Air Suspension

[LV_H2]

Can someone explain to me how the air suspension system on the H2 actually works?

Is it designed to "raise" the height of the vehicle, or just to level the vehicle under different loading conditions?

How does the button and the indicator light work? When pressed, the light and the air compressor come on, but then eventually the light goes off again. Is the system always on and the button just a manual reset?

Thanks!

[ROX]

Originally Posted by LV_H2

Can someone explain to me how the air suspension system on the H2 actually works?

Is it designed to "raise" the height of the vehicle, or just to level the vehicle under different loading conditions?

How does the button and the indicator light work? When pressed, the light and the air compressor come on, but then eventually the light goes off again. Is the system always on and the button just a manual reset?

Thanks!

This info is out of the owners manual. Check it out.

Selectable Extended Rear
Ride Height

If your vehicle has this feature it comes as part of the
electronically controlled air suspension system.
The selectable rear ride height allows you to raise the
rear of the vehicle about 2 inches (5 cm) over the normal
ride height. This can be helpful when driving off-road
where you may need more ground clearance to clear
an obstacle.
The button that controls
this feature is located
on the instrument panel
to the right of the
steering wheel.
To use this feature, ensure that the following conditions
are met:

?

The engine must be running.

?

All doors must be fully closed. The suspension will
not raise or lower if a door is open.

?

The vehicle speed must be less than 40 mph
(64 km/h). The system will not activate otherwise.
Press the height control button to raise the rear of
the vehicle.
A light in the button will begin to flash as the rear of the
vehicle rises. Once the extended height has been
reached (this may take up to a minute), the warning
light will stop flashing and will stay lit while the vehicle is
at the extended height.
To lower the vehicle to the normal ride height, press the
button again. The light in the button will flash as the
suspension lowers. When the light in the button stops
flashing and goes out, the suspension has reached
the normal ride height.
This feature will lower the vehicle to the normal height if
vehicle speed exceeds 40 mph (64 km/h).
You may also want to use this feature when ascending,
descending or cresting a steep hill as this can help
prevent the rear bumper from dragging on the base of
the hill or prevent the vehicle from grounding out
(high centering) on the crest of the hill.
Do not use this feature when towing a trailer.

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 level the
vehicle after loading or unloading. The system will
suspend leveling if any of the doors 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 5-67

.
4-66
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 3-43 for more information.

[LV_H2]

Thanks. So it is always in automatic leveling mode, and you can manually raise the back of the H2 by 2 inches with the button (and the light should stay on).

The service department at my Hummer dealership had it confused. I told them the light should stay on, signifying that the H2 is raised. Mine goes on briefly when pressed, the compressor runs, then the compressor stops and the light goes out. I told them it was broken, they told me that is how it works. It made no sense for the light to go out, as you then have no idea if you are raised up or not!

Another trip to the dealer....

[dochummer]

Good luck

[CD_Inc]

"In a nut shell", The light flashes untill the rear has been lifted. Mine sometime seems like it tries to level out sometimes. This is normal. When the button is depressed the light will flash and the airbags are inflated. Don't open the doors or the process will stop, and go slow until it's finnished.

[Medicine Man]

When you say normal does that mean its normal for it to try and level itself when you pull into a driveway or something like that? Mine always cycles itself when I pull into or out of my driveway. I will also hear it sometimes for no reason I believe.

[blockrockin]

it comes on to keep it level so it comes on and off everyonce inwhile while you are driving.. that normal.. if its on all the time or very offten then their is probably a hole in the air bags..