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 SUSPENSION CONTROL SWITCH OR INTEGRATION CONTROL AND PANEL ASSEMBLY

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

CHECK TEST MODE DTC

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


DESCRIPTION

  1. w/o Entry and Start System
    DTC C1379 is cleared when the CRAWL ON/OFF switch / CRAWL speed selector switch (suspension control switch) sends a CRAWL ON/OFF switch / CRAWL speed selector switch (suspension control switch) operation signal or when test mode ends.
  2. w/ Entry and Start System
    DTC C1379 is cleared when the CRAWL ON/OFF switch / CRAWL speed selector switch / multi-terrain select mode switch* (integration control and panel assembly) sends a CRAWL ON/OFF switch / CRAWL speed selector switch / multi-terrain select mode switch* (integration control and panel assembly) operation signal or when test mode ends.
    *: w/ Multi-terrain Select

DTC Code
DTC Detection Condition
Trouble Area
C1379
Stored only during test mode.
  1. CRAWL ON/OFF switch / CRAWL speed selector switch (Suspension control switch)*1
  2. CRAWL ON/OFF switch / CRAWL speed selector switch / multi-terrain select mode switch*2 (integration control and panel assembly)*3
  3. Harness or connector
  4. Skid control ECU (Master cylinder solenoid)
  1. *1: w/o Entry and Start System
  2. *2: w/ Multi-terrain Select
  3. *3: w/ Entry and Start System

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)


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 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).

  1. 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).

  1. *: 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.

  1. w/o Entry and Start System:

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

  1. 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.

      1. *: w/ Multi-terrain Select

  1. 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).

  1. 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


B
REPLACE MASTER CYLINDER SOLENOID (Click here)

C
REPLACE MASTER CYLINDER SOLENOID (Click here)
A

CHECK FOR INTERMITTENT PROBLEMS (Click here)