VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1380

DTC Code DTC Name
C1380 Stop Light Control Relay Malfunction

DESCRIPTION

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

DTC No.

DTC Detection Condition

Trouble Area

C1380

Either condition is met:

  1. When the voltage at the IG1 terminal is between 9.5 V or more 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 the IG1 terminal is between 9.5 V or more 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.

  • Wire harness or connector

  • Stop light switch assembly

  • Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM

C323175E02

CAUTION / NOTICE / HINT

Note:

  • When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibration (Click here).

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

PROCEDURE

  1. CHECK DTC

    1. Check if the same DTC is output (Click here).

      Result

      Result

      Proceed to

      C1380 is output.

      A

      DTCs C1249, C1425, C1426 and/or C1380 are output.

      B
      Tip:

      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.

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

    (Click here)

  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

      Condition

      Illumination Condition

      Brake pedal depressed.

      ON

      Brake pedal released.

      OFF

    INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT)

    (Click here)

  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).

      Table 1. ABS/VSC/TRC

      Tester Display

      Measurement Item/Range

      Normal Condition

      Diagnostic Note

      Stop Light SW

      Stop light switch assembly/ OFF or ON

      ON: Brake pedal depressed

      OFF: Brake pedal released

      -

    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.

    CHECK TERMINAL VOLTAGE (STP TERMINAL)Click here

  4. CHECK TERMINAL VOLTAGE (STP2 TERMINAL)

    1. 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. U123613E02

      Disconnect the A78 (for CVT) or A79 (except CVT) skid control ECU (brake actuator assembly) connector.

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

      Standard Voltage (for CVT)

      Tester Connection

      Switch Condition

      Specified Condition

      A78-22 (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

      Standard Voltage (except CVT)

      Tester Connection

      Switch Condition

      Specified Condition

      A79-24 (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
      Table 2. Text in Illustration

      *A

      for CVT

      *B

      except CVT

      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))
      Tip:

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

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP2 CIRCUIT)

  5. CHECK TERMINAL VOLTAGE (STPO TERMINAL)

    1. 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. U123609E02

      Disconnect the A78 (for CVT) or A79 (except CVT) skid control ECU (brake actuator assembly) connector.

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

      Standard Voltage (for CVT)

      Tester Connection

      Switch Condition

      Specified Condition

      A78-3 (STPO) - Body ground

      Ignition switch ON

      11 to 14 V

      Standard Voltage (except CVT)

      Tester Connection

      Switch Condition

      Specified Condition

      A79-28 (STPO) - Body ground

      Ignition switch ON

      11 to 14 V
      Table 3. Text in Illustration

      *A

      for CVT

      *B

      except CVT

      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

    CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)Click here

  6. RECONFIRM DTC

    1. Reconnect the A78 (for CVT) or A79 (except CVT) skid control ECU (brake actuator assembly) connector.

    2. Clear the DTCs (Click here).

    3. Turn the ignition switch off.

    4. Start the engine.

    5. Perform a road test.

    6. Check if the same DTC is output (Click here).

      Result

      Result

      Proceed to

      DTC C1380 is not output.

      A

      DTC C1380 is output.

      B

    USE SIMULATION METHOD TO CHECK

    (Click here)

    REPLACE BRAKE ACTUATOR ASSEMBLY

    (Click here)

  7. CHECK TERMINAL VOLTAGE (STP TERMINAL)

    Click here

    REPLACE BRAKE ACTUATOR ASSEMBLY

    (Click here)

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

    1. Turn the ignition switch off.

    2. Disconnect the A55 stop light switch assembly connector.

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

      Standard Resistance (for CVT)

      Tester Connection

      Condition

      Specified Condition

      A78-30 (STP) - A55-3 (L)

      Always

      Below 1 Ω

      A78-30 (STP) or A55-3 (L) - Body ground

      Always

      10 kΩ or higher

      Standard Resistance (except CVT)

      Tester Connection

      Condition

      Specified Condition

      A79-6 (STP) - A55-3 (L)

      Always

      Below 1 Ω

      A79-6 (STP) or A55-3 (L) - Body ground

      Always

      10 kΩ or higher

    REPLACE STOP LIGHT SWITCH ASSEMBLY

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

    1. Turn the ignition switch off.

    2. Disconnect the A55 stop light switch assembly connector.

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

      Standard Resistance (for CVT)

      Tester Connection

      Condition

      Specified Condition

      A78-3 (STPO) - A55-4 (ACC)

      Always

      Below 1 Ω

      A78-3 (STPO) or A55-4 (ACC) - Body ground

      Always

      10 kΩ or higher

      Standard Resistance (except CVT)

      Tester Connection

      Condition

      Specified Condition

      A79-28 (STPO) - A55-4 (ACC)

      Always

      Below 1 Ω

      A79-28 (STPO) or A55-4 (ACC) - Body ground

      Always

      10 kΩ or higher

    REPLACE STOP LIGHT SWITCH ASSEMBLY

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR