Just installed an Alpine CD Changer in my 94 e320. According to Crutchfield's (Where I bought it) it is compatible and it does work. However, there is now a constant beeping sound coming through the speakers when it is in CD mode. Does anyone have a clue to why this is happening? Thanks

did you install the necessary protocol converter for it?

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon

In my 94 e320 Wagon, I'm using an Alpine CHM-S630 with a Percision Interface Electronics MBZ-ALP plug converter through Crutchfield. it appears to work well although not very skip resistant when hitting road bumps, maybe because I mounted in the First Aid kit sleeve.

I did discover one problem.
The Benz connecter has copper and the cable has alumimum. A greenish oxidation occurred and was interfering with the radio operation. Cleaned it well and used dielectric grease. That cured the problem (although I haven't checked it recently to see if corrosion is reoccuring).

Check the connector at the CD.

Bob