SL/R230: Thinking About Buying a 2007 SL550










Obviously meant in a good way. It's always good to know about potential risks, but in the end these cars are priced accordingly. Sounds like nice deal to me...
The hard top wouldn't go down (yes, the trunk divider was locked in place), the rear trunk wouldn't stay up, the automatic trunk closure wouldn't work, the key fobs wouldn't work, automatic entry wouldn't work, the climate control was acting strange, and the rear windows rolled down somehow but wouldn't roll up.
Additionally, there was a low tire pressure warning and a "temporarily unavailable" error.
The front tires need replacing as well.
Could all of this be symptomatic of a dead or faulty auxiliary battery?
As it stands, I'm going to renegotiate a lower offer or pass on it.
Last edited by Slider; Oct 31, 2020 at 06:19 PM.
The Best of Mercedes & AMG
The vario roof, radio and a few other convenience features need the convenience battery to be at a certain charge level. If the battery is not, then you get the "temporarily unavailable" message, until the battery charges, usually after driving the car for a while. I don't remember if the central locking system is also governed by the convenience battery, so your keyfobs might not be working because of it. You mentioned they had a trickle charger on the battery. If the battery is not holding a charge, it may need replacement.
The rear windows go down if you keep the windows switch pressed after the main windows went down. to put them back up, put the main windows up, then keep holding the switch, and they'll come up. The TPMS will show low tire pressure if the tire pressure is 25% below the recommended pressure, so that's just a matter of inflating the tire. If it still persists, and your tires are not loosing pressure, you can check the TPMS sensors. Check for slow leaks.
The other items you mentioned. The automatic trunk closure. If your car was so equipped, then it should fully open and close the trunk, but not all were so equipped. Mine is not. It has the soft close, but not automatic trunk lid.
As for the climate control acting strange, I don't know what that "strange" means to you. describe "strange"
Last edited by Dudeman; Nov 1, 2020 at 09:41 AM.
The vario roof, radio and a few other convenience features need the convenience battery to be at a certain charged level. If the battery is not, then you get the "temporarily unavailable" message, until the battery charges, usually after driving the car for a while. I don't remember if the central locking system is also governed by the convenience battery, so your keyfobs might not be working because of it. You mentioned they had a trickle charger on the battery. If the battery is not holding a charge, it may need replacement.
The rear windows go down if you keep the windows switch pressed after the main windows went down. to put them back up, put the main windows up, then keep holding the switch, and they'll come up. The TPMS will show low tire pressure if the tire pressure is 25% below the recommended pressure, so that's just a matter of inflating the tire. If it still persists, you can check the TPMS sensors.
The other items you mentioned. The automatic trunk closure. If your car was so equipped, then it should fully open and close the trunk, but not all were so equipped. Mine is not. It has the soft close, but not automatic trunk lid.
As for the climate control acting strange, I don't know what that "strange" means to you. describe "strange"
The climate control increased the fan speed if my finger bumped the middle rotary button, without actually turning the knob to the right. It seemed like an electrical glitch.
Last edited by Slider; Nov 1, 2020 at 12:16 AM.








The hard top wouldn't go down (yes, the trunk divider was locked in place), the rear trunk wouldn't stay up, the automatic trunk closure wouldn't work, the key fobs wouldn't work, automatic entry wouldn't work, the climate control was acting strange, and the rear windows rolled down somehow but wouldn't roll up.
Additionally, there was a low tire pressure warning and a "temporarily unavailable" error.
The front tires need replacing as well.
Could all of this be symptomatic of a dead or faulty auxiliary battery?
As it stands, I'm going to renegotiate a lower offer or pass on it.
Takes about 15-30 minutes of driving to get the car charged back up. I'd have the owner turn the car on or have him drive it around before you make another visit. Better to test everything with a charged battery
oh yea, the trunk not staying up in a very easy fix. I replaced mine in 10 minutes. Parts were like $30 from amazon






Summer Car 2007 SL550 and Winter Car 2012 S550 4-matic Designo, B&O



