Question about 2003 GMC Yukon Denali

1 Answer

2003 denali air ride control problem. Compressor was bench tested and runs when 12 volts is applied. Tested pressure switch on air filter (3 wire) and no continutiy between any of the three terminals. I am assuming this is a switch and is keeping the compressor from running. Can anyone confirm or does anyone have a wiring diagram for the compressor assembly?

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • GMC Master
  • 13,752 Answers

What color wire's ? There is a relay which is controlled by the ESC module (computer ) Electronic suspension control module . The relay supply's B+ power to the compressor . Free wiring diagrams here Enter vehicle info. Year , make , model and engine size. Under system click on suspension then under subsystem suspension controls will pop up on it's own . Click the search button then the blue link's . System can set DTC'S - diagnostic trouble code's . Has hight sensors , control module ,relay etc.....

Posted on Sep 27, 2017


6 Suggested Answers

  • 2 Answers

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

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.
The service is completely free 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.
Good luck!

Posted on Jan 02, 2017

  • 1 Answer

SOURCE: where is the fuse for the air ride compressor on a

the fuse in under the hood in the main fuse box, if your standing over the front drivers side tire, it will be on the far left 4th fuse down, marked RTD/ real time damping..... i believe the fuse is marked 30....

Posted on Dec 31, 2009

  • 77939 Answers

SOURCE: 2003 GMC Yukon XL Denali Service Ride control info

leaking suspension air bags is the most common cause, but the system can be tested for trouble codes, I suggest u do so, only the dealer can do this, but guessing about what the problem is can get very expensive very fast.

Posted on May 13, 2009

  • 159 Answers

SOURCE: I have a 1999 GMC 3/4 ton truck. My air conditioning doesn't work

if it is low on freon the compressor will have 0 volts becuase the low pressure switch on the evaporator isn't triggering...if you have freon then replace the low pressure switch...take a small piece of wire and disconnect the low pressure switch and jump the two sides of the plug together...compressor should come on

Posted on Jun 04, 2009

  • 4 Answers

SOURCE: Why does it sound like an air compressor is always running?

air shocks, they get cold and go down on air or you have a slight leak in the lines. it is normal for the compressor to come on when you start the car. RT

Posted on Feb 22, 2010

Testimonial: "Thanks. I just wanted piece of mind."

  • 14036 Answers

SOURCE: have no power to the ac compressor. all fuses and


Posted on May 27, 2010

Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

2004 Yukon Denali purchased 30 days ago. I've never heard the compressor kick on nor has it leveled when I put a boat trailer on it. The strange thing is there is no warning on the dash and rides well

if dealer could not find out problem would seek second opinion -any codes was compressor tested and is operating --was level switches tested and not rusted and see if system was disconnected and bypassed-that the shocks are the air ride/level option not the standard shock dealer should have been able to tell you this --system is not hard to diagnose for them on a lift and or hooked up -

Sep 29, 2016 | Cars & Trucks

1 Answer

2007 Yukon Denali XL autoride suspension light comes on intermittently

Would need to know what DTC'S - diagnostic trouble codes are stored in the module for the autoride suspension . Hooking up a professional type scan tool ,looking at input data to the module etc... Looking at a wiring diagram an testing electrical circuit's using a DMM - digital multi-meter . Reading how the system works ,what all involved in making the system work . This is how a professional Tech would go about diagnosing this .

The automatic level control (ALC) system maintains a desired rear suspension position under all types of towing, hauling and loading conditions. The following components are involved in the operation of the ALC system:
• Air line tubing--Pressurized air from the ALC compressor is pumped to each of the rear shocks via air line tubing.
• Air drier--Pressurized air from the compressor is run through a drier containing a moisture absorbing chemical preventing water accumulation in the rear shocks.
• Compressor--Supplies pressurized air to the rear shocks
• Compressor motor relay--The relay supplies battery positive voltage to the ALC compressor motor.
• Pressure sensor--The electronic suspension control module (ESCM) module provides a 5-volt reference and low reference to the ALC pressure sensor. The module receives the signal voltage that is relative to the air pressure applied to the rear shocks.
• ESCM--Controls the ALC system and electronic suspension control (ESC) system and detects failures in both. The module monitors inputs from the position sensors, and pressure sensor to determine when to raise and lower the vehicle to trim height as the vehicle is loaded or unloaded. The module limits pump activation to 255 seconds to prevent thermal damage.
• Exhaust valve--An electric solenoid activated by the ESCM to vent air pressure from the rear shocks.
• Left and right rear suspension position sensors--The module provides a 5-volt reference and low reference to all 4 of the body-to-wheel suspension position sensors. The sensors send the ESCM a signal voltage that is relative to the rear suspension ride height
• Left and right rear shock absorbers with internal air chambers and dampers--Dampens the rear suspension and maintains trim height depending on the air pressure applied.

Nov 04, 2017 | 2007 GMC Yukon XL Denali

1 Answer

2000 Cadillac DTS suspension air compressor not running, but tests good.

This is a chat room we use as you do from home

Have no wiring diagrams

Helm.Com for GM Factory Manuals

I have bought them for all my veh since 1965 from helm

No reference material your done as you know

Nov 29, 2012 | 2000 Cadillac DeVille

1 Answer

Cruise control

The switch is on the brake pedal lever follow the pedal up the shaft under the dash and you will find it . This is the usual culprit.
Vaccum lines can be tested
If this is a Discovery it has a separate vacuum pump that can be removed and bench tested by applying 12 volts the the connector

Nov 24, 2011 | Land Rover Discovery Cars & Trucks

2 Answers

I have driven 80K miles so far in 12 years. All of a sudden AC stopped producing cold air. All vents when turned ON only blow heat (HOT-AIR only). AUTO switch only lights up when temperature is increased...

The temp is controlled by a flap called an air door. It could be an electric motor/actuator, a vacuum control or a manual cable but the door is likely not closing all the way and allowing air to pass through the heater core. ----------
There are few possibilities needs to be checked.------ The Freon, is the Freon low.Get the AC pressure tested.The low pressure switch towards the Accumulator, should show 35 to 45 lbs and high pressure switch should show Approx 80 to 100 lbs,------- But if freon level is fine then get the Hvac module inspected.Its module problem , This is the module in the dash board that has all of the A/C control knobs and buttons in it. It is very easy to remove; only 4 screws have to come out first.This module fails or shorts and cause this problem.------ But first check the freon level, if its low then its low freon problem.Get the pressure tested, if no pressure showing then by pass low pressure switch via jumper and see if compressor runs.If yes then replace the low pressure switch.But if all checked ok, then its HVAC module.--------- This will help.Thanks.Helpmech.

Sep 16, 2011 | 1999 Buick Century

3 Answers

2003 lincoln navigator. The air ride compressor will not come on. Checked all fusses and relays and they r good. The compressor will run when u straight wire it. Why won't it come on automatically?

I know you stated you checked all fuses and relay and they're ok but The 2003 Lincoln Navigator had two differently (wired) air ride systems. A early production and a late one, and I think I may have a good Idea of what your problem may be and will walk you through how to properly test the system. The early production navigators used a solid state compressor relay and the later production units used a standard style relay. The early ones with the solid state type has been known to have some problems and working for a Ford, Lincoln Dealer for 21 years I have replaced a good number of these solid state relay for a air ride compressor inoperative concern. There seems to be some confusion on the location of the solid state relay. I would advise you to look behind your front bumper on the passengers side of your vehicle (and below your headlight) and see if you have a 4 wire relay that's aluminum and finnd ribs on the front of it and I believe a black base where the wiring connector plugs in. (this will be mounted to the radiator support) if so, you Have got the early production style. I will walk you through how to test this relay and also help you to isolate the cause of your problem. I highly recommend using a volt ohm meter for these tests. I do not recommend using A TEST LIGHT due to the fact that you will be testing a circuit that is wired to the air ride control module, and there is a possibility of you damaging the module with a test light !!! I have been there, done that, NOT GOOD.
Ok with that said: your wire colors should be as follows:
one that's( gray and red)
another that's (light green and red)
another that's (dark blue and yellow)
and one that (light blue and pink).
Disconnect the connector at the relay and you'll be testing the wires in the connector (THAT HOOK UP TO THE RELAY). The air ride compressor and the air ride solid state relay share the same ground which is the light green and red wire.
Turn your volt ohm meter to dc volts scale and attach the black wire (NEGATIVE) lead of the volt ohm meter to the light green and red wire.
Hook the red lead of the volt ohm meter to the light blue and pink wire.
Here your volt meter should read battery voltage (of your car's battery) if not check the (F2-111) 50 amp designated fuse in the fuse box under the the dash on the passengers side (KICK PANEL).
If this fuse is ok, make sure you were making good contact with your test leads into the compressor relay connector.
If you're comfortable with the fact that you have a good connection at the relay connector and your fuse tested ok, then you have a ground problem at ground point G101 which is located right near the mounting location of the air ride relay.
If you had battery voltage when you tested between the (light green and red) and the light blue and pink wires, you have confirmed the power source and ground to the relay.
I should clarify myself at this point. The wires at the relay are as such: The ground is the light green and red wire, the light blue and pink is the fused power source to the relay, the dark blue and yellow wire is the relay trigger source from the air ride module to the air ride relay, and the grey and red is the relay output (battery +) to turn on the compressor. OK.
So now we're down to checking the trigger source to the relay and the relay output. At this point I want you to re-hook up the volt ohm meter with the meter still set at volts d/c scale and reconnect the (red lead) of the volt ohm meter to the (light blue and pink wire) and connect the (black) lead of the volt ohm meter to the dark blue and yellow wire (again at the relay connector).
Now this next step is best done with the help of an assistant!!
While watching your volt ohm meter, have your assistant turn on the key and open and close the drivers door two -to- three times. After cycling the door, you for a short time should see at least 5 volts minimum, if not battery voltage at your meter.
(this is a little bit unclear to me due to the fact the air ride module shows that the dark blue and yellow wire, as a ground from the air ride module to the relay. but does not clarify exactly what value that ground signal should be). I am referencing Fords own wiring diagram.
A solid state relay usally is allowed a trigger source of a lower voltage then a standard relay. If you find you have no voltage reading at your volt ohm on this test, you'll first want to check fuses F2-20 which is a 30 amp fuse and F2-27 which is a 5 amp fuse in the same fuse box as the F2-111 fuse you checked earlier.
The last test you need to make at the relay is checking the relay output to the compressor. This will be done by again using the volt ohm meter. This time you'll want to hook the black lead of the volt ohm meter to the light green and red wire at the reay connector and hook the red lead of the volt ohm meter to the grey and red wire at the relay connector. Again for this test, you'll need to have a assistant turn on the key, then recycle the drivers door again.
If the relay is working properly you should have battery voltage, aproximately 12 volts showing on your meter. If not and all other test procedures results were correct, you have a bad relay.
If you have 12 volts on this test we have confirmed the relay is good and the trigger signal from the air ride module is operating as designed.
If the pump runs like you said (when it is straight wired ) the remaining possiblity is a broke wire between the air ride relay to the air ride pump (this being the grey and red wire) which you can test by switching the volt ohm meter to the ohms scale and touching one lead of the meter to the grey and red wire at the relay connector and the other to the grey and red wire at the compressor (with the compressor and the relay both disconnected). Your reading here should be 0.5 ohms or less. If you have under 1.0 ohms you're ok but specs are 0. 5 or less.
If you have an auto ranging type ohm meter, be sure your reading in ohms and not kilo ohms or mega ohms.
If you find while performing the test from the air ride module to the air ride relay (dark blue and yellow wire) referenced as the trigger signal, incorrect and all fuses all checked o.k. then it is possible the air ride control module is defective. But, before condemning the module, there are a multitude of input signal;s to the module that would have to be checked.
WARNING: Make sure your tests are accurate. Good to check and re-check each test. Be confident of your results.
Inaccurate tests and inaccurate test results= unnecessary parts replacement. Results are large dollars spent when unneeded.
Hope this helps you out.thanks for using fixya

Jan 03, 2011 | 2003 Lincoln Navigator

1 Answer

The service ride control light is coming on. What does this mean and how can it be repaired?

this light can mean many things, there are a dozen or so parts in the system, the system can be tested and a trouble code retrieved to lead u in the right direction for a successful repair, the tester is a dealer only special tool, the most common faults are the suspension air bags are leaking (common after about 75-100,000 miles) and the compressor has failed.

Jun 12, 2009 | 2003 GMC Yukon Denali

1 Answer

I have a 1999 GMC 3/4 ton truck. My air conditioning doesn't work

if it is low on freon the compressor will have 0 volts becuase the low pressure switch on the evaporator isn't triggering...if you have freon then replace the low pressure switch...take a small piece of wire and disconnect the low pressure switch and jump the two sides of the plug together...compressor should come on

Jun 04, 2009 | 1999 GMC Sierra

1 Answer

2003 GMC Yukon XL Denali Service Ride control info

leaking suspension air bags is the most common cause, but the system can be tested for trouble codes, I suggest u do so, only the dealer can do this, but guessing about what the problem is can get very expensive very fast.

May 13, 2009 | 2003 GMC Yukon

Not finding what you are looking for?
2003 GMC Yukon Denali Logo

Related Topics:

778 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts


Level 3 Expert

77939 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

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

Answer questions

Manuals & User Guides