Question about 1989 Cadillac Sedan DeVille

1 Answer

1989 deville load level compressor runs for 3 seconds then stops after turning ignition switch on

Has brand new air shocks. Air compressor ran normal until a few months ago with leaking shocks then Air Compressor stopped coming on. Fuse is good as well as Level Control Relay fuse. Unhooked battery to Reset all car Electronics and Air Compressor started coming on intermittantly when turning Ignition on. When Air Compressor does come on it only runs for about 3 seconds and doesn't come on again until Ignition Switch is turned off and back on.

Posted by on

  • Mike Messer
    Mike Messer Apr 02, 2014

    Thank you for suggesting that the Leveling Switch connection should be checked. It is connected and I also was able to put the Leveling Switch in the Up position to see if that would turn on the Air Compressor and it didn't. Air Compressor still only comes on for about 3 seconds after Ignition Switch is turned on after about a 45 second delay. My understanding is that the Air Compressor is designed to come on for about 3 seconds after Ignition Switch is turned on. Any advise if this sound more like the Air Compressor gone bad or Leveling Switch. The fuse and relay switch have been replaced with new ones.

  • Mike Messer
    Mike Messer Apr 26, 2014

    I went to a local U-Pull-It salvage yard. I found an Air Compressor off of a 1991 DeVille and I had the same result as my original 1989 Deville Air Compressor (turning on for approximately 3 second after turning on ignition switch) so it is not the Air Compressor. The Level/Height Sensor from the 1991 DeVille had a different plug than my 1989 (even though the 1989-1993 DeVille is the same body style). I found a Level/Height Sensor from a 1987 (previous body style) with the same plug as my 1989. I tried it on my 1989 and my original 1989 Air Compressor came on and ran until it timed out (approximately 4 minutes) as it was designed. The 4 minute time out is in case of an air line leak to prevent excessive battery drainage. After several cycle from normal driving and turning on and off the ignition, the Air Compressor now only comes on occasionally and now the car is back to its normal height. FYI the Auto Part stores was around $350. for a new Air Compressor. the U-Pull-It was $40. The Auto Parts Store for a new Level/Height Sensor was around $270. and U-Pull-It was $14. I hope the might help anyone with a similar problem.

×

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 44 Answers

Check and make sure that the level control lever that goes to your shocks was reconnected. Might have been overlooked....Hope this helps.

Posted on Mar 31, 2014

Ad

3 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get to try the service completely Free afterwhich it costs $6 per call and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad
  • 2006 Answers

SOURCE: I no longer hear my

If you change the position of the height sensor on the front of rear, the aircompressor should kick on.

I have a 1996 Lincoln Mark VIII that has a fuse in the trunk labeled RSS (beside the on off switch) and if that blows the entire air ride system stops working. But I can't remember whether the self test was gone through or not.

Unfortunately, since the car is not doing a self test when you start the car or getting an error message it sounds more like the computer for your DeVille.

Posted on Jun 21, 2011

  • 1 Answer

SOURCE: 1992 Cadillac Deville Electronic Level control system problem

elc system doesn't automatically level car

Posted on Jul 08, 2011

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

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

1 Answer

Why do I hear a buzzing from trunk fuse box until my car idles down / 2002 Cadillac DeVille


That is the compressor for the rear air shocks. If you stop hearing this noise then something is wrong. It levels the car when running.

Feb 20, 2015 | 2002 Cadillac Deville

1 Answer

Ttrying to fine out where to put the air for the airshock


Vehicles: Cadillacs with ALC-controlled rear shock absorbers

Each rear shock absorber has an ALC (air) port. One may disconnect the ALC air line and try to add air, but this is unlikely to work, since there is no spring-loaded valve to close the port off immediately (like a tire).

A better method for inflating the rear shocks to see if they hold air is to supply 12V DC (from the battery) directly to the ALC system (air) compressor.

Debugging your Cadillac's ALC system can be a challenge. Here are a few basics.

Here's a depiction of the ALC port on the rear shock - found at the end of the ALC air tube.


12_2_2011_12_54_42_am.jpg

Fig. 1 The ALC connection on the rear shock absorber

Here's a close-up of the Cadillac ALC port on the rear shock


12_2_2011_12_59_49_am.jpg

Fig.2 Cadillac ALC air line fitting

---------------------------------------------------------------------------------------------
Automatic Level Control System - General Description
Vehicles Without Road Sensing Suspension

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 a height sensor, an air compressor assembly, an ALC compressor relay, an intake hose and filter, an air tube, and two 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 (air) exhaust solenoid is a non-replaceable part of the air compressor head.

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.

Vehicles With Road Sensing Suspension
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 CVRSS control module, two CVRSS position sensors, an air compressor assembly, an ALC compressor relay, an intake hose and filter, an air tube, and two 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 two CVRSS position sensors. These two position sensors convert this rear height measurement into an analog voltage (0 to 5 volts DC) which is read by the CVRSS control module. The control module then determines what action (exhaust, compress, or no action) shall take place. To compress, the CVRSS control module switches the low-side of the ELC compressor relay to ground.

The air compressor is enabled (switched to battery only when the ignition is on. The air compressor is activated when a sufficient amount of weight has been added to the vehicle.

The exhaust solenoid is enabled at all times. The exhaust solenoid is activated when weight is removed from the vehicle.

Automatic Level Control System Operation w/o F45

Raising the Vehicle
When a load is added to the vehicle, the vehicle body moves down causing the sensor actuating arm to rotate upward. The upward arm movement activates an internal timing circuit and, after an initial fixed delay of 17 to 27 seconds, the sensor provides a ground to complete the compressor relay circuit. The 12V (+) circuit to the compressor is then complete and the compressor runs, sending pressurized air to the shock absorbers through the air tubes.

As the shock absorbers inflate, the vehicle body moves upward rotating the actuating arm towards its original position. Once the body reaches its original height, +/- 25 mm (+/- 1 in), the sensor opens the compressor relay circuit, and the compressor is turned off.

Air Compressor Head Relief Sequence
In order to reduce current draw during air compressor starting, the height sensor performs an air compressor head relief sequence before air compressor operation. This sequence reduces the air pressure in the air compressor cylinder during start-up. The air compressor head relief sequence occurs as follows:

Exhaust solenoid is energized.
Air compressor is activated 1.3 seconds after the exhaust solenoid is energized.
Exhaust solenoid is de-energized 0.5 seconds after the air compressor is activated.
Lowering the Vehicle
When a load is removed from the rear of the vehicle, the body rises, causing the sensor actuating arm to rotate downward. This again activates the internal timing circuit. After the initial fixed delay, the sensor provides a ground to complete the exhaust solenoid circuit, energizing the solenoid. Now, air starts exhausting out of the shock absorbers, back through the air dryer and exhaust solenoid valve, and into the atmosphere.

As the vehicle body lowers, the actuating arm rotates to its original position. When the vehicle body reaches its original height, +/- 25 mm (+/- 1 in), the sensor opens the exhaust solenoid circuit, which closes the exhaust solenoid and prevents air from escaping.

Air Replenishment Cycle
The sensor actuating arm position is checked when the ignition is turned on. If the sensor indicates that no height adjustment is needed, an internal timer circuit is activated. After about 35 to 55 seconds, the compressor is turned on for 3 to 5 seconds. This ensures that the shock absorbers are filled with the proper residual pressure. If weight is added to or removed from the vehicle during the time delay, the air replenishment cycle is overridden, and the vehicle rises or lowers after the normal delay.

Automatic Level Control System Operation w/ F45

Raising the Vehicle
When a load is added to the vehicle, the vehicle body moves down causing the sensor actuating arm to rotate upward. The upward arm movement activates an internal timing circuit and, after an initial fixed delay, the CVRSS control module provides a ground to complete the compressor relay circuit. The 12V (+) circuit to the compressor is then complete and the compressor runs, sending pressurized air to the shock absorbers through the air tubes.

As the shock absorbers inflate, the vehicle body moves upward rotating the actuating arm towards its original position. Once the body reaches its original height, +/- 25 mm (+/- 1 in), the compressor relay circuit is opened and the compressor is turned off.

Air Compressor Head Relief Sequence
In order to reduce current draw during air compressor starting, the CVRSS control module performs an air compressor head relief sequence before air compressor operation. This sequence reduces the air pressure in the air compressor cylinder during start-up. The air compressor head relief sequence occurs as follows:

Exhaust solenoid is energized.
Air compressor is activated 1.3 seconds after the exhaust solenoid is energized.
Exhaust solenoid is de-energized 0.5 seconds after the air compressor is activated.

Lowering the Vehicle
When a load is removed from the rear of the vehicle, the body rises, causing the sensor actuating arm to rotate downward. This again activates the internal timing circuit. After the initial fixed delay, the CVRSS control module provides a ground to complete the exhaust solenoid circuit, energizing the solenoid. Now, air starts exhausting out of the shock absorbers, back through the air dryer and exhaust solenoid valve, and into the atmosphere.

As the vehicle body lowers, the actuating arm rotates to its original position. When the vehicle body reaches its original height, +/- 25 mm (+/- 1 in), the exhaust solenoid circuit is opened, which closes the exhaust solenoid and prevents air from escaping.

Air Replenishment Cycle
An air replenishment cycle (ARC) is commanded after each ignition-ON cycle. The purpose of the ARC is to ensure that the ALC system is operating at or above minimum air pressure (residual air pressure). The ARC occurs as follows:

The EXHAUST SOLENOID IS ENERGIZED 20 seconds after the ignition has been turned on.
The AIR COMPRESSOR IS ACTIVATED 1.3 seconds after the exhaust solenoid is energized.
The EXHAUST SOLENOID IS DE-ENERGIZED 0.5 seconds after the air compressor is activated.
The AIR COMPRESSOR IS DEACTIVATED 3.2 seconds after the exhaust solenoid is de-energized.

Dec 01, 2011 | 1998 Cadillac DeVille

1 Answer

I have a 1990 Cadillac Deville with the 4.5. I was curious if that car came with air suspension stock. I noticed a little compressor like thing right be hind the battery turn on when I was jacking it up....


The compressor will turn on when the rear air shocks are low. These shocks will begin to leak with age, and if new, can be damaged if you raise the rear end without disconnecting the battery. The shocks will fill with too much air and create a leak. If your motor runs continuously, you may need to replace the shocks. May also have a leak in the air hose going to the compressor. Check the fitting. Short fix would be to disconnect the power going to the compressor, but your ride will suffer.

Jul 18, 2011 | 1990 Cadillac Deville

1 Answer

1989 Lincoln continental ride control not responding. compressor was replace after vehicle sat for several years. all air was out of system. installed new compressor. turn on key car leveled. front of car...


YOU NEED A STAR 2 TESTER 007 - 0041 - A OR DIAGNOSTIC EQUIPMENT THAT IS EQUIVALENT TO TURN ON AIR COMPRESSOR TO TEST AND REGULATE AIR TO AIR SPRINGS. ALSO RESET THE AIR SPRING COMPUTER.IF YOU NEED TO RELEASE AIR FROM AIR SPRINGS TURN OFF AIR SUSPENSION SWITCH.THEN REMOVE AIR SPRING SOLENOID RETAINING CLIP,ROTATE THE SOLENOID COUNTERCLOCKWISE TO FIRST STOP, THEN PULL SOLENOID STRAIGHT OUT SLOWLY TO THE SECOND STOP UNTIL ALL AIR BLEEDS OUT AIR SPRING, THEN REMOVE THE SOLENOID. YOU COULD HAVE DAMAGED FRONT AIR SPRINGS WHEN YOU CHANGED OIL WITH OUT TURNING OFF AIR SUSPENSION.WHICH CAUSED AIR SPRINGS OVER EXPAND DAMAGING THEM.

Apr 04, 2011 | 1989 Lincoln Continental

2 Answers

How to put in air into the air shocks with out the car air compresser working?


You can't without a ton of adapters & fittings. Options: replace compressor or replace air shocks with aftermarket air shocks that you have to manually fill or replace with standard replacement shocks.

Mar 21, 2011 | 1989 Cadillac Sedan DeVille

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.

Jun 04, 2010 | 1988 Cadillac Sedan DeVille

1 Answer

Electronic level control not working right in a 1999 cadillace deville, what can i do to fix it?


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.

May 23, 2010 | 1998 Cadillac DeVille

1 Answer

I have a 99 ford expedition i replaced the air compressor cause the front air shocks were bad and ruined the compressor. and teh rear air bags went flat now that the new compressor is in the rear wont air...


I have a 2001 Expedition, I don't have air bags in the front, the compressor don't work the air shocks. You have rear leveling. When they replaced the (compressor) did they turn the leveling switch back on. you may have air shocks connected to the compressor. Did the rear go down right after or over a couple of days. If the switch is on, turn it off and jack the rear up quiet a bit, make sure both side are quiet equal with each other, like it would be if it where raised by the air bags. Turn your level switch back on with it jacked up or sitting on stands. It may have went down so much that the compressor can't raise them back up.

Jan 04, 2010 | 1999 Ford Expedition

Not finding what you are looking for?
Cars & Trucks Logo

217 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cadillac Experts

yadayada
yadayada

Level 3 Expert

76630 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8514 Answers

Are you a Cadillac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...