ABS sensor

[bmwperson]

Any ideas how to diagnose which ABS sensor went bad? My abs light is on... I really would like to avoid spending $200 on a obd1 code reader.. The sensor has 3 pins, Its a magnetic sensor I think, Im gonna measure the different resistance between the pins for all 4 abs sensors and see which one is the one that sticks out... am I even on the right track here? ;>

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Best Regards
Tom

 

[Bimmerlife]

It might not be a ABS sensor, I had the same problem. Changed ABS sensors but the light was still there. It was a bad ABS brain. I think it cost like $400.

 

[Kirby]

Yes, that is the procedure that GM recommends to ID a bad sensor. I have done this on a GM but not on a BMW, but it's got to be almost the same. The three wires are almost guranteed to be + voltage supply (could be 5 or 12 volts), ground and output pulse. Just make sure that you disconnected the sensors from the computer before doing the test.