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Old 01-07-2012, 06:52 AM
kimokk kimokk is offline
**Bimmer DIYer**
Location: Alexandria, VA
Join Date: Dec 2009
Posts: 161
Mein Auto: 00 740iL, 97 M3, 06 X3
Originally Posted by bjay27 View Post

Iím almost certain the sensor should function regardless of the ABS/DSC unit,(as long as it has input voltage) as its function is to relay to the ABS/DSC unit an increased output voltage proportional to the hydraulic pressure exerted, and the ABS/DSC unit processes this signal.
To highlight an important point Bluebee and others keeps making, if you are reading code errors which point to the brake pressure sensor, you are only testing the ABS/DSC unit's 'interpretation' of the sensors signal (as is the case with any of the sensors) and so a fault code could mean a bad ABS unit or sensor or even both. Which is why this DIY is somewhat important, as it bypasses the ABS/DSC unit.
So if you want to bypass the ASC/DSC unit because you say the sensor should function regardless of the ABS/DSC unit why don't you pull out the module and run the test again on the brake pressure? This will eliminate the module as a unknown variable. If the test still does not work then it might be the module?

The modules on these cars are a common failure due to heat issues. Why doesn't the OP send in his module to have it tested by BBA remanufacturing? I think they only charge $55. Then we will know for sure whether or not the module is the issue. You can still drive the car without the module in place. Good luck.
BMW '00 740il w/230,xxx miles, DIY timing chain guides complete! M60 Manifold, BDC Throttle Body, Performance gearing 3.46 LSD, Magnaflow Mufflers
BMW '97 ///M3/2/5 w/105,xxx miles
BMW '06 X3 w/130,XXX
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