Air Suspension

DTC C0712

Circuit Description

The air suspension compressor motor is switched ON and OFF via an air suspension relay which is controlled by the air suspension control module. The air suspension control module provides a switched path to voltage whenever compressor activity is required. The air suspension control module monitors the compressor motor relay circuity to determine if the voltage level agrees with the command state.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C0712 Level Control Compressor Relay Circuit

This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description.





Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

Air suspension control module senses relay circuitry voltage does not agree with command state.

Action Taken When the DTC Sets

* Air suspension functionality is suspended.
* SERVICE SUSPENSION message is displayed.

Conditions for Clearing the DTC

The DTC will clear when the condition for setting the DTC is removed.

Diagnostic Aids

This DTC is set when the compressor relay circuitry is shorted to ground, voltage, and open.

Test Description

The numbers below refer to the step numbers on the diagnostic table.
2. During the air suspension relay operation, listen for an audible click. Command the ON and the OFF states. Repeat the commands as necessary.
3. This step verifies that the air suspension control module is providing voltage to the air suspension relay.
4. This step tests for an open in the ground circuit to the air suspension relay.
5. This step tests for constant voltage to the air suspension relay.

Step 1 - Step 11:

Step 12 - Step 13: