Hello X5 forum people!
First time poster, but have been a car guy for 32 years and owned Bimmers for 15 years.

Having a very similar issue, figured I would post in here so people can get more insight to the problem and solution for this:

2001 BMW X5 3.0, will not start, no clicking even coming from starter. Tested wire terminals to starter, thick one has 12.6 volts as it should, both starter solenoid contact wires go from 20mv (ignition off), to 50mv /34hertz (ignition on) on the black/green wire on the topside of solenoid. Bottom skinny wire on solenoid (black wire) goes from 20mv (ignition off), to 50mv (ignition on) with no hertz. No change from ignition on to start position on key.

Check out the oscilloscope readings for detailed patterns on the voltage.

Thanks for any input, it's greatly appreciated.

Attached Images

    

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2007 M5 V10 ESS Supercharged 750chp SMG
2001 X5 Topaz Blue/Tan 3.0
2005 X5 V8 M Sport Black on Black
2001 530i 5 Speed Turbo Project
and a number of other vehicles...