Working on my 2004 W211 wagon with electrical issues, resulting and related to a blown suspension air pump..(the new pump works great but does not respond to commands from the foxwell or low rear end signals)

Great helpful members have shared that there is a suspension control module which may be blown or de-powered. The foxwell scanner does not show this module on the menu or access it. The scanner can go to just about any component and actuate it, the rear washer sprayer, strut solenoid fill and empty valves..and these work in response to commands entered.

The scanner will tell me in one message that it is possible to test the compressor and then when entering the command it cannot communicate. (could simply be a fried wire in the compressor leads..) Relay and fuse are good.

To really test the air pump leads I suppose Id need to run continuity test from the relay activation pins in the circuit panel down to the motor connection socket..

I simply wired the new air pump (Arnott) to a spare battery and aired up the rear shocks with a jumper being careful not to melt down anything and giving it rest breaks to cool off. And the suspension is restored to full ride height plus a bit..The shocks and reservoir and system do not leak. Holds great..

But the scanner tells me it cannot communicate with the SVCM or special vehicle control module which I find for sale, not expensive, but I cant locate a description of the function of this module. I suspect it may be involved with the nav system which I dont have on this car, or something equally unrelated to the suspension system. All I can learn is that the SVCM is different if its on a taxi or police vehicle or...but not what this critter does! And all I know is I cant communicate with this thing! Whatever it is!!

Thanks anyone/everyone.