Roll Bar Electrical Problem

[VJC]

Another 129 body member suggested I thread here as well as Tech Help...

1993 500 SL .. Roll Bar dash light comes on and switch light starts blinking intermittently now as often as every 10 minutes .. A quick push on the up or down side of the switch and all returns to normal. When pressed and held,the switch does bring the bar up and down.. What do I do and where is it located...

[tecqboy]

Search the forum or see if this makes sense. Roll bar and top controller reset are similiar, so read the whole thing. A made up a simple "tool" to do this, as I seem to have to reset at least once per summer.

Roll Bar Codes and Reset Procedure.

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

Connect a normally open (N.O. S.P.) switch between pin 1 and pin 7. A simple push button switch with leads or a short jumper lead will also work OK.
You will also need a 12 V LED with resister from Radio Shack.

To recover: Short pin 7 to ground 2 secs (Pin 1) with switch and LED + lead to pin 16 (+12V) - lead to pin 1 ground.

Count flashes.

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

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



Mercedes Soft Top Controller Reset Procedure. R129 1990 thru 1995.

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 red 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.

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.

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).