Good evening guys.

I have a 2003 E55 AMG and I have run into trouble with my Airmatic. While driving, I got the visit workshop light in the cluster, and the dampers entered safety mode (firmest setting).

Running the code with XENTRY DAS "5194 - Power Supply Valves - Short Circuit to Ground". The car does not raise or lower itself at all. Here is everything I've done to try to troubleshoot the issue:

- Unplugged airmatic computer and checked continuity for all 18 valves from the computer side per the DAS diagnosis steps
- Bench tested both the airmatic valve block and the pressure relief valve on the compressor, both activated when met with a 5V power supply, but I did try replacing them anyway just to eliminate any factors (did not fix the issue)
- Induced interturn shorts by disconnecting the valves and completing the circuit with test leads at all wiring to the valves to see if the code for those would show up with the 5194 at the same time as the interturn codes (no results)
- Opened up the airmatic computer to check for blown diodes or burnt circuits, checked out fine but tried to replace it anyway again to eliminate it as a factor (also did not fix the issue)
- Replaced the airmatic relay, I knew this wouldn't do anything as its for the compressor not the valves but it was worth a try

My next test that I'm going to do is backprobe the wiring harness to the airmatic computer and test the voltage when the ignition is turned on. However, after this I have zero idea what to do and I'm quickly running out of patience before I switch to coilovers.

Some info I've gathered is that when the ignition is turned on and/or you check fault codes with XENTRY, the airmatic computer briefly engages all the valves in the car at once. This would mean that it would get the total current and total resistance of the whole system at once, and if that resistance is higher or lower than a preprogrammed value in the computer, it will throw the code and force airmatic into failure mode. However, there are codes for short circuit to to grounds on each individual valve, which is why I'm confused because the 5194 does not point to any specific valve despite the computer being able to read current and resistance of each valve individually. Also, as far as I can tell there is no way to code the programmed value in the computer to be higher or lower, at least not in DAS (I have vediamo but I would rather not mess with it and brick something since I have no idea what to do there).

Looking for some advice from an experienced technician preferably, as I keep getting bad advice about replacing various parts which have nothing to do with my problem.