Up to 08/2009

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1792: Height Control Switch Circuit (Test Mode DTC)
C1792 - Height Control Switch Circuit (Test Mode DTC)

DESCRIPTION

Pressing the height control switch (driver seat) while the engine is running for approximately 1 second switches modes. If the switch is pressed while the vehicle height is changing, vehicle height control will be cancelled.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
- Before performing troubleshooting, inspect the connectors of related circuits.
- Before replacing the suspension control ECU, perform all of the following again: 1) symptom simulation How To Proceed With Troubleshooting; 2) DTC inspection Reading and Clearing Diagnostic Trouble Codes; and 3) Techstream inspection (Data List or Active Test) Scan Tool Testing and Procedures. If no malfunctions are found in other areas, replace the suspension control ECU.
- If the suspension control ECU is replaced, the vehicle height offset calibration and registration of vehicle identification information must be performed Calibration and Registration)
PROCEDURE

1. INSPECT HEIGHT CONTROL SWITCH (DRIVER SEAT)

(a) Disconnect the height control switch (driver seat) connector.





(b) Measure the resistance according to the values in the table below.

Standard resistance:





Text in Illustration





NG -- REPLACE HEIGHT CONTROL SWITCH (DRIVER SEAT)
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL SWITCH - ECU AND BODY GROUND)

(a) Disconnect the A56 ECU connector.





(b) Disconnect the F24 height control switch (driver seat) connector.

(c) Measure the resistance according to the values in the table below.

Standard resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE SUSPENSION CONTROL ECU