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Cadillac Escalade, EXT and ESV Forum - 1999 - 2006 Discussion, Answer the 1Million Question: Where is the air ride control relay located? in Cadillac Escalade Forums; It should help yes. Let us know what you find out!...
  1. #121
    WSLN 6 is offline Cadillac Owners Member
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    It should help yes. Let us know what you find out!

  2. #122
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    You bet! All you need now is a copy of the GM Service manual on DVD. With the Tech2 scanner this will be a piece of cake to figure out whats wrong.

  3. #123
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    More data taken at the steering sensor:
    -ORG (Signal #2) : 2.01V
    -GRY (Signal #1): 4.03V
    -TAN (5V Ref): 4.90V
    -ORG/BLK (Low Ref): 7.6mV
    Data was taken ignition on, wheels straight. Voltage does vary moving the steering wheel.


    After a quick recheck, all 5V reference for the sensors (4 X ride height position sensors (RHPS), pressure and steering wheel are within specs.) Here is the location of the 5V reference voltage needed to be between 4-6 Volts or else DTCC0870:

    LF RHPS: A3 PPL/WHT @ LTBLU Connector SCM module
    RF RHPS: B3 PPL/WHT @ LTBLU Connector SCM module
    LR RHPS: A6 RED/BLK @ LTBLU Connector SCM module
    RR RHPS: B6 RED/BLK @ LTBLU Connector SCM module
    Steering input sensor 5V Ref: A9 GRY @ LTBLU Connector SCM module
    Pressure sensor 5V Ref: A9 GRY @ PNK Connector SCM module

    The investigation continues...

  4. #124
    ESKY02 is offline Cadillac Owners Fanatic
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    I dont have the DVD. I havnt got to plug it in yet, some a**hole keyed the shit out of it. 8500 dollars worth!! whole truck needs to be painted! Thank god my insurance is covering it. Not a happy camper right now!

  5. #125
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    sk7 is offline Cadillac Owners Connoisseur
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    Wow $8K worth!!! Thats baaaaad, I'm so glad my truck is always in the garage...

    I've put all my data, plus a wee bit more info I could gather from the wiring diagrams into an excel document. It will be easier to compare data from other users. My EBCM is due back on wednesday, I want to get this air ride issue resolved afterwards. Got other fish to fry (1955 VW resto).

    I've changed the .xls extention to .pdf so it would upload. Just change back the extension of the file to its original format.
    Attached Files

  6. #126
    ESKY02 is offline Cadillac Owners Fanatic
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    Ya!! they went across my headlights, taillights, only thing they didnt touch was my brand new 20's, roof, and the running boards...everything else got it!!

  7. #127
    EXT04 is offline Cadillac Owners Member
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    Hey Caddy guys! My air comp didn't kick on when I turned the ign on. I did check all the fuses and they are all fine. I did replace 2 relays. So I did rewire red to blue. Then the comp kicked on. Obviously the comp works fine.
    What's next? Should I bring it to the shop and let them scan it with tech 2 scanner? I called Chevy Dealership,they said it costs from 65 bucks to 165 bucks to diagnose for "service ride control". Also I called Cadillac they quoted me from 180 bucks to ??, depending. I don't want to put a lot of $$$ into replacing the air ride stuff like LUXURYLIFE. I just want to find out what the problem is. Thanks

  8. #128
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    EXT04, you probably read in the post that there's only 3 codes related to the service air ride issue. Compressor not turning on (relay), solenoid exhaust control or air pressure sensor issue. I would like you to unplug all 3 connectors for a few minutes, with ignition off, then replug it and see if the trouble code goes away next ignition cycle. Also you have no sevice stability system issues with your EXT? Thanxs for your help.

  9. #129
    EXT04 is offline Cadillac Owners Member
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    Quote Originally Posted by sk7 View Post
    EXT04, you probably read in the post that there's only 3 codes related to the service air ride issue. Compressor not turning on (relay), solenoid exhaust control or air pressure sensor issue. I would like you to unplug all 3 connectors for a few minutes, with ignition off, then replug it and see if the trouble code goes away next ignition cycle. Also you have no sevice stability system issues with your EXT? Thanxs for your help.
    Thank you. What about the air pressure switch? I remember when I had my airbagged car the pressure switch wasn't working and the comp wouldn't run. After I replaced it, the comp ran properly. It was a manual one. Where are the solenoid exhaust control and air pressure sensor located? Let me know I can check it out tomorrow.
    Sometimes "Stability" message shows up but it's very rare.
    Let me know. Thanks Alex

  10. #130
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    Solenoid exhaust control and air pressure sensor are all located within the air compressor assembly. The pressure sensor is easy to test as the signal for it is at the SCM. I'm still unsure how to test the solenoid, there's a measured value for it in ohms once its unplugged. I tried to ground the control for it at the SCM before, during and after the compressor runs, I can't hear it click nor does it change the output. That will be my next check, I'll take off the compressor assembly and have a look at it.

  11. #131
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    Well I finally had enough and couldn't wait on my friend to get me to the chevy dealer, so i bit the bullet and took it into the cadillac dealer. After a brief discussion with the service adviser, he said he would on charge 1/2hr labor ($55), i thought WOW, GREAT! so he scans it in about 15 mins and comes back with the compressor being bad. The exhaust solenoid is no good so the compressor needs to be changed. I bought one from Arnott so hopefully thats the end of this 2 month battle with the EXT! The service manager hands me back the keys and says "I did it free of charge" .... THE DEALER SCANNED IT FOR FREE! I couldn't believe my ears... i'll be sure to write his supervisor a good letter!

    So for all of you who hardwire the compressor to get it to kick on and think its OK, it doesn't mean the compressor is good. The exhaust solenoid may have a leak or be bad. I would really recommend paying the $55 if you have to to get it scanned. I bought new rear shocks, new front shocks, and a new relay. Before the compressor I was in the hole about $1000 and all I really needed were the rear shocks. Im also happy the rear bilsteins aren't throwing any codes. For future reference the service adviser claims all codes are erased after 50 ignition cycles.

    sk7, what a coincidence from your last post ^

  12. #132
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    Thanxs for the update! I've been buzy today with my ECBM, so far its ECBM 2 - ME zip! I get a new code, C0255, which is apparently solenoid related so the unit will need to be sent away again...

    The service manual does point out that the solenoid exhaust is activated each time compressor activity is needed when the pressure is below 10psi in the system. I could not get mine to react manually to any inputs I was giving it. But compressor does pump ok nonetheless. Wonder what's the purpose of this valve? Keep us posted if the new compressor unit does the trick! Hang on to your OEM compressor, maybe the solenoid is an easy fix? I'll have a look into that in the coming days.

    DTC C0660 clears when ignition is on and solenoid is ok, and its out of history after 100 ignition cycles if the condition isnt back.

    That was a nice gesture of the dealer to scan it for free. So far free and cadillac just don't mix in the same sentence unless you can squeeze the magic "extended warranty" word in there. And that warranty aint free either.

  13. #133
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    luxurylife33 is offline Cadillac Owners Connoisseur
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    i know right? i couldn't believe it!

    I honestly have no need for the compressor so if you want it, pay for shipping and its yours. I'm not going to try and rebuild it.

  14. #134
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    So I got the compressor from Arnott today, installed it and all is well. I cant believe I didn't go to the dealer to begin with! O well, at least its fixed and the suspension feels brand new! SK7, I will get you a shipping price later this week.

  15. #135
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    Great, thanxs! I'm sure the Arnott compressor will last longer than the OEM one. If I can't fix mine I'm gonna go with that solution also. If the exhaust solenoid is at fault, which I suspect it is. From my understanding, the SCM does monitor the load on the Dk Blu wire (B5 @ C2 connector) which is the negative trigger for the solenoid. Since it kicks on when compressor is first activated (pressure under 10 PSI), a dead solenoid (no load change upon activation from the SCM) will prevent compressor from starting. But I don't get a service ride control message... Ur truck is pretty much in top shape now?

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