VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1380/64

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

DESCRIPTION

The stop light control relay is built into the stop light switch assembly.

Upon receiving the hill-start assist control operating signal from the skid control ECU, the relay turns on and the stop light comes on.

DTC No. DTC Detection Condition Trouble Area
C1380/64

Either condition is met:


  1. When the voltage at the IG1 terminal is between 10 and 14 V and the stop light control relay drive output (STPO) is ON, a signal has not been input to the STP2 terminal for 5 seconds or more.

  2. When the voltage at the IG1 terminal is between 10 and 14 V and the stop light control relay drive output (STPO) is OFF, the signal at the STP terminal is different from the input signal at the STP2 terminal for 5 seconds or more.

  • STOP fuse

  • Stop light switch assembly

  • Stop light switch circuit

  • Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM

A01IP3YE04

INSPECTION PROCEDURE

Note


  • When replacing the skid control ECU (brake actuator assembly), perform the engine variant learning Click here.

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

Tech Tips

When DTC C1249/49 is output together with DTC C1380/64, inspect and repair the trouble areas indicated by DTC 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

    INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT) Click here

    OK

  2. READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SW)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

    5. According to the display on the intelligent tester, read the Data List.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stop Light SW Stop light switch/ OFF or ON

      ON: Brake pedal depressed

      OFF: Brake pedal released

      		 -

    6. Check that the stop light switch assembly condition observed on the intelligent tester changes according to brake pedal operation.

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

    NG

    Click here

    OK

  3. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


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

    2. According to the display on the intelligent tester, perform the Active Test.

      ABS/VSC/TRC
      Tester Display Test Part Control Range Diagnostic Note
      Stop Light Relay Stop light control relay Relay OFF/ON Stop lights come on.

    3. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

    4. According to the display on the intelligent tester, read the Data List.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stop Light Relay Output Stop light control relay output/ OFF or ON

      ON: Relay output on

      OFF: Relay output off

      		 -

    5. Check for stop light control relay (stop light switch 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

    B

    CHECK STOP LIGHT SWITCH ASSEMBLY Click here

    A

  4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU STP2 TERMINAL)


    1. A01ITVSE33
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU [Brake Actuator Assembly])
      *2 for AD Series Engine, 1WW
      *3 for ZR Series Engine

      Disconnect the skid control ECU connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A52 or A54-13 (STP2) - Body ground Stop light switch on (Brake pedal depressed) 11 to 14 V
      Stop light switch off (Brake pedal released) Below 1.5 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP2 CIRCUIT)

    OK

  5. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Start the engine.

    3. Depress the brake pedal several times to test the stop light circuit.

    4. 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. B

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  6. CHECK STOP LIGHT SWITCH ASSEMBLY


    1. Check the stop light switch assembly Click here.

      OK
      The stop light switch assembly is normal.

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU STPO TERMINAL)


    1. A01ITVSE35
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU [Brake Actuator Assembly])
      *2 for AD Series Engine, 1WW
      *3 for ZR Series Engine

      Disconnect the skid control ECU connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A52 or A54-39 (STPO) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STPO CIRCUIT)

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  8. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU STP TERMINAL)


    1. A01ITVSE29
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU [Brake Actuator Assembly])
      *2 for AD Series Engine, 1WW
      *3 for ZR Series Engine

      Disconnect the skid control ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A52 or A54-30 (STP) - Body ground Stop light switch on (Brake pedal depressed) 11 to 14 V
      Stop light switch off (Brake pedal released) Below 1.5 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here