SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: TEST MODE PROCEDURE (2008 LX570)

TEST MODE PROCEDURE

1. TEST MODE PROCEDURE

HINT:

When entering the test mode, the suspension control ECU stores all the test mode DTCs first. After completing the test mode for each check item, the test mode DTCs that are determined to be normal by the suspension control ECU will be cleared. The test mode DTCs for other check items may not be cleared when only a certain signal is inspected.
When the test mode returns back to the normal mode, all the test mode DTCs will be cleared.

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(d) Enter the following menus: Chassis / AHC / Utility / Signal Check.

(e) Read the test mode DTCs by following the prompts on the Techstream screen.

(f) After completing the test mode, disconnect the Techstream and turn the engine switch off.

2. TEST MODE DTC CHART

HINT:

When entering test mode, the suspension control ECU outputs all the test mode DTCs. If the clear conditions for a test mode DTC are met, it is cleared.

If a trouble code is output during the test mode DTC check, check the circuit listed for that code. For details of each code, refer to the "See page" for the respective DTC code in the chart.

DTC Code	Detection Item	Trouble Area	Clear Condition
C1791	Damping mode select switch circuit malfunction	Harness or connector Integration control and panel (Damping mode select switch) Suspension control ECU	When each position (COMF/NORMAL/SPORT) of the damping mode select switch is detected.
C1792	Height control switch circuit malfunction	Harness or connector Integration control and panel (Height control switch) Suspension control ECU	When the height control switch up and down operation is detected.
C1794	Height control off switch circuit malfunction	Harness or connector Integration control and panel (Height control off switch) Suspension control ECU	When the signal of the height control OFF switch is detected.
C1795	Easy access mode switch circuit malfunction	Harness or connector Combination switch (Easy access mode switch) Suspension control ECU	When the signal of the easy access mode switch is detected.
C1796	Front acceleration sensor RH circuit malfunction	Front acceleration sensor RH Harness or connector Suspension control ECU	On a level surface, the G sensor input is +/-1.96 m/s² for 1 second.
C1797	Front acceleration sensor LH circuit malfunction	Front acceleration sensor LH Harness or connector Suspension control ECU
C1798	Rear acceleration sensor circuit malfunction	Suspension control ECU (houses rear acceleration sensor)