ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1249/49

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

DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) receives the stop light switch assembly signal and detects the brake pedal operation status.

The skid control ECU (brake booster with master cylinder assembly) has an open detection circuit, which stores this DTC if it detects an open in the stop light input line or ground line of the stop light circuit with the stop light switch assembly off (brake pedal not depressed).

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

Note

C1249/49

Open in Stop Light Switch Circuit

231

When IG1 terminal voltage is 9.5 V or more, an open stop light switch circuit continues for 10 seconds or more.

  • Harness or connector

  • Stop light switch assembly

  • Skid control ECU (Brake booster with master cylinder assembly)

Electronically controlled brake system DTC

WIRING DIAGRAM

Figure 1. for LHD:
C341468E05
Figure 2. for RHD:
C345751E03

CAUTION / NOTICE / HINT

Note:

  • When replacing the skid control ECU (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve.

    Click here

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

PROCEDURE

  1. CHECK STOP LIGHT OPERATION

    1. Check that all 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

    Result

    Proceed to

    OK

    NG
    NG

    INSPECT STOP LIGHT SWITCH ASSEMBLYClick here

    OK

  2. READ VALUE USING GTS (STOP LIGHT SWITCH ASSEMBLY)

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the Data List on the GTS.

      Click here

      Chassis > ABS/VSC/TRC > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      Stop Light SW

      Stop light switch assembly

      ON or OFF

      ON: Brake pedal depressed

      OFF: Brake pedal released

      -

      Chassis > ABS/VSC/TRC > Data List

      Tester Display

      Stop Light SW

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

      OK

      The GTS displays ON or OFF according to brake pedal operation.

    Result

    Proceed to

    OK

    NG
    NG

    CHECK HARNESS AND CONNECTOR (STP TERMINAL)Click here

    OK

  3. RECONFIRM DTC

    1. Clear the DTCs.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the power switch off.

    3. Turn the power switch on (READY).

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

    5. Check if the same DTC is output.

      Click here

      Chassis > ABS/VSC/TRC > Trouble Codes

      Result

      Result

      Proceed to

      DTC C1249/49 is not output.

      A

      DTC C1249/49 is output.

      B
      Tip:

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

      Click here

    A

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick here

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

    for LHD:Click here

    for RHD:Click here

  4. CHECK HARNESS AND CONNECTOR (STP TERMINAL)

    1. C316493C30

      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Turn the power switch off.

    2. Make sure that there is no looseness at the locking part and the connecting part of the connector.

    3. Disconnect the A110 skid control ECU (brake booster with master cylinder assembly) connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A110-33 (STP) - Body ground

      Stop light switch assembly on (Brake pedal depressed)

      11 to 14 V

      Stop light switch assembly off (Brake pedal released)

      Below 1.5 V

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

    for LHD:Click here

    for RHD:Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)

  5. INSPECT STOP LIGHT SWITCH ASSEMBLY

    1. Check the stop light switch assembly.

      Click here

      OK

      The stop light switch assembly is normal.

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY

    Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (STP TERMINAL)

    1. C316493C30

      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Make sure that there is no looseness at the locking part and the connecting part of the connector.

    2. Disconnect the A110 skid control ECU (brake booster with master cylinder assembly) connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A110-33 (STP) - Body ground

      Stop light switch assembly on (Brake pedal depressed)

      11 to 14 V

      Stop light switch assembly off (Brake pedal released)

      Below 1.5 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)

    OK

  7. RECONFIRM DTC

    1. Reconnect the A110 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Clear the DTCs.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the power switch off.

    4. Turn the power switch on (READY).

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

    6. Check if the same DTC is output.

      Click here

      Chassis > ABS/VSC/TRC > Trouble Codes

      Result

      Result

      Proceed to

      DTC C1249/49 is not output.

      A

      DTC C1249/49 is output.

      B
      Tip:

      If the lighting system is normal but the DTC is still output, replace the skid control ECU (brake booster with master cylinder assembly).

      for LHD:Click here

      for RHD:Click here

    A

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick here

    B

    INSPECT LIGHTING SYSTEM

    Click here