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91 500SL, 93 600SL, 95 S600 coupe, 97 S320, 99 ML430, 2003 CL600, 94 SL600, 97 Kawasaki 1100 STX
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Hi guys,

My name is Victor and I work on Mercedes cars in my spare time. Mostly I rewire throttle bodies. Used to rewire engine harnesses but only do V8 and V12 ones now due to lack of time for others. Some people might know me here from my site restoreyourmercedes.com.
Looking to buy used BAD soft top controller for parts for good price :) Bellow is a story:
I'm in process of repairing soft top controller on new to me 1991 500SL, part number 1298200097. I bought this car as a project and did a lot already, including resealing cylinders, adjusting idle air valve, new O2 sensor, lower wiring harness, throttle actuator potentiometer repair, all vacuum leaks repaired, mixture adjusted, door lock pump repaired, window regulator on driver side, new brakes, A/C repaired, little cosmetic issues sorted. But I still in fight with soft top controller. First, I/O OKI chip was blown and transistor on relay board was bad, replaced both and roof started to work at least. Then diode for keyless entry unit was found blown. Cannot find any markings on it as it's tiny so I put regular diode in its place. I think its a Zener type though. But still have a problem with controller:
Everytime I put ignition on drivers side window goes down and cannot be closed. Passenger side window doesnt work also. Roll bar switch lights blink very fast, about 10 blinks a second, roof light stays on red. Now, if I remove the key, wait ten seconds, put ignition back on drivers window will start working, lights on switches don't blink. Passenger window doesnt work though. I press roof switch and roof opens normally and passenger window opens. So controller sends signal to window relay but it doesnt recognize signal from window switch. After roof opens windows close and at the end of cycle either roof light stays lit or roll bar light start blinking fast. If I reset the key in ignition and wait 10 seconds again roof and roll bar lights go out and roof works again.
I have few more chips on their way as I checked ALL diodes and transistors and all check out OK. Replaced capacitors on relay board just in case as they could be dried after all these years. So at this point one of chips is bad and I will replace all chips while at it. One problem is I suspect main processor to be at fault. Hopefully its OK and processor voltage control chip is bad. But even if I buy new processor I cannot reprogram it. Therefore looking for burned controller to break it for parts.

If anyone has one laying around please let me know how much do you want for it.
This car still needs lots of work so I live with the way roof works for now but afraid one day it will not close when needed, in the thunderstorm :)

Please let me know.

Best regards,

Victor
 
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