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Suspension Air Compressor connector pin out

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  #1  
Old 04-26-2019, 10:12 PM
Pulse_GTO's Avatar
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Default Suspension Air Compressor connector pin out

Hello,

Does anyone a pin out for the rear suspension air compressor? This is for a 2003 H3: Thanks!
 
  #2  
Old 04-28-2019, 03:18 PM
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I meant H2. I'm trying to find a way to manually turn on the compressor to see if it still works.
 
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Old 04-28-2019, 03:37 PM
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Would jumping the relay by the back tire work?
 
  #4  
Old 04-28-2019, 03:51 PM
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trying to post a pinout pic. no luck yet. sorry
 
  #5  
Old 04-28-2019, 03:55 PM
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  #6  
Old 04-28-2019, 04:05 PM
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Quick repair on mine was another airline tee with an air valve for each bag. I top it up with a hand pump. lol. Spring kit on order.
 
  #7  
Old 04-28-2019, 04:28 PM
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My bags are new and it worked great for a few days then the service air suspension message came back. If I could just get them aired up I would disconnect the compressor wiring and get the codes read with a Tech 2.
 
  #8  
Old 04-28-2019, 06:45 PM
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Well jumping the relay did nothing. I need to find a way to feed 12v into the compressor. Any ideas?
 
  #9  
Old 05-01-2019, 06:39 AM
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Sounds like you've either lost power (check fuses) or lost comms (check earthing) or a faulty ECU.

Assume need to drive it to get the codes read, better to get the DTC codes 1st without if you can.

The main ECU/BCU checks for the presence of the AS Unit on a fresh start-up, disconnect the battery for a couple of minutes then reconnect. See if the "Service Air Suspenion" message still appears, if not and the suspension still isn't working, then its either comms or the ECU itself.

Is yours a single compressor or dual compressor unit? The attached should be details for a 2003.

The air-control is a bit more complicated than just turning on the compressor, you also need to activate the air "fill" Inlet Vales (left+Right) to allow each bag to fill, unfortunately these are electrically operated only (least they are on a dual systems)

Avoid putting power on to anything connected to the ECU, you really don't wany to damage that, you may find the compressor and valves can be unplugged individually.

The AS unit gets pretty corroded so I'd be tempted to check the earthing and power to the unit, perhaps pull the unit and give it a "once-over" at least then you can check the compressor.

Keep us updated!

 
Attached Files
File Type: pdf
2003 AirSuspension.pdf (212.5 KB, 79 views)
File Type: pdf
2003 AS Components.pdf (246.7 KB, 82 views)
File Type: pdf
2003 AS Connectors.pdf (482.2 KB, 155 views)
  #10  
Old 05-04-2019, 08:34 AM
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Another important point is that the only scan tools that can detect and do anything with the air suspension are the actual GM dealership tools, the Tech2 or the MDI (using a Tech2 emulation or something). I have one of the Chinese close Tech2's which works great and you can run certain tests, recalibrate the height, inflate, deflate for servicing, etc. I believe Oceanbrave also picked up one. For certain things on GM vehicles they are an immensely helpful tool but also not very cheap (originals will usually be over $1000 but the Chinese clones can be had for a few hundred) and takes a bit to learn and explore how certain things are done with one.
 


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