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 receives the stop light switch assembly signal and detects the brake pedal operation status.

The skid control ECU 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. INF Code DTC Detection Condition Trouble Area
C1249/49 231 When IG1 terminal voltage is 9.5 V or more, an open stop light switch circuit continues for 10 seconds or more.

  • Wire harness or connector

  • Stop light switch assembly

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

WIRING DIAGRAM

A01HSZEE02

INSPECTION PROCEDURE

Note

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

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

    NG

    CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL) Click here

    OK

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


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the Data List on the Techstream Click here.

      ABS/VSC/TRAC
      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

      		 -

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

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

    NG

    CHECK HARNESS AND CONNECTOR (STP TERMINAL) Click here

    OK

  3. RECONFIRM DTC


    1. Turn the power switch off.

    2. Clear the DTCs Click here.

    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.

      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 Problem Symptoms Table, refer back to the table and proceed to the next step Click here.


    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


    1. A01HUGJE12
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Stop Light Switch Assembly)

      Check that the STOP (7.5 A) fuse is normal.

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

    3. Disconnect the stop light switch assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A33-2 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  5. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. A01HSSVE02
      Text in Illustration
      *a

      Component without harness connected

      (Stop Light Switch Assembly)

      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 ASSEMBLY Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (SWITCH INPUT)


    1. A01HTTJE01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 Stop Light Control Relay (STOP Relay)

      Reconnect the stop light switch assembly connector.

    2. Remove the stop light control relay (STOP relay).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Stop light control relay (STOP relay) terminal 4 - Body ground Stop light switch assembly ON (Brake pedal depressed) 11 to 14 V
      Stop light control relay (STOP relay) terminal 4 - Body ground Stop light switch assembly OFF (Brake pedal released) Below 1.5 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT STOP LIGHT CONTROL RELAY (STOP RELAY)


    1. A01HTS0E02
      Text in Illustration
      *1 Stop Light Control Relay (STOP Relay)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 4 Voltage is not applied between terminals 1 and 2 Below 1 Ω
      3 - 4 Voltage is applied between terminals 1 and 2 10 kΩ or higher

    NG

    REPLACE STOP LIGHT CONTROL RELAY (STOP RELAY)

    OK

  8. CHECK HARNESS AND CONNECTOR (STP TERMINAL)


    1. A01HUR5E40
      Text in Illustration
      *a

      Front view of wire harness connector

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

      Install the stop light control relay (STOP relay).

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

    3. Disconnect the 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
      A28-6 (STP2) - Body ground Stop light switch assembly ON (Brake pedal depressed) 11 to 14 V
      A28-6 (STP2) - Body ground Stop light switch assembly OFF (Brake pedal released) Below 1.5 V
      A28-33 (STP) - Body ground Stop light switch assembly ON (Brake pedal depressed) 11 to 14 V
      A28-33 (STP) - Body ground Stop light switch assembly OFF (Brake pedal released) Below 1.5 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)

    OK

  9. RECONFIRM DTC


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

    2. Clear the DTCs Click here.

    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.

      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 Problem Symptoms Table, refer back to the table and proceed to the next step Click here.

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


    B

    INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT) Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

  10. CHECK HARNESS AND CONNECTOR (STP TERMINAL)


    1. A01HV5JE95
      Text in Illustration
      *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 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
      A28-33 (STP) - Body ground Stop light switch assembly ON (Brake pedal depressed) 11 to 14 V
      A28-33 (STP) - Body ground Stop light switch assembly OFF (Brake pedal released) Below 1.5 V

      Tech Tips

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


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)

    OK

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here