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 the brake pedal.

The skid control ECU has an open detection circuit and 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 No. DTC Detection Condition Trouble Area
C1249/49 After the ignition switch is turned to ON, the STP terminal voltage of the ECU is 40% to 67% of its supplied voltage for 3 seconds.

  • STOP fuse

  • Stop light switch assembly

  • Stop light switch circuit

  • Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM

A01IP3YE03

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 Specified Condition
      Brake pedal depressed ON
      Brake pedal released OFF

    NG

    CHECK STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  2. READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SW)


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Select the Data List on the intelligent tester Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stop Light SW Stop light switch/ ON or OFF

      ON: Brake pedal depressed

      OFF: Brake pedal released

      		 -

    4. Check that the stop light switch display observed on the intelligent tester changes according to brake pedal operation.

      OK
      The intelligent tester displays ON or OFF according to brake pedal operation.

    NG

    CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU STP TERMINAL) Click here

    OK

  3. 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

  4. CHECK STOP LIGHT SWITCH ASSEMBLY


    1. Check the stop light switch assembly Click here.

      OK
      The stop light switch assembly is normal.

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU STP TERMINAL)


    1. A01ITVSE29
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU [Brake Actuator Assembly])
      *2 for AD Series Engine
      *3 for ZR Series Engine

      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
      A52 or A54-30 (STP) - Body ground Stop light switch on (Brake pedal depressed) 11 to 14 V
      Stop light switch off (Brake pedal released) Below 1.5 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here