Troubleshooting
A -- Continue to next step.
2. CHECK ECM
(a) Check if the part number of the installed ECM is correct.
OK:
An ECM with the correct part number is installed.
NG -- REPLACE ECM See: Powertrain Management/Computers and Control Systems/Engine Control Module/Service and
Repair/Removal
OK -- REPLACE SUSPENSION CONTROL ECU
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 See: Accessories
and Optional Equipment/Antitheft and Alarm Systems/Diagrams/Diagnostic Aids/How To Troubleshoot ECU Controlled
Systems/How To Proceed With Troubleshooting; 2) DTC inspection See: Steering and Suspension/Suspension/Testing and
Inspection/Reading and Clearing Diagnostic Trouble Codes; and 3) Techstream inspection (Data List or Active Test) See:
Steering and Suspension/Suspension/Testing and Inspection/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 See: Steering and Suspension/Suspension/Suspension Control ( Automatic - Electronic
)/Testing and Inspection/Calibration and See: Steering and Suspension/Suspension/Suspension Control ( Automatic -
Electronic )/Testing and Inspection/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.
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