Bernard,

I doubt there is a relationship between the problems you are having with the car's Bose/Amp Radio and PSE failure. Both items are notorious for failing in the early model S-Class MB. The BOSE 7 channel amp is guaranteed to fail - it's just a matter of time. The amps were manufactured with diodes that erode over time. The normal path of failure for the BOSE amps is cracking and hissing that you hear coming from the speakers that gets worse over time. I'm no electronics person, but I guess a sudden failure is possible for the amp. Maybe someone else can comment regarding this matter.

If the radio problem happened suddenly, especially if you've been rummaging around the trunk looking for fuses for your PSE pump failure, I would check the connecting cables to the rear radio tuner. The Becker radio you have is divided into 3 components. The head unit (this is what you are calling the radio in the dash), the tuner is located in the trunk next to the antenna, and the BOSE 7 channel amp. The amp is also located next to the rear Becker radio tuner in the trunk. The tuner has a fuse on the back next to where the cables connect. Check the tuner's fuse and all connecting cables.

Just a side note, if you decide to replace your own PSE pump located under your rear seat, you will need to get an adapter kit since you have the earlier model of PSE pump. Search on my id to see pictures of the new and old model PSE pump.

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Russell McMahon
Tulsa, OK
2001 CLK 320
1992 400se
1993 400e
2000 320ML