So I’ll start at the beginning last weekend I fly to MD to pick up a 2007 SL55 5000 miles not a great deal but it's a good deal been looking for 2 months and this I thought was overall the best. I pick it up last Saturday drive her home from MD to LI, NY no problems love the car.
I get in the car to go to work on Friday as soon as a start it the DIC tells me convenience options temporarily unavailable ok fine I put it in reverse and back to drive shut her down start it back up and she's fine (put the top down) and I’m off to work no problems rest of day. Today going down to friends house same thing but, on off trick don’t work drive to friends house park it help him out 2 hours later get in car same thing take out the book says nothing about it. Hit the reset button on the dash and boom it works put the top down come home. about a hour ago after falling asleep on my couch waking up startled that I left the car with the top down and in the driveway I go out side to pull it in and put the top up and a light is on that says BRAKE something about hold down pedal who knows I start it and same thing as before no convenience options so I try to reset it and the car freaks out starts calling someone BRAKE all kinds of stuff for like ten minutes and then it works…… ANY IDEAS? Please don't tell me I bought a lemon, is there a master reset? Pull the battery terminal,etc. I looked around the forum for a similar situation but I don’t see one any help would be great thanks all
Ken
P.S. so the saga continues when i shut car down still sounds like something is on light buzzing noise under the radio. any ideas??? also dont know if this is normal but i can turn the radio on when the car is off?
Unless there's something unusual in your SL's history, your car is covered by the M-B warranty. So call a dealer and get it fixed. If it won't start, then call M-B's roadside assist and they will dispatch the local dealer to come to your location to address things like a dead battery or you can also have the car towed to the dealer.
WRT SL batteries, here's some useful info I found at another site posted in 2004 by BlueSL (still pretty much valid today):
"There are two batteries in the car to address the problem of not being able to start the car after a period of standing idle.
The smaller battery in the engine compartment is used to start the car, not just the starter motor, but the ignition, fuel pump and engine management and is designed to have the absolute minimum of static current drain to allow you to start the car even after several weeks. The alternator charges both batteries.
The larger battery in the trunk powers everything else and can also start the car if the small battery is dead. However, the larger battery powers everything else in the car, including those items which are never switched off and this battery quickly looses its charge when the car is not used. I estimate that after 10 days, it's lost 50% of its charge. If the battery is not sufficiently charged when you start the car, some items will not work, for example the roof and you get the "Electrical Consumers Offline" message. When the battery is charged up by the alternator, the message goes away and in theory, everything starts working. It does look like there's a problem with some part of the car when this happens though. My air-con goes hay-wire until I stop the car, switch off and switch back on.
If you put an ammeter in the circuit, you see the current drain from this battery decrease over a period of about a minute after the car is locked as the various systems shut down. When all is quiet, the car is consuming a few watts of power only but this is enough to drain the battery over a couple of weeks.
If the battery is flat, you cannot get into the car with anything other than the mechanical key because the central locking is dead. This is why they've dumped the card for keyless go because you are now forced to carry the real key with the mechanical insert to allow you to get into the car if the battery is flat.
So what is being run when the car is shut down? The interior motion sensor and alarm system, the central locking controller plus the internal network will be active.
As pointed out, both batteries will loose their charge over time anyway due to "internal discharge". Trickle charging the car should not be a problem, especially if its in a reasonably well ventilated space."
07 SL55 SO SAD 
Linear Mode
