Quote:
Originally Posted by andrewwynn
It also controls the electric brakes of a traiker if it has them
Sent from my iPhone using Tapatalk Pro
|
By "control" do you mean it activates them? While this is functionally no different than activating electric brakes via either the brake lights or the brake light switch (as was done in my car when I got it - rather badly too - I ripped it all out) BMW have made provision for electric trailer brakes via the trailer module: -
Information from the 1st Page of BMW’s Tow Bar Installation
Instructions:
"A connection pin for retrofitting (electric brake) is provided on
plug X393S. If an electrical brake is desired for the trailer, it
can be retrofitted. For the latest list of recommended brake
controllers contact BMW Service Hotline. The signal pick-off for
brake (the input to the brake controller) may only take place on
plug X12, Pin 10. This plug, X12, is to the Light Control Module
(LCM), the wire color is black and yellow. The male pin (BMW
P/N 61 13 1 376 195) should be used at the mating plug of
X393S. Be sure to observe this information."
There's also a lot of lighting connections between the car, the trailer module and the LCM. The trailer module performs the "check control" functions for the trailer lamps and passes this info on to the LCM. The LCM also possibly passes a "trailer connected" signal to the DSC/ABS to enable the DSC towing mode.