VEHICLE STABILITY CONTROL 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 turns on and the stop light comes on.

DTC Code 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 skid control relay (FR DEICER/BRAKE LP) drive output (STP0) 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 skid control relay (FR DEICER/BRAKE LP) drive output (STP0) 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 circuit

  • Skid control relay (FR DEICER/BRAKE LP)

  • Skid control relay (FR DEICER/BRAKE LP) circuit

  • Stop light control relay

  • Stop light control relay circuit

  • Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM

A01IR7XE01

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. INSPECT SKID CONTROL RELAY (FR DEICER/BRAKE LP)


    1. Remove the skid control relay from the engine room No. 1 relay block.

    2. A01ITDPE01
      Text in Illustration
      *1 Skid Control Relay (FR DEICER/BRAKE LP 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 to terminals 1 and 2 Below 1 Ω
      3 - 5 Battery voltage not applied to terminals 1 and 2 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

    REPLACE SKID CONTROL RELAY

    OK

  2. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK SKID CONTROL RELAY TERMINAL)


    1. Remove the skid control relay from the engine room No. 1 relay block.

    2. A01IQ5DE01
      Text in Illustration
      *1 Engine Room No. 1 Relay Block
      *2 Skid Control Relay (FR DEICER/BRAKE LP)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Relay block skid control relay terminal 5 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK SKID CONTROL RELAY TERMINAL)


    1. Remove the skid control relay from the engine room No. 1 relay block.

    2. A01IQ5DE01
      Text in Illustration
      *1 Engine Room No. 1 Relay Block
      *2 Skid Control Relay (FR DEICER/BRAKE LP)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Relay block skid control relay terminal 4 - Body ground Stop light switch on (Brake pedal depressed) 8 to 14 V
      Stop light switch off (Brake pedal released) Below 1.5 V

    NG

    CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL RELAY - ENGINE ROOM RELAY BLOCK) Click here

    OK

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


    1. Disconnect the skid control ECU connector.

    2. A01ITVSE30
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)
      *2 for AD Series Engine
      *3 for ZR Series Engine

      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) 8 to 14 V
      Stop light switch off (Brake pedal released) Below 1.5 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. 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)
      *2 for AD Series Engine
      *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) 8 to 14 V
      Stop light switch off (Brake pedal released) Below 1.5 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU STP0 TERMINAL)


    1. Disconnect the skid control ECU connector.

    2. A01ITVSE31
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)
      *2 for AD Series Engine
      *3 for ZR Series Engine

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A52 or A54-39 (STP0) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. 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 output. A
      DTC C1380/64 is not output. B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  8. CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL RELAY - ENGINE ROOM RELAY BLOCK)


    1. Disconnect the stop light control relay connector.

    2. Remove the skid control relay from the engine room No. 1 relay block.

    3. A01IQXWE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Stop Light Control Relay)
      *2 Engine Room No. 1 Relay Block
      *3 Skid Control Relay (FR DEICER/BRAKE LP)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A17-8 (OUT) - Relay block skid control relay terminal 4 Always Below 1 Ω
      A17-8 (OUT) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL RELAY +B, GND TERMINAL)


    1. Disconnect the stop light control relay connector.

    2. A01IU8WE03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Stop Light Control Relay)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A17-6 (+B) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A17-4 (GND) - Body ground Always Below 1Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL RELAY STP TERMINAL)


    1. Disconnect the stop light control relay connector.

    2. A01IU8WE04
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Stop Light Control Relay)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A17-2 (STP) - Body ground Stop light switch on (Brake pedal depressed) 8 to 14 V
      Stop light switch off (Brake pedal released) Below 1.5 V
      Result
      Result Proceed to
      NG A
      OK for LHD B
      OK for RHD C

    B

    REPLACE STOP LIGHT CONTROL RELAY Click here

    C

    REPLACE STOP LIGHT CONTROL RELAY Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR