Vehicle Stability Control System (For Vacuum Brake Booster) Trc Off Indicator Light Remains On


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN COMMUNICATION SYSTEM

INSPECT VSC OFF SWITCH

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - VSC OFF SWITCH)

READ VALUE USING INTELLIGENT TESTER (TRC/VSC OFF MODE)

VEHICLE STABILITY CONTROL SYSTEM (for Vacuum Brake Booster) - TRC OFF Indicator Light Remains ON


DESCRIPTION

The skid control ECU is connected to the combination meter via the CAN communication system.
Pressing the VSC OFF switch turns off traction control and pressing and holding this switch turns off traction and VSC controls. If traction control turns off, the TRC OFF indicator light comes on.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System.Vehicle Stability Control System (For Vacuum Brake Booster) Trc Off Indicator Light Remains On


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the brake actuator assembly, perform calibration (LandCruiser RM000000XHR0BKX.html).
  2. As there may be malfunctions in the transfer system related to when the transfer operates in L4, check the transfer system first (LandCruiser RM0000030AI01JX.html).
1.CHECK CAN COMMUNICATION SYSTEM

  1. Check if CAN communication system DTCs are output (for LHD without Entry and Start System: LandCruiser RM000000WIB0EDX.html, for LHD with Entry and Start System: LandCruiser RM000000WIB0ECX.html).

    Result
    Result
    		Proceed to
    DTC not output
    		A
    DTC output
    		for LHD without Entry and Start System
    		B
    DTC output
    		for LHD with Entry and Start System
    		C


B
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (LandCruiser RM000001RSO0BYX.html)

C
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (LandCruiser RM000001RSO0C5X.html)
A


2.INSPECT VSC OFF SWITCH

  1. Remove the VSC OFF switch (LandCruiser RM000001WZ2051X.html).



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System.Vehicle Stability Control System (For Vacuum Brake Booster) Trc Off Indicator Light Remains On

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    6 - 3
    		Switch is not pushed
    		10 kΩ or higher
    Switch is pushed
    		Below 1 Ω
    Text in Illustration
    *a
    		Component without harness connected
    (VSC OFF Switch)


NG
REPLACE VSC OFF SWITCH (LandCruiser RM000001WZ2051X.html)
OK


3.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - VSC OFF SWITCH)

  1. Disconnect the A6 skid control ECU connector.

  1. Disconnect the G9 VSC OFF switch connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A6-30 (CSW) - G9-6
    		Always
    		Below 1 Ω
    A6-30 (CSW) - Body ground
    		Always
    		10 kΩ or higher
    G9-3 - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.READ VALUE USING INTELLIGENT TESTER (TRC/VSC OFF MODE)

  1. Turn the ignition switch off.

  1. Connect the Intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

    ABS/VSC/TRC
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    TRC/VSC Off Mode
    		TRC/VSC off mode/ Normal, TRC OFF or VSC OFF
    		Normal: Normal mode
    TRC OFF: TRC OFF mode
    VSC OFF: VSC OFF mode
    		-

  1. Check that the mode display changes according to VSC OFF switch operation.

    OK:
    Display changes according to switch operation.


NG
REPLACE BRAKE ACTUATOR ASSEMBLY (LandCruiser RM0000034UX02TX.html)
OK

GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (LandCruiser RM000002Z4L055X.html)