At 2004 your car could be fully computerised and if so the circuits could be quite unconventional and so it isn't wise to delve too deeply without at least referring to a wiring diagram.
Computerised cars tend to use black boxes to carry out switching duties when they receive a (digital) signal from a switch or a sensor. An oscilloscope is as much or more use than a voltmeter when troubleshooting on such cars...
SOURCE: BMW 740IL Wiper Issue
try checking for a short to power on ur 12 volt comming into motor also check for a good ground at the plug for ur wiper motor
SOURCE: Windshield Wipers
Under the cowl (it is a plastic piece that the windshield wipers come out of) are the wiper arms that connect to the wiper motor. There are plastic parts that hold the wiper arms to the wiper motor. Lots of time these plastic parts dry out and break and the wiper arm will fall off the wiper motor. I would bet if you tried to move one of the wipers by hand both of them would move with little resistance. This would tell me that the wiper arms are disconnected from the wiper motor. The parts to fix this are easy to get. I know the motormite HELP line of parts used to have the plastic bushings to fix this problem.
SOURCE: windshield wipers in front wont work but rear wipers work
Hi! U need to check the switch and the wiring circuit that controls the motor.
SOURCE: windshield wipers don't move, but hear motor running
check the nuts on the wiper arms and make sure they are tight. If the nuts are tight then a linkage on the wiper transmission probably came loose or broke. You'll have to pull some cowling off to access it.
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