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Old 12-23-2012, 11:04 PM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
Originally Posted by itrcvc96 View Post
we plugged it up and all the problems were resolved.
Interesting. On the E39, if we did that, we'd have problems from not recoding the foreign ABS control module. I guess on the E38, you don't have to recode the VIN into the new (to the vehicle) module?

The problem is usually a single wheel sensor goes bad (wires or the <$100 sensor), or the ABS control module goes bad (a steel resistance-welded wire lifts off its bond pad, Bill kindly ran a full autopsy here). Debugging is best done with a DMM; an OBDII scanner can ONLY find "communication errors", i.e., it cannot tell a bad speed or pressure sensor from a bad ABS control module and will often report the wrong problem because it isn't inserted BETWEEN the ABS control module and the various sensors (see extensive reports by 540iman on this). The ABS control module costs ~$150 to $300 to rebuild, ~$500 to replace; if you put anything back on other than your original ABS control module, the VIN will need to be recoded (15 minutes with a GT-1 or Autologic or similar; impossible otherwise). You'll need to clear your OBDII DTC codes after you fix everything if you plan on passing smog tests that week (ask me how I know). If you need to replace a speed sensor, don't go aftermarket; get as close to OE as possible.
Please read the suggested threads and add value, either by pictures or by descriptions, so the next person stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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