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

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

DESCRIPTION

The skid control ECU inputs the stop light switch signal and the condition of brake operation.

The skid control ECU has an open detection circuit, which outputs this DTC when detecting an open in the stop light input line while the stop light switch is OFF.

DTC Code DTC Detection Condition Trouble Area
C1249/49 When IG1 terminal voltage is 20 to 32 V, an open circuit of the stop light switch continues for 0.3 seconds or more.

  • STOP fuse

  • Stop light switch

  • Stop light switch circuit

  • Skid control ECU

WIRING DIAGRAM

A01CH0GE01
A01CI9UE01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT STOP FUSE


    1. A01CHV0E03

      Remove the STOP fuse from the No. 2 relay block.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      STOP (7.5 A) fuse Always Below 1 Ω

    NG

    REPLACE STOP FUSE

    OK

  2. CHECK STOP LIGHT OPERATION


    1. Install the STOP fuse.

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

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

    NG

    INSPECT STOP LIGHT SWITCH (POWER SOURCE TERMINAL) Click here

    OK

  3. INSPECT SKID CONTROL ECU (STP TERMINAL)


    1. A01CIMFE02

      Disconnect the skid control ECU connector.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      S13-1 (STP) - Body ground Stop light switch ON (Brake pedal depressed) 16 to 32 V
      S13-1 (STP) - Body ground Stop light switch OFF (Brake pedal released) Below 3 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)

    OK

  4. INSPECT SKID CONTROL ECU (IG1 TERMINAL)


    1. A01CIMFE01

      Turn the ignition switch to the ON position.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      S13-7 (IG1) - Body ground Ignition switch ON 20 to 32 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

    OK

  5. INSPECT SKID CONTROL ECU (GND TERMINAL)


    1. A01CJEKE01

      Turn the ignition switch off.

    2. Disconnect the skid control ECU connectors.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S14-2 (GND1) - Body ground Always Below 1 Ω
      S14-3 (GND2) - Body ground Always Below 1 Ω
      S11-15 (GND3) - Body ground Always Below 1 Ω
      S11-14 (GND4) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

  6. RECONFIRM DTC


    1. Reconnect the skid control ECU connectors.

    2. Clear the DTC (See Pub. No. RM1008E, page 05-195).

    3. Start the engine.

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

    5. Check if the same DTC is recorded (See Pub. No. RM1008E, page 05-195).

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

      Tech Tips

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Click here.


    B

    REPLACE SKID CONTROL ECU

    A

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here

  7. INSPECT STOP LIGHT SWITCH (POWER SOURCE TERMINAL)


    1. A01CH2VE05

      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
      S15-2 - Body ground Always 20 to 32 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  8. INSPECT STOP LIGHT SWITCH


    1. A01CJ4ME01

      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
      1 - 2 Switch pin pushed in 10 kΩ or higher

    NG

    REPLACE STOP LIGHT SWITCH

    OK

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


    1. A01CGU3E01

      Disconnect the skid control ECU connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S13-1 (STP) - S15-1 Always Below 1 Ω
      S13-1 (STP) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. RECONFIRM DTC


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

    2. Clear the DTC (See Pub. No. RM1008E, page 05-195).

    3. Start the engine.

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

    5. Check if the same DTC is recorded (See Pub. No. RM1008E, page 05-195).

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

      Tech Tips

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Click here.


    B

    REPLACE SKID CONTROL ECU

    A

    INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT)