1999 Mercedes CLK 430

Check under the seats for any brown glass bottles or perhaps any baggies with what appears to be dried parsley residue in them Seriously though, if possible have the customer bring the car back and undo the Sirius to see if the problem manifests itself again. If it does, move the ground elsewhere, and grab the Pink/Red at the ignition harness.

Found out the problem.  I put the Sirius sattelite antenna on the rear trunk lid.  Zip tied the wire to the bar of the lid.  Zip tied it so tight that that negative trigger input for the windows pierced through a weld on the bar.  How random is that?  Anyways, just letting you guys know to hack up the install and don't zip tie on Mercedes.  LOL!  Cool part was the Mercedes dealership told the owner that we did a very professional job and that it wasn't anything we hacked up that made the windows mess up.  She was actually very happy to hear that.  We're doing her other car next week.  Problem is it's another Mercedes. HAAAAA!