Soft top and roll bar both are not working and I can't read codes from RST module via OBD1. I have 1990 R129 500SL with 16 port OBD1 diagnostic socket. I recently bought R129 from US for restoration project. When ignition on, position 2 (engine not running) the soft top alarm is on (sound), no light on soft top power button S84, pushing the soft top power button nothing happens, the same for roll bar button, however both windows work fine. So there is some juice in RST module. Fuses seams to be ok. Previous owner said he sent RST module to be repaired 1,5-2 years ago and paid 500 dollars and got it back fixed, but the soft top did not worked anyway.
I built code reader myself. It works, I was able to read codes from all the sockets except 10 which is for the RST module. When I push the code reader button, then code reader light lit up for 2-3 seconds as it should (also S84 button lit up) but after that nothing happens no flashing lights, nothing, so I can't diagnose RST module.
I checked the power coming to RST: power on X12 and Z11 on both was 11,5V and ground on X10 which had solid ground contact.
RB module is responsive and have 5 errors: codes 4, 5, 6, 7 and 8.
I have read many threads for days and can't find solution to my problem, therefore I'm starting new thread in hopes someone can help. Please help!
I built code reader myself. It works, I was able to read codes from all the sockets except 10 which is for the RST module. When I push the code reader button, then code reader light lit up for 2-3 seconds as it should (also S84 button lit up) but after that nothing happens no flashing lights, nothing, so I can't diagnose RST module.
I checked the power coming to RST: power on X12 and Z11 on both was 11,5V and ground on X10 which had solid ground contact.
RB module is responsive and have 5 errors: codes 4, 5, 6, 7 and 8.
I have read many threads for days and can't find solution to my problem, therefore I'm starting new thread in hopes someone can help. Please help!