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 (brake actuator assembly), the relay contact turns on and the stop light comes on.

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

Either condition is met:


  • When the voltage at the IG1 terminal is between 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.

  • When the voltage at the IG1 terminal is between 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 terminal for 5 seconds or more.

  • Wire harness or connector

  • Stop light control relay (STOP LP)

  • Skid control ECU (brake actuator assembly)

WIRING DIAGRAM

A01M01TE19

CAUTION / NOTICE / HINT

Note


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

    Click here

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

PROCEDURE


  1. CHECK DTC


    1. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1380 is output. A
      DTCs C1249, C1425, C1426 and/or C1380 are output. B

      Tech Tips

      When C1249, C1425 and/or C1426 are output together with C1380 inspect and repair the trouble areas indicated by C1249, C1425 and/or C1426 first.

      Click here


    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  2. 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
      Result Illumination Condition
      Brake pedal depressed. On
      Brake pedal released. Off
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT) Click here

    OK

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


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Select the Data List on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Type Normal Condition Diagnostic Note
      Stop Light SW Stop light switch ON or OFF

      ON: Brake pedal depressed

      OFF: Brake pedal released

      		 -

      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

  4. PERFORM ACTIVE TEST USING GTS (STOP LIGHT CONTROL RELAY (STOP RELAY))


    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 relay (STOP LP) Relay ON/OFF Stop lights come on

    2. Perform the Active Test of the stop light control relay (STOP LP) using the GTS.


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

    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 relay (STOP LP) output ON or OFF

      ON: Relay output on (Stop light on)

      OFF: Relay output off (Stop light off)

      		 -

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

    4. Check for stop light control relay (STOP LP) 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 HARNESS AND CONNECTOR (POWER SOURCE TERMINAL) Click here

    A

  5. CHECK HARNESS AND CONNECTOR (STP, STP2 TERMINAL)


    1. A01M3GCC11
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator 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 A97 skid control ECU (brake actuator assembly) connector.

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

    5. Check the operation of the stop light when operating it with the GTS.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A97-22 (STP2) - Body ground Stop light switch assembly ON (Brake pedal depressed) 11 to 14 V
      A97-22 (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

    OK

  6. RECONFIRM DTC


    1. Reconnect the A97 skid control ECU (brake actuator assembly) connector.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the ignition switch to ON.

    4. Perform a road test.

    5. Check if the same DTC is output.

      Click here


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

    A

    CHECK USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  7. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

    A01M39KC01
    *1 Engine Room Relay Block and Junction Block Assembly
    *2 Stop Light Control Relay (STOP LP)

    1. Turn the ignition switch off.

    2. Remove the stop light control relay (STOP LP) from the engine room relay block and junction block assembly.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      5 - Body ground Always 11 to 14 V
      2 - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE TERMINAL)

    OK

  8. INSPECT STOP LIGHT CONTROL RELAY (STOP LP)

    A01M0DFC05
    *1 Stop Light Control Relay (STOP LP)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 4 Voltage is not applied between terminals 1 and 2 Below 1 Ω
      3 - 5 Voltage is not applied between terminals 1 and 2 10 kΩ or higher
      3 - 4 Voltage is applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Voltage is applied between terminals 1 and 2 Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE STOP LIGHT CONTROL RELAY (STOP LP)

    OK

  9. CHECK HARNESS AND CONNECTOR (STP0 TERMINAL)


    1. A01M3GCC12
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

      Install the stop light control relay (STOP LP).

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

    3. Disconnect the A97 skid control ECU (brake actuator assembly) connector.

    4. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A97-3 (STP0) - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP0 CIRCUIT)

  10. CHECK HARNESS AND CONNECTOR (STP TERMINAL)


    1. A01M3GCC05
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator 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 A97 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
      A97-30 (STP) - Body ground Stop light switch ON (Brake pedal depressed) 11 to 14 V*
      A97-30 (STP) - Body ground Stop light switch OFF (Brake pedal released) Below 1.5 V

      Tech Tips

      *: The standard voltage value varies depending on the +BS terminal voltage value. The standard voltage is 85% of the +BS terminal voltage.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)