Replaced relay or flasher.?..May have both although I can't seem to find in realoem...not well labeled. I had to replace a flasher on my 1993 525it. Not exactly the same symptoms, left side only would work sometimes and stick on sometimes even with t/s switch in off position...cost me a left taillight lens. the flasher was located in the relay/fuse box at the left rear of engine bay.
I had the same problem, suddenly indicators & wipers stopped working but everything else did ... my Step Father said it sounded like a fuse, so off to the auto parts store and that fixed it on my 89 E34 535i auto.
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