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 (brake booster with master cylinder assembly), the relay contact turns on and the stop lights come on.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1380/64 Stop Light Control Relay Malfunction

761

762

  • INF Code: 761


    • When the voltage at terminal IG1 is 9.5 V or more and stop light control relay drive output (STP0) is ON, a signal is not input to the STP2 terminal for 2 seconds or more.


  • INF Code: 762


    • When the voltage at terminal IG1 is 9.5 V or more and 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 assembly circuit

  • Stop light control relay (Stop light switch assembly)

  • Stop light control relay (Stop light switch assembly) circuit

  • Skid control ECU (Brake booster with master cylinder assembly)

 VSC DTC

WIRING DIAGRAM

A01G2JME02

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 procedure.

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
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT) Click here

    OK

  2. 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


      Chassis > ABS/VSC/TRC > Data List
      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

      		 -

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      Stop Light SW

    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.
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (STP TERMINAL) Click here

    OK

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


    1. Select the Active Test on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay Stop light control relay (Stop light switch assembly) Relay (Switch) ON/OFF Stop lights come on

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display
      Stop Light Relay

    2. Perform the Active Test of the stop light control relay (stop light switch assembly) using the GTS.

    3. Select the Data List on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light Relay Output Stop light control relay (Stop light switch assembly) output ON or OFF

      ON: Relay (Switch) output on

      OFF: Relay (Switch) output off

      		 -

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      Stop Light Relay Output

    4. Check for stop light control relay (stop light switch assembly) operation using the Data List and stop light operation by performing the 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

    INSPECT STOP LIGHT SWITCH ASSEMBLY Click here

    A

  4. CHECK HARNESS AND CONNECTOR (STP TERMINAL)


    1. A01G3LLC31
      *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 A144 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
      A144-6 (STP2) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      A144-6 (STP2) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V
      A144-33 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      A144-33 (STP) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)

    OK

  5. RECONFIRM DTC


    1. Reconnect the A144 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the power switch on (READY).

    4. Perform a road test.

    5. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1380/64 is not output. A
      DTC C1380/64 is output. B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for LHD: Click here
    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for RHD: Click here

  6. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. Turn the power switch off.

    2. Check the stop light control relay (stop light switch assembly).

      Click here

      OK
      The stop light control relay (stop light switch assembly) is normal.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (STP0 TERMINAL)


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

    2. Disconnect the A144 skid control ECU (brake booster with master cylinder assembly) connector.

    3. Turn the power switch on (IG).

    4. A01G3LLC32
      *a

      Front view of wire harness connector

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A144-3 (STP0) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for LHD: Click here
    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for RHD: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP0 CIRCUIT)

  8. CHECK HARNESS AND CONNECTOR (STP TERMINAL)


    1. A01G3LLC33
      *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 A144 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
      A144-33 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      A144-33 (STP) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for LHD: Click here
    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for RHD: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)