Air susp light on

[compose]

Had the rotors in the rear changed out a week ago. Am not sure if the mechanic turned off the suspension system when raising the rear of the car. How do I go about resetting the system?

[fastblackmerc]

Had the rotors in the rear changed out a week ago. Am not sure if the mechanic turned off the suspension system when raising the rear of the car. How do I go about resetting the system?


What's wrong with it that it has to be reset?

[Gordy]

Had the rotors in the rear changed out a week ago. Am not sure if the mechanic turned off the suspension system when raising the rear of the car. How do I go about resetting the system?


They turned it off when they put it on the lift, switch is in the trunk on the left, just flip it back on.

[compose]

i can feel the difference when i drive. felt it today, have not driven it since last week. checked the switch and it was on. was wondering if maybe i lift the rear with the switch off and lower it and put it back on it'll reset.

[fastblackmerc]

i can feel the difference when i drive. felt it today, have not driven it since last week. checked the switch and it was on. was wondering if maybe i lift the rear with the switch off and lower it and put it back on it'll reset.

I'd turn it off, wait a few minutes, turn it on, start the car, turn off the car and see what happens. The system should either vent or pump up.

[Gordy]

Hopefully they did not leave it on when they lifted it

[fastblackmerc]

Hopefully they did not leave it on when they lifted it

They most likely did. Unless you've worked on a MM before you wouldn't have a clue. The system won't get damaged, but the car might shift on the lift.... and that could be a problem. :eek:

[compose]

thanks guys i'll try that..

[Gordy]

They most likely did. Unless you've worked on a MM before you wouldn't have a clue. The system won't get damaged, but the car might shift on the lift.... and that could be a problem. :eek:

Ya, never tested it. Heard enough horror stories that when anything that looks like a grandma luxury car comes in we just take a quick look and turn it off it has it. Never had a problem.

[RF Overlord]

From an excellent article at lincolnsonline (http://www.lincolnsonline.com/tech/00061.html)

When the car is started the air suspension module will immediately raise the vehicle to trim height if needed. No venting is allowed for 45 seconds after starting, so if the vehicle is high it will remain high for at least 45 seconds. Venting is also not allowed when a door is open. When the car is moving the module uses a 45 second averaging procedure to control trim height. This means that unless the module receives a high or low signal continuously for 45 seconds no adjustments are made. If the car is stopped and a door is opened and closed an immediate trim height adjustment will be made.

If during a lowering or raising procedure trim height cannot be achieved in the "time out" period, the "Check Suspension" light will illuminate and the air suspension module will turn off. When the ignition is turned off and back on the air suspension module will return to normal operation and try to maintain trim height. The "Check Suspension" light is also illuminated when the air suspension is switched off using the on/off switch.

After switching the car off the air suspension remains active for one hour. From 0 - 59 minutes only venting is allowed providing all doors are closed. At 60 minutes, if trim height is low, the module will raise the car to trim height or run the compressor for 23 seconds if this is not achieved. At 61 minutes the air suspension system is switched off.

[Vortech347]

From an excellent article at lincolnsonline (http://www.lincolnsonline.com/tech/00061.html)

When the car is started the air suspension module will immediately raise the vehicle to trim height if needed. No venting is allowed for 45 seconds after starting, so if the vehicle is high it will remain high for at least 45 seconds. Venting is also not allowed when a door is open. When the car is moving the module uses a 45 second averaging procedure to control trim height. This means that unless the module receives a high or low signal continuously for 45 seconds no adjustments are made. If the car is stopped and a door is opened and closed an immediate trim height adjustment will be made.

If during a lowering or raising procedure trim height cannot be achieved in the "time out" period, the "Check Suspension" light will illuminate and the air suspension module will turn off. When the ignition is turned off and back on the air suspension module will return to normal operation and try to maintain trim height. The "Check Suspension" light is also illuminated when the air suspension is switched off using the on/off switch.

After switching the car off the air suspension remains active for one hour. From 0 - 59 minutes only venting is allowed providing all doors are closed. At 60 minutes, if trim height is low, the module will raise the car to trim height or run the compressor for 23 seconds if this is not achieved. At 61 minutes the air suspension system is switched off.

Great info. I have always wondered how our systems work. On a side note other panther cars came with this suspension. Almost every time my car has needed to get on a lift they turn off the air suspension, even if I forget to tell them.

[compose]

it did not work. the air susp light came on after a quick drive. it's bouncing all over the place. now that i see the car the back looks low. any ideas?

[RF Overlord]

Check the ride-height sensor. It's common for the sensor to get bound up and have the actuating linkage pop off. Unfortunately, lubing the sensor won't fix it...it needs to be replaced. On the bright side, they aren't expensive and are easy to do.

[Chi Stallion]

Replace the air compressor with the aftermarket Arnett air compressor and see how it goes from their... If the problem doesnt go away replace the rear air bags with the aftermarket Arnett air bags and problem should go away. If you wanna be done with it just buy the whole kit from the Arnett website.

[RF Overlord]

Before you go advising he replace expensive air compressors and air bags, a little more troubleshooting is in order.

..and it's Arnott.

[MyO4Rawdur]

Do you hear the compressor running? If not then chances are thats what it is. When you first start the car is the susp light on ? If yes id go for that. Grab one from an older GM at a you pull it yard and if they ask what it is just say you dont know and that your mechanic just showed you where it is. Probably like $25 and worst case you have a spare.

[Chi Stallion]

Before you go advising he replace expensive air compressors and air bags, a little more troubleshooting is in order.

..and it's Arnott.

Yes I did spell it wrong sorry. This car has been out in the wild for 10 years I'm sure the air compressor is pretty beat if the car hasnt been stored all its life in a garage. Thats my opinion.


Sent from my iPhone 5 using Tapatalk

[compose]

thank, would anyone know where it's located?

[MyO4Rawdur]

Right below the air box front right behind headlight

[compose]

okay, but how about the ride height sensor?

[RF Overlord]

Above the rear axle, on the driver's side.

[compose]

ok will check it out, thanks..

[compose]

one last question how many air suspension bags does the marauder have, just the two in the back?

[MyO4Rawdur]

Yes just two

[whitey]

Buy a new compressor if you need it, the problem with junk yard compressors is that you have no way of telling if the dryer on the compressor is shot which would allow moisture into the system. Moisture will kill the airbags. Arnott has them for $200 last i recall, and it comes with a new dryer. Also, in order to get the air line off the old compressor you need to push in the lock ring, and pull the line at the same time , dont cut it ...like i did.

[MyO4Rawdur]

I agree with him but my main issue would be just grab one to use as a starting point. I wouldnt really use it as my replacement unless I knew it was working. I took one from a 98 GM that was at our shop for service and the owner couldnt pay so we owned it and scrapped it. Well I want the compressor so I yanked it before then it was perfect. Problem with the junk yard is you cant stand there and see if it will run. Id still get one but thats your call.

[compose]

Looked at the air height sensor today, it's rusted but still looks intact. Is there a fuse just for the compressor or the whole air suspension system?

[fastblackmerc]

Looked at the air height sensor today, it's rusted but still looks intact. Is there a fuse just for the compressor or the whole air suspension system?

In the fuse box inside the car check fuse #16 (15A)

In the power distribution box under the hood, relay #303 is for the air suspension.

If the #16 fuse is good (check it with a test light), try swapping the #303 relay with the #304 relay (heated backlight).

If that fixes it, replace the #303 relay.

[JOEMERC]

Take it back to the shop where this happened and tell them what it is now doing ,maybe they can help.that is if want they want your business.

[compose]

Thank you MM community all for your help in this. I changed out the air height sensor but it did not help. Was forced to change out the compressor with one from Suncore and that did the trick. The Air bags look good but will change out them out over this summer to be on the safe side.