VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1380/64

DTC Code DTC Name
C1380/64 Stop Light Control Relay Malfunction

DESCRIPTION

Upon receiving the hill-start assist control operating signal from the skid control ECU, the relay contact turns on and the stop light comes on.

DTC Code DTC Detection Condition Trouble Area
C1380/64

Either of the following is detected:


  1. When the voltage at the IG1 terminal is between 10 and 14 V and the stop light control relay drive output (STP0) is ON, a signal has not been input to the STP terminal for 5 seconds or more.

  2. When the voltage at the IG1 terminal is between 10 and 14 V and the stop light control relay drive output (STP0) is OFF, the signal at the STP is different from the input signal at the STP2 for 5 seconds or more.

  • Stop light switch

  • Stop light switch circuit

  • Stop light control (BRK) relay

  • Stop light control (BRK) relay circuit

  • Brake actuator assembly (Skid control ECU)

WIRING DIAGRAM

Refer to DTC C1249/49 Click here.

INSPECTION PROCEDURE

Tech Tips

When DTC C1249/49 is output together with DTC C1380/64, inspect and repair the trouble areas indicated by DTC C1249/49 first 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

    INSPECT STOP LIGHT CIRCUIT Click here

    OK

  2. READ VALUE USING GTS (STOP LIGHT SWITCH)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Select the Data List on the GTS 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 condition observed on the GTS changes according to brake pedal operation.

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

    NG

    INSPECT SKID CONTROL ECU (STP TERMINAL) Click here

    OK

  3. PERFORM ACTIVE TEST USING GTS (STOP LIGHT CONTROL (BRK) RELAY)


    1. Select the Data List on the GTS Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stop Light Relay Stop light control (BRK) relay / ON or OFF

      ON: Relay on

      OFF: Relay off

      		 -
      Stop Light Relay Output Stop light control (BRK) relay output / ON or OFF

      ON: Relay output on

      OFF: Relay output off

      		 -

    2. Select the Active Test on the GTS Click here.

      ABS/VSC/TRC
      Tester Display Test Part Control Range Diagnostic Note
      Stop Light Relay Stop light control (BRK) relay Relay ON/OFF Stop lights come on

    3. Perform the Active Test of the stop light control (BRK) relay using the GTS.

    4. Check for stop light control (BRK) relay operation using Data List and stop light operation by performing an Active Test.

      Result
      Result Proceed to
      Data List content and stop light operation are normal A
      Data List content is normal but stop lights do not turn on or off B

    B

    INSPECT STOP LIGHT CONTROL (BRK) RELAY Click here

    A

  4. INSPECT SKID CONTROL ECU (STP2 TERMINAL)


    1. A01EIZEE59
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Brake Actuator (Skid Control ECU))

      Turn the ignition 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 connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A42-13 (STP2) - Body ground Stop light switch ON (Brake pedal depressed) 8 to 14 V
      A42-13 (STP2) - Body ground Stop light switch OFF (Brake pedal released) Below 1.5 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP2 CIRCUIT)

    OK

  5. RECONFIRM DTC


    1. Reconnect the skid control ECU connector.

    2. Clear the DTCs Click here.

    3. Start the engine.

    4. Perform a road test.

    5. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTC (C1380/64) is not output A
      DTC (C1380/64) is output B

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

  6. INSPECT STOP LIGHT CONTROL (BRK) RELAY


    1. A01EKUCE04
      Text in Illustration
      *1 Stop Light Control (BRK) Relay

      Turn the ignition switch off.

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

    3. 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 - 5 Voltage is not applied between terminals 1 and 2 10 kΩ or higher
      3 - 4 Voltage is applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Voltage is applied between terminals 1 and 2 Below 1 Ω

    NG

    REPLACE STOP LIGHT CONTROL (BRK) RELAY

    OK

  7. INSPECT ENGINE ROOM RELAY BLOCK (POWER SOURCE TERMINAL)


    1. A01EMC1E01
      Text in Illustration
      *1 Engine Room Relay Block
      *2 Stop Light Control (BRK) Relay

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Stop light control (BRK) relay terminal 5 - Body ground Always 11 to 14 V
      Stop light control (BRK) relay terminal 2 - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  8. INSPECT SKID CONTROL ECU (STP0 TERMINAL)


    1. A01EIZEE60
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Brake Actuator (Skid Control ECU))

      Install the stop light control (BRK) 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 connector.

    4. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A42-39 (STP0) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP0 CIRCUIT)

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  9. INSPECT SKID CONTROL ECU (STP TERMINAL)


    1. A01EIZEE52
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Brake Actuator (Skid Control ECU))

      Turn the ignition 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 connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A42-30 (STP) - Body ground Stop light switch ON (Brake pedal depressed) 8 to 14 V
      A42-30 (STP) - Body ground Stop light switch OFF (Brake pedal released) Below 1.5 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here