As far as i know, the harness go to the right rear corner on the passenger side. So i guess the controller is in the truck behind the right plastic cover, where as well the Climabox for the rear AC is.

 

thank you i will check it out. i did see a module on the passenger side frame near the back 1/4 panel but i am not it is the one. i did pull back the plastic cover on the passeger side inside the back did see much. ill need to completely dismantle it the back i guess

 

You are welcome. What is the problem with the air suspension?

 

air will not work even after replacing everyting but this part bu i can not find it on my 2005 Cadillac Escalade ESV i get code C0660

GM Genuine Parts 15095294 Active Suspension Control Module, Suspension Control Modules - Amazon Canada

GM Genuine Parts 15095294 Active Suspension Control Module in Suspension Control Modules.

www.amazon.ca

 

Why and who exchanged everything? Bevor i swapp something, there has to be a diagnose.

The System is quite easy. You have a compressor, a heigh sensor, a control unit, a valve, fuses, relais, harness and dampers.

The compressor should start, when the level sensor detect low suspension. If not, first put 12v to the compressor direct. If it starts and pump, it is a problem with relais, fuse, control unit or level sensor. If not, its the compressor itself.

If you go this way you, or a mechanic, should identify the defect part very fast.

Can you tell more about the problem and who made which diagnosis and swapped what exactly?

 

The code you have says: Exhaust valve circuit shortcut. So it seems that your exhaust valve failed, the harness have a problem, or the control has a problem. In descending order of likeliness.

https://www.autocodes.com/c0660_cadillac.html