"Harry Bloomfield" wrote in message
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Lee has brought this to us :
Plus the ability for the BCM to substitute a failed lamp for an
alternative is quite useful. If sometimes confusing

Mine can substitute a brake light fed on a lower voltage for a failed tail
light.


And I'd argue that as long as you are using the right parts, it makes
wiring a trailer socket many times easier...though it obviously costs
more than using generic adapters

Using the correct BMW gubbins, I had to run a single HD cable from the
engine fusebox to the rear, then a data cable from the module to the LSM
which monitors the entire car and trailer's road lighting system.

Totally OT IMHO.