VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1380

DTC Code DTC Name
C1380 Stop Light Control Relay Malfunction

DESCRIPTION

Upon receiving the trailer sway control or brake hold control operating signal from the skid control ECU (brake actuator 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 actuator assembly), the relay contact turns on and the stop light blinks.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
C1380 Stop Light Control Relay Malfunction

  • When the voltage at terminal +BS is 9.5 V or higher, stop light drive output (STPO) is ON and STP2 and EXO are OFF for 5 seconds or more.

  • When the voltage at terminal +BS is 9.5 V or higher, stop light drive output (STPO) is OFF, EXO is OFF, and input signals for STP and STP2 differ for 5 seconds or more.

  • Wire harness or connector

  • Skid control ECU (Brake actuator assembly)

  • STOP fuse

  • Stop light control ECU assembly

 -

WIRING DIAGRAM

B005B98E06

CAUTION / NOTICE / HINT

Note


  • When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information.

    Click here

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

PROCEDURE


  1. CHECK STOP LIGHT OPERATION


    1. Check that the all 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 Click here

    OK

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


    1. Connect the GTS to the DLC3.

    2. Turn the engine 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

      OFF: Brake pedal released

      ON: Brake pedal depressed

      		 -

      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 ECU ASSEMBLY)


    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 ECU assembly (stop light control relay) ECU (Relay) ON/OFF

      Stop lights come on

      Vehicle condition: Vehicle stopped
      EBS Relay Stop light control ECU assembly output (Emergency brake signal operation) Stop light control ECU assembly (Emergency brake signal operation) ON/OFF

      • Hazard warning switch off

      • Stop light switch assembly on

      • When performing the Active Test, stop light blinks due to depressing brake pedal when Data List is ON

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

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display
      EBS Relay

    2. Perform the Active Test of the stop light control ECU 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 ECU assembly (stop light control relay) output ON or OFF

      OFF: ECU (Relay) output off

      ON: ECU (Relay) output on

      		 -
      EBS Relay Stop light control ECU assembly (Emergency brake signal operation status) ON or OFF

      ON: Not during emergency brake signal control

      OFF: During emergency brake signal control

      		 Hazard warning switch off (when performing Active Test, stop light blinks due to depressing brake pedal when Data List ON)

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

    4. Check for stop light control ECU 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 CONTROL ECU ASSEMBLY Click here

    A

  4. CHECK HARNESS AND CONNECTOR (STP2 TERMINAL)


    1. B005ABPC09
      *a

      Front view of wire harness connector

      (to Skid Control ECU [Brake Actuator Assembly])

      Turn the engine switch off.

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

    3. Disconnect the A36 skid control ECU (brake actuator assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A36-5 (STP2) - Body ground Stop light switch assembly on (Brake pedal depressed) 8 to 14 V
      A36-5 (STP2) - 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 (STP2 CIRCUIT)

    OK

  5. RECONFIRM DTC


    1. Reconnect the A36 skid control ECU (brake actuator assembly) connector.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the engine switch off.

    4. Perform a road test.

    5. Check if the same DTC is recorded.

      Click here


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

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  6. CHECK HARNESS AND CONNECTOR (STP TERMINAL)


    1. B005ABPC10
      *a

      Front view of wire harness connector

      (to Skid Control ECU [Brake Actuator Assembly])

      Turn the engine switch off.

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

    3. Disconnect the A36 skid control ECU (brake actuator assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A36-35 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 8 to 14 V
      A36-35 (STP) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)

  7. INSPECT STOP LIGHT CONTROL ECU ASSEMBLY


    1. Turn the engine switch off.

    2. Check the stop light control ECU assembly.

      for LHD: Click here

      for RHD: Click here

      OK
      The stop light control ECU assembly is normal.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE STOP LIGHT CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE STOP LIGHT CONTROL ECU ASSEMBLY for RHD: Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT CONTROL ECU ASSEMBLY)


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

    2. Disconnect the A36 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the A3 stop light control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A36-26 (STPO) -A3-9 (ACC) Always Below 1 Ω
      A36-26 (STPO) or A3-9 (ACC) - Body ground Always 10 kΩ or higher
      A36-2 (EXO) - A3-4 (ESSI) Always Below 1 Ω
      A36-2 (EXO) or A3-4 (ESSI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP0 CIRCUIT)