ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1249/49

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

DESCRIPTION

This skid control ECU inputs the stop light switch signal and detects the status of brake operation.

The skid control ECU has an open detection circuit. If an open in the stop light switch input line or GND side stop light circuit is detected when the stop light switch is off, this DTC is output.

DTC No. DTC Detection Condition Trouble Area
C1249/49 With the IG1 terminal voltage 9.5 V or more, open in the stop light switch circuit continues for 0.3 seconds or more.
  • Stop light switch

  • Stop light switch circuit

  • Rear combination light (stop light) assembly

WIRING DIAGRAM

A01BAQYE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK STOP LIGHT SWITCH OPERATION


    1. Check that the stop light comes on when the brake pedal is depressed, and goes off when the brake pedal is released.

      OK
      Stop light switch function is normal.

      Tech Tips

      Check the stop light bulb as it may have burnt out.


    NG
    OK
  2. INSPECT SKID CONTROL ECU (STP TERMINAL VOLTAGE)


    1. A01BBRSE15

      Disconnect the skid control ECU connector.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      B19-10 (STP) - Body ground

      Stop light switch ON

      (Brake pedal depressed)

      8 to 16 V
      B19-10 (STP) - Body ground

      Stop light switch OFF

      (Brake pedal released)

      Below 1.5 V
      Result
      Condition Proceed to
      OK (When troubleshooting in accordance with the DTC CHART) A
      OK (When troubleshooting in accordance with the PROBLEM SYMPTOMS TABLE) B
      NG C

    B
    C
    A
  3. RECONFIRM DTC


    1. Clear the DTC Click here.

    2. Check that the same DTC is recorded Click here.

      Tech Tips

      Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

      Result
      Condition Proceed to
      DTC (C1249/49) is output A
      DTC (C1249/49) is not output B

    B
    A
  4. INSPECT STOP LIGHT SWITCH (POWER SOURCE TERMINAL VOLTAGE)


    1. A01BGN1E01

      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
      B2-2 - Body ground Always 10 to 14 V

    NG
    OK
  5. INSPECT STOP LIGHT SWITCH


    1. A01BDAOE01

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

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

    NG
    OK
  6. CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND STOP LIGHT SWITCH)


    1. A01BHLZE01

      Disconnect the skid control ECU connector.

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

      Standard resistance
      Tester Connection Specified Condition
      B19-10 (STP) - B2-1 Below 1 Ω
      B19-10 (STP) - Body ground 10 kΩ or higher

      Tech Tips


      • When troubleshooting in accordance with the DTC CHART, check DTCs before replacing the brake actuator assembly Click here.

      • When troubleshooting in accordance with the PROBLEM SYMPTOMS TABLE, be sure to follow the table before replacing the brake actuator assembly Click here.


    NG
    OK