For 1990-2009 cars

Step | Action | Normal Result(s) | Abnormal Result(s)*
--- | --- | --- | ---
1 | Turn the ignition switch to the ON position. | After approximately 35-55 seconds, the air compressor runs for 3-5 seconds. NOTE: This action may be overridden by the height sensor if a load has been added or removed from the vehicle. |

• | The air compressor cycles on and off frequently. If no air leaks are present, go to Rear of Vehicle Low .

• | The air compressor runs excessively. Inspect for a disconnected or damaged air tube or a damaged shock absorber. If OK, go to Rear of Vehicle Low .

2 | Add a 300 lb. load to the luggage compartment. | After a 17-27 second delay, the air compressor runs and the rear of the vehicle rises to the correct trim height. Refer to Trim Height . |

• | The air compressor cycles on and off frequently. If no air leaks are present, go to Rear of Vehicle Low .

• | The air compressor runs excessively. Inspect for a disconnected or damaged air tube or a damaged shock absorber. If OK, go to Rear of Vehicle Low .

3 | Turn the ignition switch to the OFF position. Remove the load from the luggage compartment. | After a 17-27 second delay, a hiss of escaping air may be heard, and the rear of the vehicle lowers to the correct trim height. Refer to Trim Height . | After a 17-27 second delay, the rear of the vehicle remains above the correct trim height. Refer to Rear of Vehicle High .
* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.