Posted lots of places. Use to be in OM in 98. Now? At some point (W211 - 2003?) a second battery was added which maintained voltage. You can attach a 9v battery to charging pin under hood. Won't work with cigar lighter on MB.

Windows express feature - open each window part way then close and continue to hold the button for 4 seconds before releasing. Test express feature and repeat if necessary.
Sunroof - open part way then close and continue to hold the button for 4 seconds before releasing.
Radio - Enter your code following the procedure in the Radio manual. Varies by radio model. Be careful as a mistake causes a wait cycle and the countdown only takes place with the ignition on.

FYI - If you call 1-800-FOR-MERCedes they will come to your house or work and install an MB battery, reset everything and recycle your old battery. That should also qualify you for 18mos of MB roadside assistance. A lot of MB owners have gotten 7-8 years out of MB batteries. Aftermarket 3-4 years is common.

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Good luck.






1998 E320 Wagon