2004 Cadillac Deville dtc-co660 automatic level control sy

at a loss with the alc system. have a dtc co660 code tells me to repair the coil side feed circuit of the exhaust solenoid. did a continuity check on the coil side feed wire and its fine. replaced the (rim)-rear integration module ,replaced the level control switch, Can't figure this one out. the only way i can get the compressor to run for the shocks is to stick a jumper wire in the relay sockets in the fuse box. if this is a wiring issue i could use a wiring diagram of that system. the only other thing that i can think of is, since the compressor works it must be the exhaust solenoid itself. but this requires buying a complete compressor system and thats not cheap. any ideas would help, thank you.