Dtc C1792 Height Control Switch Circuit (Test Mode Dtc)

Suspension. Land Cruiser. Urj200, 202 Grj200 Vdj200
Suspension Control. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING GTS (HEIGHT CONTROL SWITCH (UP), HEIGHT CONTROL SWITCH (DOWN))

TEST MODE INSPECTION

INSPECT INTEGRATION CONTROL AND PANEL ASSEMBLY

CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - INTEGRATION CONTROL AND PANEL ASSEMBLY AND BODY GROUND)

DTC C1792 Height Control Switch Circuit (Test Mode DTC)


DESCRIPTION

This circuit sends a signal to the suspension control ECU in order to adjust the height to the selected height by the height control switch (integration control and panel assembly).

DTC Code
Detection Condition
Trouble Area
C1792
The test mode procedure is performed.
  1. Harness or connector
  2. Height control switch (integration control and panel assembly)
  3. Suspension control ECU

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1792 Height Control Switch Circuit (Test Mode Dtc)


INSPECTION PROCEDURE

NOTICE:
  1. Before performing troubleshooting, inspect the connectors of related circuits.
  2. If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed (Click here).
1.READ VALUE USING GTS (HEIGHT CONTROL SWITCH (UP), HEIGHT CONTROL SWITCH (DOWN))

  1. Turn the engine switch off.

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG) and the GTS on.

  1. Enter the following menus: Chassis / AHC / Data List.

  1. According to the display on the GTS, read the Data List.

    AHC
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Height Control Switch(Up)
    		Height control switch (Up) /
    ON or OFF
    		ON: Up button of the height control switch pushed.
    OFF: Height control switch not pushed.
    		-
    Height Control Switch(Down)
    		Height control switch (Down) /
    ON or OFF
    		ON: Down button of the height control switch pushed.
    OFF: Height control switch not pushed.
    		-
OK:
The GTS displays ON or OFF according to height control switch (integration control and panel assembly) operation.


NG
Go to step 3
OK


2.TEST MODE INSPECTION

  1. Refer to the Test Mode Procedure and perform the signal check. Check that test mode DTC C1792 is cleared (Click here).

    Result
    Result
    		Proceed to
    DTC C1792 is not cleared
    		A
    DTC C1792 is cleared
    		B


B
USE SIMULATION METHOD TO CHECK (Click here)
A

REPLACE SUSPENSION CONTROL ECU (Click here)

3.INSPECT INTEGRATION CONTROL AND PANEL ASSEMBLY

  1. Remove the height control switch (integration control and panel assembly) (Click here).

  1. Inspect the height control switch (integration control and panel assembly) (Click here).



NG
REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY (Click here)
OK


4.CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - INTEGRATION CONTROL AND PANEL ASSEMBLY AND BODY GROUND)

  1. Disconnect the K34 suspension control ECU connector.

  1. Disconnect the V8 height control switch (integration control and panel assembly) connector.

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

    Standard Resistance:
    Tester Connection
    		 Condition
    		Specified Condition
    K34-20 (UPSW) - V8-8 (HI)
    		Always
    		Below 1 Ω
    K34-20 (UPSW) or V8-8 (HI) - Body ground
    		Always
    		10 kΩ or higher
    K34-21 (DNSW) - V8-4 (LO)
    		Always
    		Below 1 Ω
    K34-21 (DNSW) or V8-4 (LO) - Body ground
    		Always
    		10 kΩ or higher
    V8-10 (E) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE SUSPENSION CONTROL ECU (Click here)