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I had the exact same problem on my wife's 2001 SLK 320. The problem was the PSE unit that controls the locking and security system. This is a combined vacuum pump and electronics unit located in the passenger side of the trunk. It is easy to remove the PSE once the spare tire and jack are removed. It is wrapped inside a foam box that all comes out together. The cause of the problem is water flowing down the PSE wiring harness and corroding the connectors and circuit boards. A new PSE is about $1300.00. I repaired mine by disassembling the PSE unit and cleaning the corrosion on the circuit board with a dry tooth brush and replacing two of the connector pins. The pin replacement is not a job for a novice, but it can be done. Good luck.

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Q: 2001 SLK320 The dome light stays on all the time and sometimes the alarm will go off for no reason The alarm won't go off if I leave the doors unlocked Any clues Sleepless in CT?
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