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.