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ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1380/64

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

Upon receiving the hill-start assist control operating signal from the skid control ECU (brake booster with master cylinder assembly), the relay contact turns on and the stop lights come on.

Upon receiving the emergency brake signal operating signal from the skid control ECU (brake booster with master cylinder assembly), the relay contact turns on and the stop light blinks.

DTC No. INF Code DTC Detection Condition Trouble Area
C1380/64 761

Either of the following is detected:


  1. When the stop light switch assembly input (STP) is ON and the No. 1 integration relay output (STP0) is ON, a signal is not input to the EXO and STP2 terminals for 2 seconds or more.

  2. When the stop light switch assembly input (STP) is OFF and the No. 1 integration relay output (STP0) is ON, a signal is not input to the EXO and STP2 terminals for 2 seconds or more.

  • Stop light switch assembly circuit

  • No. 1 integration relay (Engine room junction block assembly)

  • No. 1 integration relay circuit

  • Skid control ECU (Brake booster with master cylinder assembly)
↑ 762 When the stop light switch assembly input (STP) is OFF and the No. 1 integration relay output (STP0 and EXO) is OFF, a signal is input to the STP2 terminal for 2 seconds or more. ↑
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WIRING DIAGRAM

Refer to DTC C1249/49 (Click here).

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CAUTION / NOTICE / HINT

Note:

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

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

Tip:

When C1249/49 is output together with C1380/64, inspect and repair the trouble areas indicated by C1249/49 first (Click here).

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PROCEDURE


  1. Click here

    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

  2. Click here

    READ VALUE USING GTS (STOP LIGHT SWITCH ASSEMBLY)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the Data List on the GTS (Click here).

      Table 1. ABS/VSC/TRC
      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 GTS changes according to brake pedal operation.

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

  3. Click here

    PERFORM ACTIVE TEST USING GTS (NO. 1 INTEGRATION RELAY)


    1. Select the Active Test on the GTS (Click here).

      Table 2. ABS/VSC/TRC
      Tester Display Test Part Control Range Diagnostic Note
      Stop Light Relay No. 1 integration relay Relay ON/OFF Stop lights come on
      EBS Relay No. 1 integration relay (for emergency brake signal) / ON or OFF

      ON: Relay on

      OFF: Relay off

      • Hazard warning switch ON

      • Stop light switch assembly ON

    2. Perform the Active Test of the No. 1 integration relay (engine room junction block assembly) using the GTS.

    3. Select the Data List on the GTS (Click here).

      Table 3. ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stop Light Relay Output No. 1 integration relay output / ON or OFF

      ON: Relay output on

      OFF: Relay output off

      		 -
      EBS Relay No. 1 integration relay (for emergency brake signal) Relay ON/OFF

      • Hazard warning switch ON

      • Stop light switch assembly ON

    4. Check for No. 1 integration relay (engine room junction block assembly) 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

  4. Click here

    CHECK HARNESS AND CONNECTOR (STP2 TERMINAL)


    1. A0008BBE01

      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 A24 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
      A24-6 (STP2) - Body ground Stop light switch assembly ON (Brake pedal depressed) 11 to 14 V
      A24-6 (STP2) - Body ground Stop light switch assembly OFF (Brake pedal released) Below 1.5 V
      Table 4. Text in Illustration
      *a

      Front view of wire harness connector

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

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR (STP2 CIRCUIT)

  5. Click here

    RECONFIRM DTC


    1. Reconnect the A24 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 (for LHD). B
      DTC C1380/64 is output (for RHD). C

    • A

      USE SIMULATION METHOD TO CHECK (Click here)

    • B

      REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

    • C

      REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

  6. Click here

    INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY


    1. Turn the power switch off.

    2. Check the No. 1 integration relay (engine room junction block assembly) (Click here).

      OK
      The No. 1 integration relay (engine room junction block assembly) is normal.

  7. Click here

    CHECK HARNESS AND CONNECTOR (STP0 OR EXO TERMINAL)


    1. A0004QAE01

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

    2. Disconnect the A24 skid control ECU (brake booster with master cylinder assembly) connector.

    3. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A24-3 (STP0) - Body ground Power switch on (IG) 11 to 14 V
      A24-21 (EXO) - Body ground Stop light switch assembly ON (Brake pedal depressed) 11 to 14 V
      A24-21 (EXO) - Body ground Stop light switch assembly OFF (Brake pedal released) Below 1.5 V
      Table 5. Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    • A

      REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

    • B

      REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

    • C

      REPAIR OR REPLACE HARNESS OR CONNECTOR (STP0 OR EXO CIRCUIT)

  8. Click here

    CHECK HARNESS AND CONNECTOR (STP TERMINAL)


    1. A0008DHE01

      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 A24 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
      A24-33 (STP) - Body ground Stop light switch assembly ON (Brake pedal depressed) 11 to 14 V
      A24-33 (STP) - Body ground Stop light switch assembly OFF (Brake pedal released) Below 1.5 V
      Table 6. Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    • A

      REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

    • B

      REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

    • C

      REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)