Question about 2005 Pontiac Montana

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When should you have to replace

The level rider sensor link and compressor?

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  • smitht129 Mar 09, 2009

    Thank you. I just thought that it was weird that I have to replace my level ride sensor link and compressor so soon. My van is a 2005 Montana.

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  • Pontiac Master
  • 6,982 Answers

Both components are not "service interval" items and are not changed on a schedule. You need to replace them if they fail. Most often link fails...compressors are fairly durable and should last a long time unless physically damaged (not saying they never fail, just not that often)

Posted on Mar 07, 2009

  • Richard Scordino Mar 09, 2009

    THANKS FOR THE GREAT RATING...JUST THOUGHT I'D NOTE THAT I HAVE A PUMP FROM A gm VEHICLE THAT WAS SCRAPPED ABOUT TEN YRS OR SO AGO,,,I USE IT AS A TIRE FILL PUMP & IT JUST KEEPS ON WORKING (WAY PAST ITS EXPECTED SERVICE LIFE, AND I USE IT A LOT!

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Posted on Jan 02, 2017

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06 cad STS. Loud pitch noise coming from trunk area. Not the parking assist. Does it while driving. Only ways to make it stop is to cut off car. Sometimes comes right back on when start car back up


Air compressor for load leveling system ?

Automatic Level Control (ALC) Compressor
(2) Automatic Level Control (ALC) Exhaust Solenoid

The Automatic Level Control (ALC) system automatically adjusts the rear height of the vehicle in response to changes in vehicle loading.
The ALC system consists of the Electronic Suspension Control module, 2 position sensors, an air compressor assembly, an ALC compressor relay, an intake hose and filter, an air tube, and 2 rear shock absorbers. The air compressor assembly consists of an air compressor and an air dryer mounted on a bracket. The air compressor head is a replaceable part of the air compressor. The exhaust solenoid is a non-replaceable part of the air compressor head.
The vehicles rear vertical height is measured by the 2 position sensors. These 2 position sensors convert this rear height measurement into an analog voltage which is read by the ESC module. The ESC module then determines what action exhaust, compress, or no action shall take place. To compress, the ESC module switches the ELC compressor relay to ground.
The compressor is activated when the ignition is on, and weight is added to the vehicle. The exhaust solenoid is connected directly to the battery (+), enabling the system to exhaust with the ignition on or off when excess weight is removed.

Feb 07, 2017 | 2006 Cadillac STS

2 Answers

What if my rear drops on my load leveling suspension on 2004 gmce nvoy


That means the air has left the shocks. The compressor may have a bad fuse or have stopped working all together. The level sensor may not be operating either.
.

Jun 07, 2014 | 2004 GMC Envoy

1 Answer

My ELC compressor do not come on buick


When you turn the key on, after a couple of seconds the system should cycle the compressor on for a couple seconds at least. If not, you'll need to troubleshoot if it is an electrical problem (fuse, relay, height switch/sensor, wiring in between components/bad connections) or a mechanical problem (compressor, hoses, bladder on air shocks leaking air).

There is a fuse & a relay for the Electronic Level Control/ELC also called Automatic Level Control/ALC under the back seat in the power distribution block/fuse. Switch out a relay with a similar one and check the fuse for a burnt center section.

There is a ride height sensor attached to one of the rear control arms. With the vehicle safely raised and supported, disconnect the 'link' from the sensor to the suspension arm. With the key ON and engine NOT running, push the arm on the ride height to the compressed/riding low setting. After about 15-30 seconds (it is slow to respond or it would kick on and off over every bump) the compressor should turn on and begin filling the air bladders on the rear shocks.

If the compressor still fails to come on, you'll need to unhook the harness connector at the compressor. Again, with the key ON, engine OFF, height sensor compressed connect a voltmeter to the Dark Green wire on the chassis side of the harness connector (there are four wires to the compressor. 2 wires are for the electric motor to raise the car, and 2 wires are for the Vent solenoid the releases air pressure lowers the car) and ground to see if the compressor is being told to turn on by the height sensor. If it is being commanded on and supplied electricity, and still doesn't make noise or pressure, then replace it off a similar year GM vehicle that has rear air suspension (Cadillacs, Buicks, Oldsmobile Auroras). As long as the compressors are the same, you can just remount it in your car's mounting bracket assembly and save some $$.

If the compressor comes on but the car won't rise, check the air lines to each shock from the compressor, the bladders on the shocks themselves, the filter on the compressor intake or even the vent solenoid assembly on the compressor unit has been known to leak/corrode/stick.

Good luck.

Apr 14, 2014 | 2000 Buick LeSabre

1 Answer

Can't find the relay for the electronic level control(elc) for a 1999 cadillac eldorado


1. Locate the automatic level control height sensor under the rear of the vehicle on the rear suspension support. If the back of the car is too low and will not pump up, ground pin B Yellow wire and see if the compressor will come on and the car will raise.

2. If the car does raise when pin B is grounded, check the powers and grounds to the height sensor.
3. If the powers and grounds are OK and the pump does come on and the car raises when pin B is grounded, the height sensor will need to be replaced.

4. If the car is too high and will not come down, ground pin E White wire at the height sensor to see if the car will lower.

5. If the car lowers when the White wire in pin E is grounded, check the powers and grounds to the height sensor.

6. If powers and grounds are OK and the car does lower when pin E is grounded, the height sensor will need to be replaced. Tech Tips: There are two different automatic level control systems for this car; one is without RPO F45 and one is with RPO F45. The system without F45 has an automatic level control height sensor and with F45 the automatic level control compressor is controlled by the continuously variable road sensing suspension module. Tests/Procedures: 1. Using a head lamp as a load, test the ELC height sensor power/grounds.

2. The power feeds are: Orange wire, pin C and a Brown wire, pin D.

3. The ground is pin A, Black wire.

4. Ground the White wire at the height sensor, check that the vent solenoid in the ELC compressor clicks and vents the air from the system. Author: Bill Siegmann

Dec 24, 2012 | 1999 Cadillac Eldorado

1 Answer

FRONT RIGHT SIDE IS NOT LIFTING BUT I DO HEAR THE COMPRESSOR ON. AND MY SYSTEM SAYS AIR SUSPENSION SENOR FAULT


there is a link the connects the height sensor to the control arm the links pop off the sensor and the system doesn't know its not level

Sep 13, 2012 | 2004 Lincoln Navigator

1 Answer

Where is the fuse for air compressor for shocks on 1995 deville?


It might have a fusible link, usually located in the wiring harness under the hood. If the compressor is not coming on, then check the level sensor for proper operation.

May 23, 2011 | 1995 Cadillac DeVille

1 Answer

I have 99 Ford expedition and the check suspension lights come on and off and sometimes the compressor does not work and when the engine is switched off, sometimes the chassis remain at high level and does...


i would replace the compressor relay module, and also take a look at the level sensors.Make sure the sensors are operating correctly and are connected to control arm.

Jul 20, 2010 | 1999 Ford Expedition

2 Answers

Lift sensor for rear of 1988 Deville


To begin with, check the "ride level" fuse and make sure that the ride level compressor does work, and you should be able to hear that the ride level compressor is working when the ride level system is leveling the vehicle.

The ride level system uses an air compressor and either an air type of shocks or a type of air billow to raise and lower the vehicle, there is an adjustment to set the ride height and it is located under the vehicle and there is a control lever or rod that should be connected between the rear axle and a switch that is mounted on the body of the vehicle, and there will be an adjustment slot in the control lever between the switch and the body, and that is how you would adjust the ride level height, but be sure that the vehicle can not drop any further down if someone is under the vehicle trying to adjust the ride height.

However, you might find that the control lever to the ride level has fallen off from the switch on the body or it has come loose from the rear axle, and it is just hanging there not operating the switch on the body that controls the the ride level compressor, or there might be a blown out air shock or billow, or you might find that an air line from the compressor is leaking and the ride level compressor will just run continuously until it blows out the fuse, and if that is the case you might also find out that the air compressor has burned out from running continuously.

I hope that this information will help you to solve your ride level problem.

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1 Answer

1996 lincon town pump works and cuts off before airing up


I am new at the Air Suspension issue myself. My 96 is beginning to have some issues. But, have you had the Height Leveling sensor above the rear axle checked out? The position of this sensors 'arm' is what tells the system to turn on and off the Air Compressor in order to maintain a level ride height. From what I have read. these sensors wear out. A faulty sensor could be telling the compressor to kick off to soon.

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1 Answer

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chances are that your leveling sensor is the problem this is located on the shocks themselves.

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