Dtc C1379 Downhill Assist Control Switch Malfunction (Test Mode Dtc)

Brake. Land Cruiser. Urj200, 202 Grj200 Vdj200
Brake Control Dynamic Control Systems. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT CRAWL SWITCH

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

CHECK TEST MODE DTC

DTC 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.
  1. CRAWL switch (Suspension control switch)
  2. Harness or connector
  3. Skid control ECU (Master cylinder solenoid)

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1379 Downhill Assist Control Switch Malfunction (Test Mode Dtc)


INSPECTION PROCEDURE

NOTICE:
After replacing the master cylinder solenoid, perform zero point calibration and store the system information (Click here).
1.INSPECT CRAWL SWITCH

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

  1. 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.

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

  1. 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)