VEHICLE STABILITY CONTROL SYSTEM(for TMMF Made), Diagnostic DTC:C1249

DTC Code DTC Name
C1249 Open in Stop Light Switch Circuit

DESCRIPTION

The skid control ECU (brake actuator assembly) detects the brake operating conditions through a signal transmitted by the stop light switch. The skid control ECU (brake actuator assembly) incorporates an open circuit detection circuit.

DTC No. DTC Detection Condition Trouble Area
C1249

When either of following (1 or 2) detected:


  1. Vehicle driven at 20 km/h (12 mph) or more for 6 minutes or more with stop light switch signal on

  2. During deceleration from 40 km/h (24 mph) to 3 km/h (2 mph), no change occurs in the stop light switch signal 4 times

  • Stop light switch assembly

  • Stop light switch circuit

  • Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM

B0047NSE04
B0047UVE04

CAUTION / NOTICE / HINT

Note


  • When replacing the brake actuator assembly, perform zero point calibration Click here.

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

PROCEDURE


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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menu: Chassis / ABS/VSC/TRC / Data List.

    5. According to the display on the tester, read the Data List.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stop Light SW

      Stop light switch:

      OFF or ON

      OFF: Brake pedal released

      ON: Brake pedal applied

      		 -

    6. Check that "Stop Light SW" turns ON and OFF when the brake pedal is depressed and released.

      OK
      "Stop Light SW" turns on and off in accordance with the operation of the brake pedal.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  2. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BATTERY)


    1. for Bulb Type Stop Light


      1. Disconnect the stop light switch assembly connector.

      2. B0045ZKE02
        Text in Illustration
        *a

        Front view of wire harness connector

        (to Stop Light Switch Assembly)

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        A89-2 - Body ground Always 11 to 14 V

    2. for LED Type Stop Light


      1. Disconnect the stop light switch assembly connector.

      2. B004776E01
        Text in Illustration
        *a

        Front view of wire harness connector

        (to Stop Light Switch Assembly)

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        A83-7 (B) - A83-2 (GND) Always 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        A83-2 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. for Bulb Type Stop Light


      1. B0045T5E01
        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 released Below 1 Ω
        Switch pin pushed in 10 kΩ or higher

      2. Reconnect the A89 stop light switch assembly connector.

    2. for LED Type Stop Light


      1. Reconnect the stop light switch assembly connector.

      2. B00478NE01
        Text in Illustration
        *a

        Component with harness connected

        (Stop Light Switch Assembly)

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        A83-1 (OUT) - A83-2 (GND) Switch pin released 11 to 14 V
        Switch pin pushed in Below 1 V
        Result
        Result Proceed to
        OK (for Bulb Type Stop Light with Toyota Safety Sense) A
        OK (for Bulb Type Stop Light without Toyota Safety Sense) B
        OK (for LED Type Stop Light)
        NG C

    B

    CHECK HARNESS AND CONNECTOR (STP TERMINAL) Click here

    C

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    A

  4. CHECK HARNESS AND CONNECTOR (SWITCH INPUT)


    1. B0045ABE05
      Text in Illustration
      *1 No. 5 Relay Block
      *2 STP Relay

      Reconnect the stop light switch assembly connector.

    2. Remove the STP relay.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      STP relay terminal 4 - Body ground Stop light switch assembly ON (Brake pedal depressed) 11 to 14 V
      STP 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

  5. INSPECT STP RELAY


    1. B004892E02
      Text in Illustration
      *1 STP Relay

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 4 Battery voltage not applied Below 1 Ω
      3 - 4 Battery voltage applied to terminal 1 and 2 10 kΩ or higher

    NG

    REPLACE STP RELAY

    OK

  6. CHECK HARNESS AND CONNECTOR (STP TERMINAL)


    1. Disconnect the skid control ECU (brake actuator assembly) connector.

    2. B00469HE01
      Text in Illustration
      *A for LHD with CVT, and RHD
      *B for LHD except CVT
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

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

      Standard Voltage (for LHD with CVT, and RHD)
      Tester Connection Switch Condition Specified Condition
      A78-15 (STP2) - Body ground Brake pedal depressed 11 to 14 V
      Brake pedal released Below 1.5 V
      Standard Voltage (for LHD except CVT)
      Tester Connection Switch Condition Specified Condition
      A79-15 (STP2) - Body ground Brake pedal depressed 11 to 14 V
      Brake pedal released Below 1.5 V

    3. Reconnect the skid control ECU (brake actuator assembly) connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. RECONFIRM DTC


    1. Clear the DTC Click here.

    2. Check if the same DTC is output Click here.

      Result
      Result Proceed to
      DTC C1249 is not output A
      DTC C1249 is output (for LHD) B
      DTC C1249 is output (for RHD) C

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here