SL/R129: Soft top issue
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2001 sl500
Soft top issue
I have a 2001 SL500 and have an issue with my soft top operation. I replaced the front hydrolic cylendars and when I tried to put the top up, the front locked in place as it should but the rear part with the window would only go about half way down and pop back up again. It continues to do this time after time. I can manually lock it in place but the alarm sounds and the light switch flashes on and off. I think it has something to do with the manual nut because I got it to go through a complete operation yesterday after clicking that nut. Any ideas// Thanks, Sam
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Joined: Jan 2006
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From: Atlanta, unfortunately
'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55
I am unfamiliar with the "manual nut". At any rate, I would checkout the limit switch inputs to the controller.
The following procedure is for cars built in calendar year 1994 or later. You'll need a basic electronic multimeter or other device for checking electrical continuity.
All the switches are wired between chassis ground and individual sockets of the top controller's X2 connector -- the larger of its two connectors. Access the top controller and disconnect X2. Observe that there are sockets arranged in three rows that are numbered sequentially (attachment).
You proceed by putting the top in "Position 1" and checking the open/closed state of 11 switches and then repeating the same for "Position 2". With the ignition off you check a state by measuring resistance between a switch's socket and chassis ground. Infinite resistance indicates a switch is open, resistance less than 1 ohm indicates a switch is closed. The information below describes the two positions, the eleven sockets to check, and what state to expect with each measurement.
Position 1 (Top closed, roll bar up)
Open: 4, 26, 44, 46
Closed: 7, 8, 11, 28, 29, 30, 45
Position 2 (Top open and stored in compartment with storage compartment cover open, roll bar down)
Open: 7, 8, 11, 28, 29, 30, 45
Closed: 4, 26, 44, 46
The attached chart shows what switch is wired to each socket.
The following procedure is for cars built in calendar year 1994 or later. You'll need a basic electronic multimeter or other device for checking electrical continuity.
All the switches are wired between chassis ground and individual sockets of the top controller's X2 connector -- the larger of its two connectors. Access the top controller and disconnect X2. Observe that there are sockets arranged in three rows that are numbered sequentially (attachment).
You proceed by putting the top in "Position 1" and checking the open/closed state of 11 switches and then repeating the same for "Position 2". With the ignition off you check a state by measuring resistance between a switch's socket and chassis ground. Infinite resistance indicates a switch is open, resistance less than 1 ohm indicates a switch is closed. The information below describes the two positions, the eleven sockets to check, and what state to expect with each measurement.
Position 1 (Top closed, roll bar up)
Open: 4, 26, 44, 46
Closed: 7, 8, 11, 28, 29, 30, 45
Position 2 (Top open and stored in compartment with storage compartment cover open, roll bar down)
Open: 7, 8, 11, 28, 29, 30, 45
Closed: 4, 26, 44, 46
The attached chart shows what switch is wired to each socket.
