GM Service Manual Online
For 1990-2009 cars only

Load Leveler System Check

Step

Action

Normal Result(s)

1

Turn ON the ignition, with the engine OFF.

Important: The following results may be different if weight has been added to or removed from the vehicle.

After approximately 35-55 seconds, the air compressor runs for 3-5 seconds, then stops (air replenishment cycle).

2

Add approximately 180 kg (400 lb) to the rear of the vehicle.

  1. During (or 17-27 seconds after) the loading of the vehicle, the system exhausts for 1 second, then the compressor motor turns on.
  2. Within 1 minute, the rear of the vehicle rises in order to reach the proper trim height.
  3. The compressor turns off.

3

Remove the weight from the rear of the vehicle.

  1. During (or 17-27 seconds after) the unloading of the vehicle, the system exhausts.
  2. The rear of the vehicle lowers the vehicle.
  3. The ALC system retains a minimum pressure of 55-97 kpa (8-14 psi).

Inflator System Check

Step

Action

Normal Result(s)

1

  1. Turn On the ignition, with the engine OFF.
  2. Press the inflator ON button.
  1. The compressor runs.
  2. After 10 minutes, the compressor stops.

2

Measure the air pressure at the inflator valve.

During compressor operation, approximately 483 kpa (70 psi) of air pressure is available at the inflator valve.

3

Press the inflator off button.

The compressor stops.