Automatic Level Control (ALC) System
The ALC system controls the ride height of the rear of the vehicle via a compressor with an integral exhaust solenoid valve. The system consists of the following components:
| • | Two air assisted shock absorbers |
| • | One level sensor with an integrated control module, located under the body |
| • | A compressor with an integral exhaust solenoid valve |
| • | A compressor relay |
The level sensor senses the height of the rear of the vehicle. The level sensor compares the height with a desired trim height that is programmed into the level sensor's memory. If the vehicle is higher than desired, the exhaust valve energizes. If the vehicle is lower than desired, the compressor relay energizes in order to activate the compressor assembly.
The leveling indicator light performs a 4 second bulb test when the ignition is switched to the ON position.
The leveling indicator light illuminates when an extreme load condition is present. When an extreme load condition is present a potential rear suspension clearance problem may exist. The light goes out when the leveling is complete.
The leveling indicator light does not illuminate during normal leveling cycles.
