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 control relay (Stop light switch assembly)*1

  • Stop light control relay (Stop light switch assembly) circuit*1

  • Stop light control relay (STOP relay)*2

  • Stop light control relay (STOP relay) circuit*2

  • 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

A01V1ZXE03
A01V27JE03

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.

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
    OK
  2. READ VALUE USING GTS (STOP LIGHT SWITCH ASSEMBLY)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON (IG).

    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 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.

    NG
    OK
  3. PERFORM ACTIVE TEST USING GTS (Stop Light Relay)


    1. 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 relay (Stop light switch assembly)*1

      Stop light control relay (STOP relay)*2

      Relay (Switch) ON/OFF Stop lights come on
    2. Perform the Active Test of the stop light control relay (stop light switch assembly)*1 or Stop light control relay (STOP relay)*2 using the GTS.

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

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stop Light Relay Output

      Stop light control relay (Stop light switch assembly)*1

      Stop light control relay (STOP relay)*2 output / ON or OFF

      ON: Relay output on

      OFF: Relay output off

      -
    4. Check for stop light control relay (stop light switch assembly)*1 or Stop light control relay (STOP relay)*2 operation using the Data List and stop light operation by performing an Active Test.


      • *1: for LED Type Stop Light

      • *2: for Bulb Type Stop Light

      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 (for LED Type Stop Light). B
      Data List content and stop light operation are abnormal or Data List content is normal but stop lights do not turn on or off (for Bulb Type Stop Light). C

    B
    C
    A
  4. CHECK HARNESS AND CONNECTOR (STP TERMINAL)


    1. A01V0V3E01
      Text in Illustration
      *a

      Front view of wire harness connector

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

      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 (brake booster with master cylinder assembly) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A29-33 (STP) - Body ground Stop light switch assembly ON (Brake pedal depressed) 11 to 14 V
      A29-33 (STP) - Body ground Stop light switch assembly OFF (Brake pedal released) Below 1.5 V

    NG
    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 ignition switch to 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
    B
    C
  6. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. 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
      Result Proceed to
      NG A
      OK B

    A
    B
  7. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


    1. A01V20VE05
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 Stop Light Control Relay (STOP Relay)

      Turn the ignition 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 Switch 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 Ignition switch ON (IG) 11 to 14 V

    NG
    OK
  8. INSPECT STOP LIGHT CONTROL RELAY (STOP RELAY)


    1. A01UY73E01
      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 Battery voltage not applied Below 1 Ω
      3 - 5 Battery voltage not applied 10 kΩ or higher
      3 - 4 Battery voltage applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 Battery voltage applied to terminals 1 and 2 Below 1 Ω

    NG
    OK
  9. CHECK HARNESS AND CONNECTOR (STP0 TERMINAL)


    1. A01UZ6PE02
      Text in Illustration
      *a

      Front view of wire harness connector

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

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

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

    3. Turn the ignition switch to ON (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A29-3 (STP0) - Body ground Ignition switch ON (IG) 11 to 14 V
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A
    B
    C
  10. CHECK HARNESS AND CONNECTOR (STP2 TERMINAL)


    1. A01UZBOE01
      Text in Illustration
      *a

      Front view of wire harness connector

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

      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 (brake booster with master cylinder assembly) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A29-6 (STP2) - Body ground Stop light switch assembly ON (Brake pedal depressed) 11 to 14 V
      A29-6 (STP2) - Body ground Stop light switch assembly OFF (Brake pedal released) Below 1.5 V
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A
    B
    C