SUSPENSION CONTROL: AIR SUSPENSION SYSTEM (w/ AVS): TEST MODE PROCEDURE (2008 Sequoia)

TEST MODE PROCEDURE

1. TEST MODE PROCEDURE (SIGNAL CHECK)

HINT:

When entering the test mode, the suspension control ECU sets 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 ignition switch off.

(b) Check that the shift lever is in P.

(d) Turn the ignition switch to ON and the Techstream on.

(e) Enter the following menus: Chassis / Air suspension / Utility / Signal Check.

(f) The engine is started without stepping on the brake pedal.

(g) Check that the height control manual indicator light comes on for several seconds and then blink in Test Mode.

(h) Set each of the check items to the condition shown under Operation in the test mode table below.

Test Mode (Input Signal Check) Table

Check Item	Operation
Absorber control switch signal	Slowly move the absorber control switch "COMFORT" to "SPORT" and "COMFORT"
Height control switch signal	Press the height control switch "UP" first and then press "DOWN"
Height control mode select switch signal	ON to OFF (Height control mode select switch pushed)

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

(j) Check the malfunction using the code table below. After completing the test mode, disconnect the Techstream and turn the ignition switch off.

2. TEST MODE DTC CHART

HINT:

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

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

DTC Code	Diagnosis	Trouble Area
C1791	Absorber Control Switch Circuit	Absorber control switch Absorber control switch circuit Suspension control ECU
C1792	Height control switch circuit	Height control switch Height control switch circuit Suspension control ECU
C1793	Height control off switch circuit	Height control mode select switch Height control mode select switch circuit Suspension control ECU
C1796	Front Acceleration Sensor RH Malfunction	Front acceleration sensor RH Front acceleration sensor RH circuit Suspension control ECU
C1797	Front Acceleration Sensor LH Malfunction	Front acceleration sensor LH Front acceleration sensor LH circuit Suspension control ECU
C1798	Rear Acceleration Sensor Malfunction	Suspension control ECU