On my 1996 S420 the number #20 fuse keeps blowing as soon as you turn the ignition on, very sudden everytime. I definitely have a bad electrical short. The fuse chart states that this fuse pulls the (control unit and A/C compressor and the automatic climate control). I have unplugged the A/C compressor and the fuse still popped. I took the push button unit out and the fuse still popped. I am assuming the automatic climate control is the push button unit, right? What exactly is the 'control unit'? Any help would be appreciated.

That fuse also powers-up the center vent assembly, the "smog" sensor, and the das control unit.

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M.B. DOC could you tell me where the smog sensor and DAS control unit are that this fuse operates. Am I correct in my thinking that the automatic climate control is the push button unit? Thanks for the direction.