Air ride button on the dash H2
 

Ok, here's what I got. I had a tire that was almost flat so I got the air hose out and tried to use it, when I pushed the button in on the right rear compartment of the hummer nothing happened so I changed the tire when I got in to drive off the "SERVICE AIR SUPENSION" came on.
Sense then I have noticed that when I turn the key on the compressor will pump 3 or 4 time and then stop no big deal but the button on the dash and the one in the rear compartment for tires and what not have stopped working the Hummer seems to be lower than it should be and I don't here it adjusting like it use too it's not all the way down and the ride seems to OK. I haven't found any leaks in the bags or the air lines. Just another H2 mystery. Is there a relay that is controled by these 2 switches any wiring diagrams. Thanks Russ:confused:

Good luck finding a wiring relay. It may be that the switch is bad on the tire pump.location. If you have not used it before it could have a bad contact. I would try turning off and on a few times.

Don't know if your concerns are related. In order for the rear air pump to be used, the key has to be in the "on" position to power the air pump, thus sending power to the rear switch to operate the air pump. Can't remeber if it matters if the engine needs to be running, or if it's just a key "on" position. If the key is in the acc or off position, there won't be any power sent to the rear inflator switch.

The only air suspension switch on the dash, that i'm aware of from looking at mine, is the little switch above the center console that has an up and down lookin arrow next to a pic of the rear of the hummer. (hope i'm making sense here), which when pushed, will inflate the rear air bags and give xtra height to the rear of the H2. According to the owner's manual, this will only work under speeds of 10mph ( I think thats what it said), as it's speed dependent and meant for slow speed off road travel. If you exceed the speed of the operation, the air will be released to lower the rear-end of the H2 back to the auto-factory setting.

As far as the Air Suspension light or message being displayed, look to make sure that you didn't bump or damage the sensor or wiring located in the wheel well, on top of the frame by the rear wheels. Just by changing the tire with a spare, it shouldn't affect the auto air suspension, unless ofcourse you're putting a totally different size of spare on.

The engine does have to be running in order for the compressor to operate. Most of the relays are located in the engine compartment, driver side in a little box that you take the lid off to access.

If you find the compressor relay try swapping it out with another relay, just make sure the part #'s are the same.

Don't know if its related or not, but my Service Air Suspension message came on just recently. Took it to the Hummer dealer to diagnose, and they said my L.R. ride sensor connector was bad. $95 bucks for the sensor connector. Part came in and I just need to pick it up and replace it. Being a dealer tech for many years, (Ford) I always question a connector issue, so i'll be checking the wiring loom and sensor pins to see if maybe the connector was a shotgun guess, or needed replaced due to issues seen in the field.

Mine is a 03 when I raise the air bags, they will stay at the raised height until I lower it. The speed limit is only to raise it. example it will not raise if you are going over 20 mph I drive at speeds with it raised a lot of times.

It will deflate at 45mph back to normal.

Dam sorry everyone for not responding back to my problem. I replaced the connector per the dealer and it did not fix the problem. After I replaced the connector, and turned on the system (key-on), I thought it had been fixed until I was fiddling with the wire loom coming from the new connector. As I moved the wiring/connector, I could hear a "clicking" noise. I then lightly grabbed the leveling arm from the sensor and the clicking got even worse. Not enough to move the lever, but just enough wiggling to get the clicking noise to get even worse.

Ended up buying a level sensor and after the replacement I haven't had any issues.

I guess nobody read the manual... the Extended Ride Height button on the dash raises the rear body 2 inches above the stock ride height. WHEN THE TRUCK REACHES 40 MPH, not 10, not 20, but 40 MPH, the Extended Ride Height will disengage and the light will blink while letting the extra air out of the rear bags. Once the frame reaches the stock run height, the light will go out.

How to over-ride the extended ride height at 40 mph????
 

What I want to know is how to STOP the automatic EXTENDED HEIGHT aka airbag discharge when the truck reaches 40 mph. I want it to STAY UP at ALL SPEEDS.

You cannot disable that unless you can find some way to first extract the firmware for the AS (air suspension module), decompile the software, hack it, recompile it, and write it back to the module. One catch also is where that specific bit of code is - that code could be in the AS module, or it could be in the BCM or PCM and one of those then just sends a signal to the AS module to lower back down. I can see why GM does it though as the center of gravity increases the risk of a turnover and at higher speeds a gust of wind or sudden swerve to avoid something might be disastrous so GM doesn't want liability for that.

Most any other workarounds will cause other issues. If you disconnect or disable the vehicle speed sensors at the wheels your ABS, traction control system, and other systems will stop working and cause all sort of error messages.

I think about the only way you would get around it would be to heavily modify the air ride system to use an aftermarket control. While not thinking of it for the idea of being able to drive above 40mph with the rear raised up this is something that I've been considering as a mod I'd like to do. My thought is there is plenty of room underneath along the frame to add an air tank or two. Use the compressor platform itself, the air ride height sensors, but my own much better and higher capacity compressor and controller. The air ride sensors are quite simple and are just a variable resistor (factory uses a 5V reference and it can vary from about .25v to about 4.75v with the center around 2.5v). Aftermarket air ride systems like on ambulances and other vehicles work using the same principles. Some even just using an analog lever that opens or closes valves to keep the ride height in the center point while higher end setups with in cab controls can use actual little air lines to physical switches or electronically controlled. I'd like to be able to occasionally use air tools if needed, air horns, and be able to inflate a tire or something much quicker than the stock compressor allows for. Also with manual control over the rear air bags as well to raise to a maximum level that the bags can go to without any risk of damage as well as lowering below stock height if desired for something. Longer term - would be awesome to add air adjustable shocks to the front and be able to raise/lower the front some as well. One important point for me though - I have zero desire to slam an H2 to the ground or put tiny hard as a rock rubber band tires on gigantic wheels on it.... lol On the idea of lowering the entire thing some, I'd probably only do that on an interstate road trip.

Thanks for your response! I like your idea of a stronger compressor and larger tank to run pneumatic tools. An impact wrench and a pneumatic bottle jack might be nice for a quick tire change or lift during long trips... especially for old farts like myself.

Speaking of Road Trips... We left our home state of Nevada Sept.9th for a 8,400 mile, 22 state, 2 month Road Trip around America.

Yellowstone was one of the first National parks we visited, but we explored many others, including but not limited to, Custer Battlefield National Monument, Grand Teton National Park, Devil's Tower National Monument, Mount Rushmore, Crazy Horse on Thunder Mountain, Sturgis, the Black Hills/BADLANDS, the Smokey Mountains, Nashville, the Biltmore Estate/Vanderbilt Mansion, MAYBERRY RFD aka Mount Airy, NC. Spent three weeks in and around the Chesapeake Bay of Maryland and Virginia where I was born and grew up tonging oysters and potting crabs,

Then we headed back to Nevada along I-10, where we spent three days in Kitty Hawk/Kill Devil Hills, site of Orville and Wilber Wright's FIRST FLIGHT, then three days on Hatteras Island, THE CAPE and made a dash through New Orleans, Mississippi and Texas where we got blasted by an ICE STORM at the US./ Mexican border, before sneaking through New Mexico... was under heavy quarantine, they strongly discouraged anyone from Texas or Nevada to travel through, so we SELF-QUARANTINED OURSELVES in the Hummer the entire four hour race to Arizona, then back to Nevada where we could kick off our driving shoes and sleep for two days to recover.

We learned a lot about Covid 19 on the trip, some states have no restrictions at all and many states are totally locked down and have 14 day mandatory quarantines in each state for folks from Nevada, since we have a higher than 10% positive test rate.

But, we also found out there are so many people traveling, that it was almost impossible to find rooms and campgrounds ANYWHERE. Montana, Wyoming and the Dakotas were SOLD OUT. The two motel rooms available in Jackson Hole, Wyoming were $500 and $800 each for one night stay, the only two rooms in town. Campgrounds in Yellowstone were even worse, NONE! A friendly NPS Park Ranger let us stay in the NPS Campsite for the night.

One thing I should have realized... NEVER, EVER attempted an 8,400 mile road trip, traveling often at 80 mph on Interstates with M Rated tires... My Kevlar tires CUPPED which made for a bumpy ride from North Carolina to Maryland, but after a tire rotation and alignment, they felt much better on the 3,400 mile trip back to Nevada.

https://www.facebook.com/photo?fbid=....1223078310668

http://dizeman.com/kong/4humcoronor.jpg

My tires... Great for around town and the Boonies, but... Cross country, not so much.

Nice!

Air Ride Button
 

New O8 H2 w/ air ride. How do I function the button to raise or lower the air suspension? Is it all or nothing. When I depress do I turn off after raising / lowering. Dealership where purchased has no idea? I dont wont to break something. Thanks

https://cimg8.ibsrv.net/gimg/www.hum...0f11d7cca7.png

If you have you manual to hand it is explained in there, anyway here it is ('05 copy) :-

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.

Hope this helps :)