05 ESV Air Ride Compressor Not Running Even After Replacing
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Cadillac Escalade, EXT and ESV Forum - 1999 - 2006 Discussion, 05 ESV Air Ride Compressor Not Running Even After Replacing in Cadillac Escalade Forums; 2005 ESV Platinum Air ride compressor was not running. To diagnose I looked at fuses and jumped relay pins and ...
  1. #1
    BlueOvalKid is offline Cadillac Owners Member
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    05 ESV Air Ride Compressor Not Running Even After Replacing

    2005 ESV Platinum

    Air ride compressor was not running. To diagnose I looked at fuses and jumped relay pins and still wouldn't turn on.

    Based on above I bought a replacement compressor from Arnott and replaced it along with rebuilding the dryer.

    Put everything back in and the compressor is still not turning on.

    What do I check at this point?

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    the cadillac man's Avatar
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    Quote Originally Posted by BlueOvalKid
    2005 ESV Platinum

    Air ride compressor was not running. To diagnose I looked at fuses and jumped relay pins and still wouldn't turn on.

    Based on above I bought a replacement compressor from Arnott and replaced it along with rebuilding the dryer.

    Put everything back in and the compressor is still not turning on.

    What do I check at this point?
    There should be a couple fuses in the under hood fuse box check those and also check the stud 1 fuse

  4. #3
    BlueOvalKid is offline Cadillac Owners Member
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    Re: 05 ESV Air Ride Compressor Not Running Even After Replacing

    I need to know what is feeding pins 85 & 85 on the relay circuit.

    I have a good 12v on pin 30. If I jumper pins 30 & 87 the compressor will turn on manually now. So, I know my replacement Arnott is ok.

    What is feeding the 85 & 86 lines on the relay to open that circuit to kick on the compressor?

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    the cadillac man's Avatar
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    Quote Originally Posted by BlueOvalKid
    I need to know what is feeding pins 85 & 85 on the relay circuit.

    I have a good 12v on pin 30. If I jumper pins 30 & 87 the compressor will turn on manually now. So, I know my replacement Arnott is ok.

    What is feeding the 85 & 86 lines on the relay to open that circuit to kick on the compressor?
    Check the rtd fuse in the underhood fuse

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    BlueOvalKid is offline Cadillac Owners Member
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    Re: 05 ESV Air Ride Compressor Not Running Even After Replacing

    I have checked & double checked every fuse under hood and the IGN3 on the interior fuse panel.

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    the cadillac man's Avatar
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    Quote Originally Posted by BlueOvalKid
    I have checked & double checked every fuse under hood and the IGN3 on the interior fuse panel.
    I would check the connections

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    BlueOvalKid is offline Cadillac Owners Member
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    Re: 05 ESV Air Ride Compressor Not Running Even After Replacing

    Quote Originally Posted by the cadillac man View Post
    I would check the connections
    Can you elaborate or can anyone else provide some guidance?

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    Quote Originally Posted by BlueOvalKid

    Can you elaborate or can anyone else provide some guidance?
    I was talking about the harness at the compressor check it

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    BlueOvalKid is offline Cadillac Owners Member
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    Re: 05 ESV Air Ride Compressor Not Running Even After Replacing

    Pin 30 has 12v with key OFF

    Pin 85 has 12v with key ON

    Jump either to pin 87 and the compressor turns on (obviously dependent on key position).

    What feeds pin 86 to complete the relay circuit? I'm thinking it has to come from either the compressor or computer to signal the relay to close the bridge to pin 87.

    Does anyone have a wiring schematic for this relay and what circuits control it?

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    Quote Originally Posted by BlueOvalKid
    Pin 30 has 12v with key OFF

    Pin 85 has 12v with key ON

    Jump either to pin 87 and the compressor turns on (obviously dependent on key position).

    What feeds pin 86 to complete the relay circuit? I'm thinking it has to come from either the compressor or computer to signal the relay to close the bridge to pin 87.

    Does anyone have a wiring schematic for this relay and what circuits control it?
    Send me a pm with your email(if my inbox is full let me
    Know as the iPhone app doesn't let me
    Know how full it is)

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    BlueOvalKid is offline Cadillac Owners Member
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    Re: 05 ESV Air Ride Compressor Not Running Even After Replacing

    Quote Originally Posted by the cadillac man View Post
    Send me a pm with your email(if my inbox is full let me
    Know as the iPhone app doesn't let me
    Know how full it is)
    Sent

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    Quote Originally Posted by BlueOvalKid

    Sent
    Got it

  14. #13
    BlueOvalKid is offline Cadillac Owners Member
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    Re: 05 ESV Air Ride Compressor Not Running Even After Replacing

    If I'm looking at the schematic correctly then pin 86 of the relay is controlled by the ESC computer, correct?

    I have checked all other pins of the relay and they are working properly.

    Since I don't have any DIC messages would this point to the ESC computer being bad then and I need to replace?

  15. #14
    the cadillac man's Avatar
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    Quote Originally Posted by BlueOvalKid
    If I'm looking at the schematic correctly then pin 86 of the relay is controlled by the ESC computer, correct?

    I have checked all other pins of the relay and they are working properly.

    Since I don't have any DIC messages would this point to the ESC computer being bad then and I need to replace?
    I would see if the fuse isn't blown for the module
    You are correct on the pin

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    Re: 05 ESV Air Ride Compressor Not Running Even After Replacing

    try starting it and putting in in drive... I saw that worked on the million dollar post

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