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My 3 year old SL500 with 11,000 miles on the clock comes up with "Convenience functions temporarily unavailable" whenever the car is left more than 18 hours without a drive. Within 5 miles the battery recharges so it all kicks back in again. If I leave it a week, you even have to use the metal bit of the key to get into the car.
I took it to Mercedes Benz main dealers 2 weeks ago thinking they would fit a new battery but was told that they had detected a drain on the battery but didn't know where it was coming from. (They thought it might be a fault with the EIS, or maybe with the immobiliser)
I took it back in for further tests this week and was then told that they could not detect any fault, and that the battery was fine, and that they had just recharged the battery and that everything should now be fine.
2 days later the "convenience functions-----etc" is coming back on again.
Any ideas what is going on?
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