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Stop Light Control Relay)

      Disconnect the A12 stop light control relay connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A12-5 (STP) - Body ground Brake pedal depressed 11 to 14 V
      A12-5 (STP) - Body ground Brake pedal released Below 1 V
      A12-6 (+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
      A12-8 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL RELAY - REAR COMBINATION LIGHT AND CENTER STOP LIGHT)


    1. Disconnect the skid control ECU connector.

    2. Disconnect the stop light control relay connector.

    3. Rear Combination Light:


      1. Disconnect the rear combination light connector.

      2. A003AGGE01
        Text in Illustration
        *1

        Front view of wire harness connector

        (to Stop Light Control Relay)
        *2

        Front view of wire harness connector

        (to Rear Combination Light)
        *3 for LH
        *4 for RH
        *5

        Front view of wire harness connector

        (to Center Stop Light [for Sedan])
        *6

        Front view of wire harness connector

        (to Center Stop Light [for Wagon])

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

        Standard Resistance
        for LH
        Tester Connection Condition Specified Condition
        A12-1 (OUT) - G6-2 (B) Always Below 1 Ω
        G6-4 (E) - Body ground Always Below 1 Ω
        G6-2 (B) - Body ground Always 10 kΩ or higher
        for RH
        Tester Connection Condition Specified Condition
        A12-1 (OUT) - G5-2 (B) Always Below 1 Ω
        G5-4 (E) - Body ground Always Below 1 Ω
        G5-2 (B) - Body ground Always 10 kΩ or higher

    4. Center Stop Light:


      1. Disconnect the center stop light connector.

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

        Standard Resistance
        for Sedan
        Tester Connection Condition Specified Condition
        A12-1 (OUT) - z13-1 (B) Always Below 1 Ω
        z13-2 (E) - Body ground Always Below 1 Ω
        z13-1 (B) - Body ground Always 10 kΩ or higher
        for Wagon
        Tester Connection Condition Specified Condition
        A12-1 (OUT) - z14-1 (B2) Always Below 1 Ω
        z14-2 (E2) - Body ground Always Below 1 Ω
        z14-1 (B2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - STOP LIGHT CONTROL RELAY)


    1. Disconnect the skid control ECU connector.

    2. Disconnect the stop light control relay connector.

    3. A003BC5E02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)
      *2

      Front view of wire harness connector

      (to Stop Light Control Relay)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A42-13 (STP2) - A12-1 (OUT) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. REPLACE REPLACE STOP LIGHT CONTROL RELAY ASSEMBLY


    1. Replace the stop light control relay assembly (for LHD: Click here, for RHD: Click here.


    NEXT

  11. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Start the engine.

    3. Depress the brake pedal several times to test the stop light circuit.

    4. Check if the same DTC is output Click here.

      Result
      Result Proceed to
      DTC C1249/49 is output. A
      DTC C1249/49 is not output. B

    B

    END

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here