VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1380

DTC Code DTC Name
C1380 Stop Light Control Relay Malfunction

DESCRIPTION

Upon receiving the hill-start assist control operating signal from the skid control ECU (master cylinder solenoid), the relay contact turns on and the stop light comes on.

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

DTC Code DTC Detection Condition Trouble Area
C1380

Either condition is met:


  1. When the voltage at the IG1 terminal is between 11 and 14 V and the stop light control relay drive output (STPO) is on, a signal is not input to the STP2 terminal for 5 seconds or more.

  2. When the voltage at terminal IG1 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.

  • Pre-crash safety system

  • STOP fuse

  • Harness or connector

  • Stop light control relay assembly

  • Skid control ECU (Master cylinder solenoid)

WIRING DIAGRAM

B001A1YE01

CAUTION / NOTICE / HINT

Note


  • After replacing the master cylinder solenoid, perform zero point calibration and store the system information Click here.

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

Tech Tips

When DTC C1425 is output together with DTC C1380, inspect and repair the trouble areas indicated by DTC C1425 first Click here.

PROCEDURE


  1. CHECK PRE-CRASH SAFETY SYSTEM


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch off.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Pre-Crash 2 / Trouble Codes.

    5. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    B

    GO TO PRE-CRASH SAFETY SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (EXO TERMINAL)


    1. Turn the engine switch off.

    2. Disconnect the skid control ECU (master cylinder solenoid) connector.

    3. B00184VE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU [Master Cylinder Solenoid])

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A24-42 (EXO) - Body ground Always Below 1.5 V

    NG

    CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - STOP LIGHT CONTROL RELAY ASSEMBLY) Click here

    OK

  3. CHECK MASTER CYLINDER SOLENOID


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.

      ABS/VSC/TRC
      Tester Display Test Part Control Range Diagnostic Note
      EBS Relay Stop light control relay assembly (Emergency brake signal) Relay ON/OFF -
    6. B0019NLE01
      Text in Illustration
      *a

      Component with harness connected

      (Stop Light Control Relay Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A58-4 (ESSI) - Body ground Active test is ON Below 1.5 V
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG (for LHD) C
      NG (for RHD) D

    A

    REPLACE STOP LIGHT CONTROL RELAY ASSEMBLY Click here

    B

    REPLACE STOP LIGHT CONTROL RELAY ASSEMBLY Click here

    C

    REPLACE MASTER CYLINDER SOLENOID Click here

    D

    REPLACE MASTER CYLINDER SOLENOID Click here

  4. CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - STOP LIGHT CONTROL RELAY ASSEMBLY)


    1. Disconnect the A24 skid control ECU (master cylinder solenoid) connector.

    2. Disconnect the A58 stop light control relay assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A24-42 (EXO) - A58-4 (ESSI) Always Below 1 Ω
      A24-42 (EXO) or A58-4 (ESSI) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A

    REPLACE STOP LIGHT CONTROL RELAY ASSEMBLY Click here

    B

    REPLACE STOP LIGHT CONTROL RELAY ASSEMBLY Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR