Dtc C1794/94 Height Control Off Switch Circuit (Test Mode Dtc)


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT CENTER CLUSTER MODULE SWITCH

CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - CENTER CLUSTER MODULE SWITCH)

DTC C1794/94 Height Control OFF Switch Circuit (Test Mode DTC)


DESCRIPTION

If the height control OFF switch is pressed when the vehicle is stopped with the engine running or the ignition switch ON, vehicle height control is disabled and remains disabled even after the ignition switch is turned off. Pressing the height control OFF switch again with the engine running or the ignition switch ON resumes vehicle height control. If the vehicle speed reaches approximately 30 km/h (19 mph) when vehicle height control is disabled, vehicle height control automatically resumes.

DTC Code
DTC Detection Condition
Trouble Area
C1794/94
Stored only during test mode.
  1. Height control OFF switch (Center cluster module switch)
  2. Harness or connector
  3. Suspension control ECU

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Suspension Control.Air Suspension System. Dtc C1794/94 Height Control Off Switch Circuit (Test Mode Dtc)


INSPECTION PROCEDURE

NOTICE:
When replacing the suspension control ECU, perform registration (LandCruiser RM000003X4500TX.html).
1.INSPECT CENTER CLUSTER MODULE SWITCH

  1. Remove the height control OFF switch (center cluster module switch) (LandCruiser RM000003W2Z010X.html).



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Suspension Control.Air Suspension System. Dtc C1794/94 Height Control Off Switch Circuit (Test Mode Dtc)

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    5 (N) - 24 (E)
    		Height control OFF switch pressed
    		Below 1 Ω
    Height control OFF switch not pressed
    		10 kΩ or higher
    Text in Illustration
    *a
    		Component without harness connected
    (Height Control OFF Switch (Center Cluster Module Switch))


NG
REPLACE CENTER CLUSTER MODULE SWITCH (LandCruiser RM000003W2Z010X.html)
OK


2.CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - CENTER CLUSTER MODULE SWITCH)

  1. Disconnect the A49 suspension control ECU connector.

  1. Disconnect the G156 height control OFF switch (center cluster module switch) connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A49-13 (TD) - G156-5 (N)
    		Always
    		Below 1 Ω
    A49-13 (TD) or G156-5 (N) - Body ground
    		Always
    		10 kΩ or higher
    G156-24 (E) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE SUSPENSION CONTROL ECU (LandCruiser RM000002BGR01UX.html)