ELECTRONICALLY CONTROLLED BRAKE 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 INF Code DTC Detection Condition Trouble Area
C1380/64 761 When the voltage at the BI terminal is 8.9 V or more and the stop light control relay drive output (STP0) is on, a signal is not input to the STP2 terminal for 2 seconds or more.

  • Stop light switch

  • Stop light switch circuit

  • Stop light control relay

  • Stop light control relay circuit

  • Brake booster with master cylinder (Skid control ECU)
↑ 762 When the voltage at the BI terminal is 8.9 V or more and the stop light control relay drive output (STP0) is off, the signal at the STP terminal is different from the input signal at the STP2 for 5 seconds or more.

  • Stop light switch

  • Stop light switch circuit

  • Stop light control relay

  • Stop light control relay circuit

  • Brake booster with master cylinder (Skid control ECU)

WIRING DIAGRAM

Refer to DTC C1249/49 Click here.

INSPECTION PROCEDURE

Note

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

Tech Tips

When C1249/49 is output together with C1380/64, inspect and repair the trouble areas indicated by 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 LIGHTING SYSTEM (STOP LIGHT CIRCUIT) Click here

    OK

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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    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 condition 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

    INSPECT SKID CONTROL ECU (STP TERMINAL) Click here

    OK

  3. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (STOP LIGHT CONTROL RELAY)


    1. Select the Active Test on the intelligent tester Click here.

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

    2. Perform the Active Test of the stop light control relay using the intelligent tester.

    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 Relay Output Stop light control relay output / ON or OFF

      ON: Relay output on

      OFF: Relay output off

      		 -

    4. Check for stop light control 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 RELAY Click here

    A

  4. INSPECT SKID CONTROL ECU (STP2 TERMINAL)


    1. A003UTKE44
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU)

      Turn the power switch off.

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

    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
      A104-6 (STP2) - Body ground Stop light switch ON (Brake pedal depressed) 11 to 14 V
      A104-6 (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. Turn the power switch on (READY).

    4. Perform a road test.

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

      Result
      Result Proceed to
      DTC C1380/64 is not output A
      DTC C1380/64 is output (for LHD) B
      DTC C1380/64 is output (for RHD) C

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

    C

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

  6. INSPECT STOP LIGHT CONTROL RELAY


    1. A003RVVE02
      Text in Illustration
      *1 Stop Light Control Relay (STOP LP Relay)

      Turn the power switch off.

    2. Remove the stop light control 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 RELAY

    OK

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


    1. A003SNRE01
      Text in Illustration
      *1 Engine Room Relay Block
      *2 Stop Light Control Relay (STOP LP Relay)

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

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  8. INSPECT SKID CONTROL ECU (STP0 TERMINAL)


    1. A003UTKE46
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU)

      Install the stop light control relay.

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

    3. Disconnect the skid control ECU connector.

    4. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A104-3 (STP0) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP0 CIRCUIT)

    A

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

  9. INSPECT SKID CONTROL ECU (STP TERMINAL)


    1. A003UTKE45
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU)

      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 connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A104-33 (STP) - Body ground Stop light switch ON (Brake pedal depressed) 11 to 14 V
      A104-33 (STP) - Body ground Stop light switch OFF (Brake pedal released) Below 1.5 V
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)

    A

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here