Hummer 2004 H2 User Manual download pdf (Page 300)

100

101

Electronically Controlled Air

Suspension System

The electronically controlled air suspension, if equipped,

keeps the rear of your vehicle level as you load and

unload it. The system includes a compressor, two height

sensor and two air springs supporting the vehicle.

The engine must be running for the system to operate

and level the vehicle after loading or unloading. The

system will suspend leveling if any of the doors and/or

the liftgate are open. Once the doors are closed,

system leveling will continue.

You may hear the compressor running when you load

your vehicle, and periodically as the system adjusts

the vehicle to the standard ride height. You may

also hear the release of air similar to a hissing sound

during suspension operation. This is normal.

Load leveling will not function normally with the inﬂator

hose attached to the inﬂator outlet. Remove the

inﬂater hose from the outlet when it is not in use. See

Accessory Inﬂator on page 5-76.

Overload and Overheat Protection

Overload protection is designed to protect the air

suspension system and is an indication to the driver that

the vehicle is overloaded.

If the rear suspension remains at a low height, the rear

axle load has exceeded GAWR (Gross Axle Weight

Rating). When the overload protection mode is activated,

the compressor operates for about 30 seconds to one

minute without raising the vehicle depending on the

amount of overload. This will continue each time

the ignition is turned on until the rear axle load is

reduced below GAWR.

If the total rear GAWR (Gross Axle Weight Rating) is

reached, the suspension may be slightly less than level.

This is normal and does not mean there is a problem

with the air suspension.

If the system overheats, it will shut down and stop all

leveling functions until the system cools down.

During this time the SERVICE AIR SUSPENSION

message will appear in the DIC. See Driver Information

Center (DIC) on page 3-44 for more information.

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Hummer 2004 H2 User Manual Page 300

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