You've checked the fuses in the trunk? There are two fuses: 16 amp. One for each window. The window switches in the console have been known to fail. With the engine off, but the key on, can you hear the relays click under the right rear storage compartment? The windows are activated by relays in the soft top controller under the storage compartment. If the relays click, the switches are OK. Have you pulled the error codes from the soft top and roll bar controllers? Has the car been up on a rack recently? That can set off the roll over switches on the axles and cause problems. Use the forum search function for additional info.

Mercedes Soft Top Controller Reset Procedure. R129 1990 thru 1994.

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

To recover codes for 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 the red top switch ( in the console ) will flash out a number of pulses.
Count the pulses and refer to the error list below.

To clear / erase a code: Short (close switch) for 6 to 8 seconds.

There may be multiple codes stored.

Some codes may require reading / erasing twice before they will clear.

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.

3.= Limit switch, right locked ,soft top storage compartment cover.
4 = left compartment cover closed switch
5 = right compartment cover closed switch
6.= left front latch switch.

10.= left rear latch switch.
11.= right front latch switch.

16 = roll bar retracted switch.
17 = Left window failed to lower (limit switch open).
18.= Right window failed to lower (limit switch open).

20 = Hard top installed, no faults.

23 = roll bar control unit not functioning.

25.= contradicting inputs.

27 = insufficient voltage.
28.= Speedometer signal is missing.
29.= Wheel speed from ABS control module missing.
30 = Top operation disabled (due to #29).



Roll Bar Codes and Reset Procedure.

Connect a 1K ohm resistor in series with an LED (+) anode to pin 16 (+12V) and the LED cathode (–) to pin 7. To recover: Short pin 7 to pin 1 ( ground ) with a push button switch.

Code 1 = No faults in system.
Code 2 = Roll Bar Control Unit
Code 3 = Voltage Supply
Code 4 = Driver Seat Belt Lock Relay (K18/2) open or short circuit to terminal 30 and/or 31
Code 5 = Passenger Seat Belt Lock Relay (K18/3) open or short circuit to terminal 30 and/or 31
Code 6 = Roll Bar Deployment Solenoid (Y57/1) open or short circuit to terminal 30 and/or 31
Code 7 = Left and/or right rear axle switch open or short circuit to terminal 30 and/or 31
Code 8 = Roll Bar Warning Lamp
Code 9 = Roll Bar Warning Lamp and/or impulse counter held too long to erase malfunctions
Code 10 = SRS Control Unit

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