Anyone have a schematic or wiring diagram for the ELC? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-11-2006, 09:59 PM   #1
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Default Anyone have a schematic or wiring diagram for the ELC?

A friend of mine has promised to take a look at my ELC this weekend. As I don't even have a shop manual for this thing yet, does anyone have anything I could use to help troubleshoot it?
Thanks
Erik
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Old 07-11-2006, 10:22 PM   #2
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Thanks for moving it. Newbie mistake putting it in the wrong forum.
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Old 07-23-2006, 12:12 AM   #3
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Bumping this up to the top.
Doesn't need to be for the 98. I am sure a Bonneville will be close enough to help me troubleshoot.
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Old 07-23-2006, 09:48 AM   #4
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what is your problem, that will help us help you better
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Old 07-24-2006, 02:45 AM   #5
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The problem?
Well, right now my ELC is not working. Gonna replace the struts in 2 weeks, but then I also want to take a comprehensive look at the ELC system. I do know the compressor works, but power is not getting to it. COuld be just something as easy as a blown fuse, but if I start getting into it seriously, it would be nice to have a scematic on hand.
Thanks!
E
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Old 07-26-2006, 03:18 PM   #6
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If you PM me with your email, I could get a schematic out to you for the 94 bonne. Do you have a tire inflator? (I think only the Pontiacs do) Let me know, though, the schematic is slightly different, adding the inflator switch and relay.

Basically there is not a whole lot to it...

Every effort was made to ensure accuracy but I assume no liability for mistakes or typos.

There is a "height sensor module" (HSM) under the car, with an arm that moves up and down as the car suspension sags or rises.

That HSM has 3 switches inside it, which are probably solid state.

1. activates 17-27 seconds after a change in height. this is activated by solid state electronics in the HSM. The electronics gets its hot power at pin C of the HSM. Pin A is the ground.
2. activates when the car is low... this completes a circuit to a relay in the relay centre (position E). The relay, in turn, completes the circuit to run the compressor. This switch grounds pin B of the HSM.
3. activates when the car is high... this completes a circuit to the exhaust solenoid which is located in the compressor head. This switch grounds pin E. I believe the exhaust solenoid opens a valve in the compressor head, which leaks air and allows the struts to settle.

Closing switch 2 or 3 by themselves will not complete their circuits if 1 is not also closed.

There is also hot power coming to pin D of the HSM. It is not clear why the HSM needs two sources of hot. It does have an internal timer to keep the compressor from running continuously should you have an air leak, so it may have something to do with that.

So, barring the normal problems of blown fuse, broken wire, pulled plug etc....the compressor will not run if....
1. the HSM switches 1 or 2 don't close ....
2. the HSM reset system is screwed, and isn't allowing the switches to close.
3. the relay in the relay centre is shot.

For the compressor assembly itself, there are just 4 active pins.
1. when HOT is applied at pin B and ground at pin D, the compressor runs. Pin D of the compressor assembly will be grounded by the relay in the relay centre, when IT, in turn, is grounded at pin B of the HSM.

2. when HOT is applied at pin A and Ground at pin C, the exhaust solenoid activates. Pin C of compressor assembly is grounded when pin E of the HSM is grounded through the HSM.
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Old 07-26-2006, 10:19 PM   #7
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Awesome!
Thanks so much for the help. Tis truly appreciated!
Erik
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