Date registered: Dec 2008
Location: Potomac Falls, VA
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Use a multimeter and check the voltage of both batteries. I had the convenience functions temp unavailable the red battery. One by one i troubleshooted the problems.
had original aux battery that was 10.2v. replaced.- still code
fully charged the rear main battery in trunk - still code
replaced volt regulator on alternator - still battery code
front battery relay- still red battery code
bcm in trunk - no more red battery code or conve functions.
05 w/ 65,000 miles
06 E500 4Matic Sprt/Avant Package Pano roof 11/15/08
05 E55 -go fast mods, 496 rwhp / 530 torque 12/23/10