BMW 428I 2012–2015 — technical service bulletin
Bulletin 651914 · NHTSA communication 10149380 · issued Oct 1, 2014
Technical service bulletin
communication type
Back Over Prevention
component
2012–2015
model years
15
vehicle entries
Official summary
DWA Siren Malfunction. When the anti-theft alarm (DWA) is triggered, the horn comes on instead of the alarm siren. DWA internal monitoring is too sensitive.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.