1995 E300D M606 auto

I have no signal (ground or 12v) at the Klima from either the WOT switch or the PBU in any scenario. (I believe from a post from Sixto last year that I should have 12v from the WOT switch normally and a ground signal from the PBU when calling for a/c.) It seems a coincidence that there is nothing from either so I was wondering if there is a link between them other than at the Klima?

I have bridged 12v to compressor at Klima to do these tests and the system works.

can anyone advise , Sixto?

thanks
Keith

Check the overvoltage protection relay if you have one. It has a fuse on top that may need to be replaced. My kickdown switch, climate control and a/c compressor were not working one day and it was the overvoltage protection relay. Mine was located next to the klima by the battery behind the plastic panel.

__________________
-disav

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thanks for quick response I appreciate it.

I have tested the function of the OVP and it checks out ok (but could be intermittent I agree). I definitely dont have a ground signal from the PBU to the pressure switch although the wiring has continuity. Am in the process of examining the innerds of the PBU looking for a dry joint but none found so far.

Not sure how the OVP would stop the PBu grounding when PBU performing its other functions (valve control etc) ok - or is there something else I'm missing?

Keith