VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1379

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

DESCRIPTION


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

  • CRAWL ON/OFF switch / CRAWL speed selector switch (Suspension control switch)*1

  • CRAWL ON/OFF switch / CRAWL speed selector switch / multi-terrain select mode switch*2 (integration control and panel assembly)*3

  • Harness or connector

  • Skid control ECU (Master cylinder solenoid)

WIRING DIAGRAM

B001Y0UE12
w/o Entry and Start System
*1 HSW
*2 ATRC
*3 CRAWL ON/OFF Switch / CRAWL Speed Selector Switch (Suspension Control Switch)
*4 Skid Control ECU (Master Cylinder Solenoid)
B001Y0UE13

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. INSPECT SUSPENSION CONTROL SWITCH OR INTEGRATION CONTROL AND PANEL ASSEMBLY


    1. w/o Entry and Start System:


      1. Remove the CRAWL ON/OFF switch / CRAWL speed selector switch (suspension control switch) Click here.

      2. Inspect the CRAWL ON/OFF switch / CRAWL speed selector switch (suspension control switch) Click here.

    2. w/ Entry and Start System:


      1. Remove the CRAWL ON/OFF switch / CRAWL speed selector switch / multi-terrain select mode switch* (integration control and panel assembly) Click here.

      2. Inspect the CRAWL ON/OFF switch / CRAWL speed selector switch / multi-terrain select mode switch* (integration control and panel assembly) Click here.


      • *: w/ Multi-terrain Select

      Result
      Result Proceed to
      OK A
      NG (w/o Entry and Start System) B
      NG (w/ Entry and Start System) C

    B

    REPLACE SUSPENSION CONTROL SWITCH Click here

    C

    REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY Click here

    A

  2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SUSPENSION CONTROL SWITCH OR INTEGRATION CONTROL AND PANEL ASSEMBLY)


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

    2. w/o Entry and Start System:


      1. Disconnect the V4 CRAWL ON/OFF switch / CRAWL speed selector switch (suspension control switch) connector.

    3. w/ Entry and Start System:


      1. Disconnect the V8 CRAWL ON/OFF switch / CRAWL speed selector switch / multi-terrain select mode switch* (integration control and panel assembly) connector.


        • *: w/ Multi-terrain Select

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

      Standard Resistance
      w/o Entry and Start System:
      Tester Connection Condition Specified Condition
      A24-44 (TRM1) - V4-18 (SWO2) 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 (SWO4) Always Below 1 Ω
      A24-13 (ATRC) - Body ground Always 10 kΩ or higher
      V4-16 (E) - Body ground Always Below 1 Ω
      w/ Entry and Start System:
      Tester Connection Condition Specified Condition
      A24-44 (TRM1) - V8-15 (SWO2) Always Below 1 Ω
      A24-44 (TRM1) - Body ground Always 10 kΩ or higher
      A24-43 (TRS) - V8-16 (HSW) Always Below 1 Ω
      A24-43 (TRS) - Body ground Always 10 kΩ or higher
      A24-21 (TRM2) - V8-14 (ECU2) Always Below 1 Ω
      A24-21 (TRM2) - Body ground Always 10 kΩ or higher
      A24-13 (ATRC) - V8-13 (SWO4) Always Below 1 Ω
      A24-13 (ATRC) - Body ground Always 10 kΩ or higher
      V8-10 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK TEST MODE DTC


    1. w/o Entry and Start System:

      Perform the CRAWL ON/OFF switch / CRAWL speed selector switch (suspension control switch) check in the Test Mode procedure Click here.

    2. w/ Entry and Start System:

      Perform the CRAWL ON/OFF switch / CRAWL speed selector switch / multi-terrain select mode switch (integration control and panel assembly) 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

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    REPLACE MASTER CYLINDER SOLENOID Click here