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Old 12-14-2007, 05:40 PM
Registered User
Join Date: Nov 2007
Posts: 16
Unhappy probelms with soft 300sl 1991 going nuts

hi all I have a 1991 300 sl 129 when i got the car the storage compartment did not open i needed to open it manually then the roof will go in then manually close it agian. I tought it needed to be bleed so i opened the screw on the right side block it broke off so I replaced the block but now the roof is going nuts. When the roof is open and I try to close it the storage compartment opens the roof comes out and rest on the top latches but dose not lock if you lock it manually when I lift any part of the roof it unlocks the latches on its own from there on i need to every thing manually with the car off. If the roof is closed its opens the rear flap and storage compartment unlocks the top latches and just stays there at this point I need to manually push the roof back in to the storage compartment and close the lid but when I lock the right side the left one opens. The codes I am geting when the roof is open is 2,3,6,7,10,14,17 Any ideas were to start? Thanks

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Old 12-14-2007, 08:35 PM
Registered User
Join Date: Mar 2003
Location: Milwaukee Wisconsin
Posts: 1,150
Do you have this info?

Mercedes Soft Top Controller Reset Procedure. R129 1990 thru 12/93.

Locate the diagnostic connector: Under the black plastic cover over the hood-up switch on
the US passenger side of vehicle near the strut mount.

To recover codes from the soft top controller:

Connect a normally open (N.O. S.P.) switch between pin 1 and pin 10. A simple push button switch with leads or a short jumper lead will also work OK.

Short (close switch) 2 to 4 seconds to read error codes.
The lamp in red (operate) top switch ( in the console ) will flash out a number of pulses.
Count the pulses and see the chart.

Short (close switch) 6 to 8 seconds to erase error code.

There may be multiple codes stored, so read / erase until all are cleared or the problem
Is located.

Some codes may require reading / resetting twice before they will erase.

The codes that will suspend operation of a soft top on the R129 are 21, 22, 26, and 30.

A code of "1" indicates no faults and no hard top in place, while a code of "20" indicates no faults and the hard top is assumed to be on the car.

2 = Limit switch, LEFT locked, soft top storage compartment cover.
3 = Limit switch, RIGHT locked, soft top storage compartment cover.
4 = Limit switch LEFT closed, soft top storage compartment.
5 = Limit switch RIGHT closed, soft top storage compartment cover.

6 = Limit switch LEFT locked, soft top fabric bow.
7 = Limit switch RIGHT locked, soft top fabric bow.
8 = Limit switch LEFT closed, soft top fabric bow.
9 = Limit switch RIGHT closed, soft top fabric bow.

10 = Limit switch LEFT front locked, soft top.
11 = Limit switch RIGHT front locked, soft top.

12 = Limit switch soft top storage compartment open.
13 = Limit switch soft top fabric bow raised.
14 = Limit switch soft top down in storage compartment.
15 = Limit switch soft top up ( secondary closing speed ).

16 = roll bar retracted switch.
17 = Left window failed to lower (limit switch open), bad fuse, or window relay on controller.
18 = Right window failed to lower (limit switch open), bad fuse, or window relay on controller

19 = Vehicle speed signal to controller missing or illogical.

20 = Hard top installed, no faults.

21 = Controller module / soft top switch circuit open.

22 = Roll bar switch activated.
23 = roll bar control unit not functioning.
24 = Roll bar crash deployed.

25 = contradicting switch inputs.

27 = insufficient voltage.
28 = Speedometer signal is missing.
29 = Wheel speed from ABS control module missing.
30 = Top operation disabled (due to #29).
Resistance is Futile.
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Old 12-15-2007, 02:00 PM
Registered User
Join Date: Nov 2007
Posts: 16
thanks for your help

hi thanks for the help Is bleeding screws on the block related to the pressure for the roof it seems like the pressure is low to parts of the roof. I seen something that may be the key to the fault the roof was open i tried to close the roof the storage compartment opened the roof when up till and windsheild stayind about 2 inchs from the latches I swiched off the car then it fell to place started again and tried the roof but the latches did not lock fully i needed to lock them manually then i closed the lid of the compartment and pushed the flap down tried the swich for the roof to lock the flap but the rear locks did not clip in fully. The lid of the storage compartment unlocked. So I closed it manually. I think i need to change the name of this trend to "my xmas wich for my car" Thanks Gareth

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