You could try actual diagnosis instead of swapping parts out randomly.
Run it until it stops. Measure voltage at the motor, then at the switch
and then at the relay.
Work your way back from the motor to fuse 11. Be sure to check not just
the motor itself but the switch attached to the motor that goes to the
Odds are you have a cold solder joint in the wiper control unit, which
is a very common problem. But maybe not. The test light will tell you
for sure. As always, look also for grounding issues.
"C'est un Nagra. C'est suisse, et tres, tres precis."
What Scott said.
It's the height of silliness to swap stuff when you have no idea what to
swap. Frankly, based on the description, I would have replaced the Wiper
Switch first. The switch is telling the motor that it's okay to shut down
now, so it does. The transmission would make the wipers jump and grind, or
not go at all, and the motor would do pretty much the same thing. I'd have
guessed the switch before either of the parts you guessed.
I bought a wiper motor and it came with the wiper transmission. I was
also advised to change the motor by a bmw repair person. The swap of
those parts cost me $75. I had a 98 e39 to pick parts from on the
cheap. I even have the General Module,
The bmw repair person did tell me to also check the switch, but my e38
wiper was also acting up and a change of the motor solved that problem
and being that I was already schooled on the wiper repair and the
parts so cheap I did the easiest for me.. I never worked on the
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