Date registered: Sep 2012
Vehicle: 1990 MB 500SL
Location: Fishers, NY
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I am an old enthusiast and former independant dealer of both Mercedes Benz and BMW automobiles (1970's and 80's vintage).
After almost thirty years of operating my family's building business, I am returning to toys.
Recently I purchased a 1990 MB 500-SL (R-129) - which is newer than any other Mercedes Benz I have owned! Talk about aging one's self.
This particular car is in great shape, both cosmetically and mechanically.
It does have some electronic foibles, which I am learning may be pretty common. I am sure there has been some previous "jump-starting" in the car's history.
The top does not function - although I have had the top control module checked and reprogrammed.
The electronic heater control valve doesn't function, although I can turn the system off, so I can use the car. (It defaults to full heat, if left in the On position)
The top is my biggest concern, as it really renders the car useless to me.
With the top control module connected, and re-synched per the manufacturer's instructions, I can hear the top system trying to function. The deck lid unlocks, but the top remains in the down position. If I put the top up and lock it manually, the top will not electrically unlock from the windshield frame. If I unlock it manually, the top remains stationary in the up position.
With the control module in place, the windows work fine and the rollbar works fine. There is a warning bell sounding at all times, unless the top control module is unplugged.
To date, I have installed a new, correct battery and replaced a cracked ground cable. I have a set of new spark plugs and ignition wires to install, along with an air filter and fuel filter. (These just on general principle)
Then a trip to the dealer is planned for a diagnostic check-up and engine code rebooting.
But I don't believe the dealer will correct the top issue. At least not without a second mortgage on my home. And, the dealer has told me that they really do not have anyone familiar with the "old" cars.
I am certain that this is a common question, and I hope someone might point me to earlier posts dealing with the same issues.
Paul Van Scott