VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1379

DTC Code DTC Name
C1379 Downhill Assist Control Switch Malfunction (Test Mode DTC)

DESCRIPTION

DTC C1379 will be deleted when the downhill assist control switch sends a downhill assist control operation signal or when Test Mode ends. DTC C1379 is output only in Test Mode.

DTC Code DTC Detection Condition Trouble Area
C1379 Detected only during Test Mode. Downhill assist control switch

WIRING DIAGRAM

A017E2SE01

INSPECTION PROCEDURE

Note

When replacing the brake actuator assembly, perform zero point calibration Click here.

PROCEDURE


  1. READ VALUE ON INTELLIGENT TESTER (DOWNHILL ASSIST CONTROL SWITCH)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Select the Data List mode on the intelligent tester Click here.

      ABS / VSC / TRC:
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Downhill Assist Control Switch Downhill assist control switch / ON or OFF

      ON: Switch ON

      OFF: Switch OFF

      		 -

    4. Using the intelligent tester, check the switch condition on the intelligent tester changes according to downhill assist control switch operation.

      OK
      The intelligent tester displays ON or OFF according to downhill assist control switch operation.

    NG

    INSPECT DOWNHILL ASSIST CONTROL SWITCH Click here

    OK

  2. PERFORM TEST MODE (SIGNAL CHECK)


    1. Turn the ignition switch off.

    2. Perform the sensor check in the Test Mode procedure Click here.

      OK
      All Test Mode DTCs are erased.

      Tech Tips

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Click here.


    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here

  3. INSPECT DOWNHILL ASSIST CONTROL SWITCH


    1. A017F8IE01

      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 downhill assist control switch connector.

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

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      4 (B) - 1 (E) Switch is pushed in Below 1 Ω
      4 (B) - 1 (E) Switch is not pushed in 10 kΩ or higher

      Note

      Check the downhill assist control switch signal after replacement Click here.


    NG

    REPLACE DOWNHILL ASSIST CONTROL SWITCH Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - DOWNHILL ASSIST CONTROL SWITCH)


    1. A017E9YE01

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

    2. Disconnect the skid control ECU connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A24-26 (HDCS) - g2-4 (B) Always Below 1 Ω
      A24-26 (HDCS) - Body ground Always 10 kΩ or higher
      g2-1 (E) - Body ground Always Below 1 Ω

      Tech Tips

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Click here.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here