The PSE has to be the right one but it's not coded, just a drop in type thing.

I installed the new unit and everything worked.....then it didn't work.

I disconnected the battery...waited...reconnected...and it worked.....later when I tried, it wasn't working again.

Is there a relay some where in power line to the PSE?

Something I'm missing?

If this was a Harley or a Hot Rod this would be a piece of cake.

I find the electrical system to be so over engineered as to be dangerous (to my mental health), a few breakers could have done they same thing as the circuit board. Who's idea was it to put it there and with the circuit board on the bottom?

I'm not real happy with Mercedes at the moment.