Electronically Controlled Air Suspension System - GMC 2007 Envoy Denali Owner's Manual

Electronically Controlled Air
Suspension System
Your vehicle may be equipped with an electronically
controlled air suspension system that automatically
keeps your vehicle level as you load and unload.
The system includes a compressor, two height
sensors and two air springs supporting the
rear axle.
The system also has an internal clock to prevent
overheating if the inflator is used for prolonged
periods. If the system overheats, all leveling
function stops until the system cools down.
During this time, the indicator light on the air
inflator switch will be flashing.
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The ignition has to be on for the system to inflate,
in order to raise the vehicle to the standard ride
height after loading. The system can lower
the vehicle to the standard ride height after
unloading with the ignition on and also for up to
30 minutes after the ignition has been turned off.
You may hear the compressor operating when you
load your vehicle, and periodically as the system
adjusts the vehicle to the standard ride height.
Load leveling will not function normally with the
inflator hose attached to the inflator outlet. Remove
the inflator hose from the outlet during loading
and unloading.
If the vehicle is parked for an extended period of
time, some bleed down of the suspension is
normal. Upon starting the vehicle, proper height
will be achieved.