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 lights come on.

DTC No. INF Code DTC Detection Condition Trouble Area
C1380/64 761 When the voltage at the IG1 terminal is 9.5 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 assembly circuit

  • Stop light control relay (STOP relay)

  • Stop light control relay (STOP relay) circuit

  • Skid control ECU (Brake booster with master cylinder assembly)
↑ 762 When the voltage at the IG1 terminal is 9.5 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. ↑

WIRING DIAGRAM

Refer to DTC C1249/49 Click here.

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.

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 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 condition 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. PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT CONTROL RELAY (STOP RELAY))


    1. Select the Active Test on the Techstream Click here.

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

    2. Perform the Active Test of the stop light control relay (STOP relay) using the Techstream.

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

      ABS/VSC/TRAC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stop Light Relay Output Stop light control relay (STOP relay) output / ON or OFF

      ON: Relay output on

      OFF: Relay output off

      		 -

    4. Check for stop light control relay (STOP relay) operation using the 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 and stop light operation are abnormal or Data List content is normal but stop lights do not turn on or off. B

    B

    CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL) Click here

    A

  4. CHECK HARNESS AND CONNECTOR (STP2 TERMINAL)


    1. A01HV5JE94
      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
      A28-6 (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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP2 CIRCUIT)

    OK

  5. 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. 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. B

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

  6. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


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

      Turn the power switch off.

    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 5 - Body ground Always 11 to 14 V
      Stop light control relay (STOP relay) terminal 2 - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    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 - 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 (STOP RELAY)

    OK

  8. CHECK HARNESS AND CONNECTOR (STP0 TERMINAL)


    1. A01HV5JE99
      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 connectors.

    3. Disconnect the skid control ECU (brake booster with master cylinder assembly) 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 Condition Specified Condition
      A28-3 (STP0) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP0 CIRCUIT)

    OK

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

  9. 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)

    OK

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here