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 No. Detection Item DTC Detection Condition Trouble Area
C1379 Downhill Assist Control Switch Malfunction (Test Mode DTC) Detected only during Test Mode. Downhill assist control switch

WIRING DIAGRAM

A0027IWE01

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information.

Click here

PROCEDURE


  1. READ VALUE USING GTS (DOWNHILL ASSIST CONTROL SWITCH)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Select the Data List using the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Downhill Assist Control SW Downhill assist control switch ON or OFF

      ON: Switch on

      OFF: Switch off

      		 for AWD

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      Downhill Assist Control SW

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

      OK
      The GTS displays ON or OFF according to downhill assist control switch operation.
      Result
      Result
      OK
      NG

    NG

    INSPECT DOWNHILL ASSIST CONTROL SWITCH Click here

    OK

  2. PERFORM TEST MODE INSPECTION (SIGNAL CHECK)


    1. Perform the sensor check in Test Mode Procedure.

      Click here


      Chassis > ABS/VSC/TRC > Utility
      Tester Display
      Signal Check
      OK
      All Test Mode DTCs are cleared.

      Tech Tips

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

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  3. INSPECT DOWNHILL ASSIST CONTROL SWITCH


    1. A0028VQC01
      *a

      Component without harness connected

      (Downhill Assist Control Switch))

      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 F41 downhill assist control switch connector.

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

      Standard Resistance
      Tester Connection 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

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE DOWNHILL ASSIST CONTROL SWITCH Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - DOWNHILL ASSIST CONTROL SWITCH)


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

    2. Disconnect the A47 skid control ECU (brake actuator assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A47-29 (HDCS) - F41-4 (B) Always Below 1 Ω
      A47-29 (HDCS) or F41-4 (B) - Body ground Always 10 kΩ or higher
      F41-1 (E) - Body ground Always Below 1 Ω

      Tech Tips

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

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR