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Originally Posted by AW8
Would be intersted to know what the wiring kit actually does specifically in relation to DSC/Trailer stability and/or other electrical functions, (i.e. dash warnings etc if bulbs blow in trailer).
If you have time I would be interested to know whats involved in the instalation of the BMW wiring kit. It would be so good if wiring instalation is simple or involved.
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The wiring kit consists of a control module that plugs into the BMW vehicle harness, and then a harness from that module to the hitch area.
The module probably doesn't have much inside it, but it is a dedicated BMW part, not something that others will likely ever produce. Recommend you just get the OEM wiring kit.
The module causes the trailer stability program to function (it senses sway). It also de-activates the PDC back-up sensors on the rear when the trailer is connected, otherwise the PDC goes off every time you put it in reverse as it sees the trailer. The module takes a signal from the lighting circuits (stop, turn, tail) and powers up the harness without changing the load on the vehicle circuits, which could cause a sensing fault for a bad bulb. The module does not sense that bulbs are out on the trailer circuit if they do fail.
I installed the wiring module in about 15 minutes, as part of the hitch install. Hardest part was finding where to plug it in, and releasing the snap on the harness plug. It plugs in around the spare tire, runs through a rubber grommet in the rear pan, and to the hitch area. No special tools required.
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