Autodata Technical Issue 14 – ABS warning lamp on and module not communicating on 2005 BMW 320d
Each month the Autodata team answers a common technical question and provides a printable document with technical diagrams to download and keep, exclusively for IGA members. This month a BMW 320d has it’s ABD warning lamp illuminated and windscreen wipers on constantly, and won’t communicate with diagnostic equipment.
Q. A customer’s 2005 BMW 320d has an ABS/ESP warning lamp illuminated and the windscreen wipers operate continuously. The ABS control module does not communicate with our diagnostic tool so we have no trouble codes. Is this something you have heard of before?
A. We are aware of this problem which affects BMW 3 Series’ with engine codes 20 4D 4, N46, N52 from 01/12/04-11/04/05. The cause of the problem is a loose earth strap located on the driver’s side suspension turret (Fig 1).
Thoroughly clean the earth point and ensure earth strap retaining nut tight. After carrying out repair check communication with ABS control module is possible and erase any stored trouble codes. Road test the car to confirm the repair.
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