VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1379

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

DESCRIPTION

DTC C1379 is cleared when the CRAWL switch (suspension control switch) sends a CRAWL switch (suspension control switch) operation signal or when test mode ends.

DTC Code DTC Detection Condition Trouble Area
C1379 Stored only during test mode.

  • CRAWL switch (Suspension control switch)

  • Harness or connector

  • Skid control ECU (Master cylinder solenoid)

WIRING DIAGRAM

A015D8ZE01

INSPECTION PROCEDURE

Note

After replacing the master cylinder solenoid, perform zero point calibration and store the system information Click here.

PROCEDURE


  1. INSPECT CRAWL SWITCH


    1. Remove the CRAWL switch (suspension control switch) Click here.

    2. Inspect the CRAWL switch (suspension control switch) Click here.


    NG

    REPLACE SUSPENSION CONTROL SWITCH Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - CRAWL SWITCH)


    1. Disconnect the A24 skid control ECU (master cylinder solenoid) connector.

    2. Disconnect the V4 CRAWL switch (suspension control switch) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A24-44 (TRM1) - V4-18 (ECU1) Always Below 1 Ω
      A24-44 (TRM1) - Body ground Always 10 kΩ or higher
      A24-43 (TRS) - V4-14 (HSW) Always Below 1 Ω
      A24-43 (TRS) - Body ground Always 10 kΩ or higher
      A24-21 (TRM2) - V4-19 (ECU2) Always Below 1 Ω
      A24-21 (TRM2) - Body ground Always 10 kΩ or higher
      A24-13 (ATRC) - V4-13 (ECU3) Always Below 1 Ω
      A24-13 (ATRC) - Body ground Always 10 kΩ or higher
      V4-16 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK TEST MODE DTC


    1. Perform the CRAWL switch check in the Test Mode procedure Click here.

      OK
      Test mode DTC C1379 is cleared.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    REPLACE MASTER CYLINDER SOLENOID Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here