110resto

2005 sl500. Message in dash saying convience features temporarily unavailable. Is there a reset or a fuse. Rear battery 2 years old, but always on trickle charger. Seats adjust, but steering column doesn’t.

BenzNinja

iTrader: (4)

check front I guess

as.thompson

I got that message after not driving my SL for a few weeks. The convenience battery is not too old. After driving it for a few trips around town the message didn't reappear.

A1EK

Test it by driving the car for a about 10 mins and the message on your dash should go out. If it does then your rear battery needs to be replaced or changed for a decent one. I have bought a brand new battery that was suppose to be OEM from a reputable store in the UK called Halfords and got the message you have, but it would go after driving for a bit.
I don't agree with having to have the battery on trickle charge, just get a genuine Mercedes battery from dealer which is what I did and I have never had any issues, even with leaving the car 3 weeks in the snow over lock down it starts up no issue with no dash errors.

110resto

Thanks, rear battery seems to be problem even though it’s been on trickle charger.

ml320x5

If I remember, the rear batt is a AGM kind, deep cycle. You need a AGM capable trickle charger. If car left undriven for few days or week, depends on cold weather or not, battery condition, the error message will show up. Don't forget the rear battery is 24/7 stand by, especially with keyless go!
If I don't drive mine for a week or so, message will show up. Less than that, no message at all. In my case, if the message show up after start, I usually wait a bit, shut it off and restart then everything back to normal.
Just for your reference.