99 Deville Leveling System.....
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 99 Deville Leveling System..... in Past Cadillac Vehicle Discussion; Hi Ya'll, Just picked up a 99 Deville, 70k miles. I'm having an issue with the rear leveling system. It's ...
  1. #1
    lisnjay is offline Cadillac Owners Member
    Automobile(s): 99 DeVille
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    99 Deville Leveling System.....

    Hi Ya'll,

    Just picked up a 99 Deville, 70k miles. I'm having an issue with the rear leveling system. It's not too low like all the other posts I've seen. It's WAY TOO HIGH! The car looks like a cat in heat with it's rear end in the air.

    I've checked the fuses, codes and even tried to adjust the sensor. Anything I'm missing besides a new pump?

    Can someone give me a measurement for the rear end to go off of?

    Thanks everyone!

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  3. #2
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
    Automobile(s): 89 Coupe DeVille, 95 Sedan DeVille, 03 SLS, two 02 DHS's
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    Re: 99 Deville Leveling System.....

    Quote Originally Posted by lisnjay View Post
    Hi Ya'll,

    Just picked up a 99 Deville, 70k miles. I'm having an issue with the rear leveling system. It's not too low like all the other posts I've seen. It's WAY TOO HIGH! The car looks like a cat in heat with it's rear end in the air.

    I've checked the fuses, codes and even tried to adjust the sensor. Anything I'm missing besides a new pump?

    Can someone give me a measurement for the rear end to go off of?

    Thanks everyone!
    --------------------
    the Electronic Level Control system is pretty simple -

    it consists of rear shocks that use built in air bladders
    that are inflated or deflated to maintain the proper ride height
    regardless of weight in the back seat and trunk -

    the level control switch senses the ride height -
    and either signals the compressor to engage to inflate the air bladders -
    or signals the exhaust valve to open - and deflate the air bladders -
    or do neither if the ride height is correct -

    the compressor assembly houses the compressor and exhaust valve -
    to either inflate or deflate the air bladders in the shocks -

    ------------

    if the level switch isn't signaling the exhaust valve to open -
    the rear will sit high -
    likewise - if the exhaust valve doesn't open -
    the rear will sit high -

  4. #3
    rodnok01's Avatar
    rodnok01 is offline Cadillac Owners Connoisseur
    Automobile(s): 98 DeVille, 97 DeVille d'Elegance
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    Both my 97 &98 are @ 26" measured top center of wheel opening to the ground. I set mine up from FSM measurements, so they're close anyways. Without measuring: top of tire maybe 1/2" hidden(with driver in car). If you can see all of the tire it's high.

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 99 Deville Leveling System.....

    Have you pulled the DTC's? I'd almost bet you'll find C0660 - Level Control Exhaust Valve Circuit Malfunction.

  6. #5
    lisnjay is offline Cadillac Owners Member
    Automobile(s): 99 DeVille
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    I have pulled the codes from the dash, but not with a code reader. No suspension codes. No codes as a matter of fact.

    Is there a way to test the switch on the driver's rear tire or do you just replace it?

  7. #6
    rodnok01's Avatar
    rodnok01 is offline Cadillac Owners Connoisseur
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    Re: 99 Deville Leveling System.....

    You can adjust it, so yes it can be tested there also.

  8. #7
    lisnjay is offline Cadillac Owners Member
    Automobile(s): 99 DeVille
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    I've already adjusted it "down" so I'm assuming that it's the pump. Thanks for your help!

    ----------

    Well just pulled to see if there were any codes that popped up. No codes, so I guess I will try replacing the switch before the pump.

    Thanks again all!

  9. #8
    lisnjay is offline Cadillac Owners Member
    Automobile(s): 99 DeVille
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    Re: 99 Deville Leveling System.....

    Well I'm not going to replace the pump till after I get back from vacation next week. In the mean time, is there any way to temporally "deflate" the system a bit?

  10. #9
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 99 Deville Leveling System.....

    Manually operate the switch or unplug the air line from one of the shocks.

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