ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1249/58

DTC Code DTC Name
C1249/58 Open Circuit in Stop Light Switch Circuit

DESCRIPTION

The skid control ECU detects the brake operating conditions through a signal transmitted by the stop light switch. The skid control ECU incorporates an open circuit detection circuit. This DTC is set under either of the following conditions:


DTC No. DTC Detecting Conditions Trouble Areas
C1249/58 Stop light switch circuit open. (Stop light switch voltage between 40% and 70% of battery voltage when stop light switch off)

  • Stop light switch

  • Stop light switch circuit

WIRING DIAGRAM

A0136KKE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK STOP LIGHT SWITCH OPERATION


    1. Connect the intelligent tester II to the DLC3.

    2. Turn the ignition switch to the ON position.

    3. Turn the tester ON.

    4. Select the DATA LIST mode on the intelligent tester II.

      Select the following menu items: Chassis / ABS/VSC/TRC / Data List.

      Item Measurement Item : Range (Display) Normal Conditions
      Stop Light SW Stop light switch : ON or OFF

      ON: Brake pedal applied

      OFF: Brake pedal released

    5. Check that "Stop Light SW" turns ON and OFF when the brake pedal is depressed and released.

      OK
      "Stop Light SW" turns ON/OFF in accordance with operation of brake pedal.

    NG

    INSPECT FUSE (STOP) Click here

    OK

  2. CHECK SKID CONTROL ECU TERMINAL VOLTAGE (STP)


    1. Disconnect the skid control ECU connector.

    2. A0135VYE03

      Measure the voltage.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A21-20 (STP) - Body ground Brake pedal depressed 8 to 14 V
      A21-20 (STP) - Body ground Brake pedal released Below 4.0 V

    NG

    CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - STOP LIGHT SWITCH) Click here

    OK

    REPLACE BRAKE ACTUATOR

  3. INSPECT FUSE (STOP)


    1. A0136UWE01

      Remove the STOP fuse from the instrument panel J/B.

    2. Measure the resistance.

      Standard Resistance
      Below 1 Ω

    NG

    CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE

    OK

  4. INSPECT STOP LIGHT SWITCH ASSEMBLY

    A0138FUE01

    1. Disconnect the stop light switch connector.

    2. Measure the resistance.

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

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY

    OK

  5. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - STOP LIGHT SWITCH)


    1. Disconnect the skid control ECU connector and stop light switch connector.

    2. A0137MSE01

      Measure the resistance.

      Standard Resistance
      Tester Connection Specified Condition
      A21-20 (STP) - A17-1 Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  6. RECONFIRM DTC


    1. Clear the DTC Click here.

    2. Check if the same DTC is recorded.

      Result
      DTC (C1249/58) output A
      DTC not output B

    B

    END

    A

    REPLACE BRAKE ACTUATOR