C0655

DTC C0655
Circuit Description
The automatic level control (ALC) adjusts the vehicle suspension ride height. The rear integration module (RIM) determines the height of the vehicle based on the voltage from the ALC sensor. The RIM grounds the compressor relay and the exhaust control solenoid to raise and lower the vehicle in order to keep the vehicle level.

DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0655 Level Control Compressor Circuit

Conditions for Running the DTC
^ The RIM is powered up.
^ DTCs B1328 and B1327 are not stored.

Conditions for Setting the DTC
The compressor relay output is found to be shorted to ground for 10 seconds.

Action Taken When the DTC Sets
The ALC will be inoperative.

Conditions for Clearing the MIL/DTC
The RIM does not detect a failure during the self test.

Diagnostic Aids
^ Inspect all wiring harnesses carefully for chaffs and proper routing. Refer to Testing for Intermittent Conditions and Poor Connections.
^ This circuit is monitored before every functional operation of the compressor relay output. If a compressor relay fault is detected, the RIM retries the output every 15 seconds to try to recover from the fault.

Test Description





The numbers below refer to the step numbers on the diagnostic table.
2. Listen for an audible click when the level control compressor relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
3. This step tests for voltage at the coil side of the level control compressor relay. The ELC fuse supplies power to the coil side of the level control compressor relay.
4. This step verifies that the RIM is providing ground to the level control compressor relay.
5. This step tests if ground is constantly being applied to the level control compressor relay.
6. This step tests for a short to voltage or an open.