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Old 01-07-2012, 12:56 PM
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bluebee bluebee is offline
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Location: San Jose, California
Join Date: Mar 2008
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Mein Auto: 02 BMW 525i M54 auto 130K
Please REVIEW: Brake Pressure Sensor Diagnostic Test DIY

In keeping with the diagnostic nature of this thread, and, to further help a newbie who posted here:
- E39 (1997 - 2003) > Brake Pressure Sensor (DSC/ABS/BRAKE Trifecta)

I just snapped & annotated these pictures which should clarify which wires are for power, ground, and signal.

This shows how I removed the X1654 connector at the back of the brake pressure sensor:

With the connector off, the otherwise-diabolical Germanic connector seems outright simple:

The 1,2,3 numbering scheme is clear when you look at the BACK of the X1654 brake pressure sensor harness clip:

While all three pins are labeled in the rear, only pin #3 is labeled on the front of the X1654 brake hydraulic pressure sensor harness connector:

Putting it all together, we get something like this as a tentative DIY for testing the brake hydraulic pressure sensor.

While there is an active test (via DIS/INPA) of the brake pressure sensor ... here is a summary of the simpler-to-run VOLTAGE method of testing the brake pressure sensor.

Attached Thumbnails
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Last edited by bluebee; 01-07-2012 at 01:01 PM.
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