I had removed all of the front fairing pieces, in order to expose all of the wiring necessary for the directional and auxiliary lights (
The B model appears to be pre-wired the same as the TC model); I didn't have any luck activating the Auxiliary Light wiring sockets via the Model B control tree "Mode" button. I did price out the cost of the TC Left-Hand Control Tree, it was $577; however, there wasn't a guaranteed that the TC switch would even work on my Model B, due to the CPU being mapped to a B model vs a TC model.
Example: Forum members have added the TC Rear luggage case & pillion seat onto their R 18 B; however, they have reported that the brake light functionality and such doesn't work, despite the wiring harness being in place on the B model. Their local BMW dealership technician couldn't get the TC luggage case brake light to work when retrofitted on the B model; so, I decided to replace the 12V DC socket with a single-switch in order to operate my Auxiliary Lights (
$12.00 on Amazon). The Auxiliary LED lighting draws less than 1 Amp; the Accessory Socket supports up to 5 Amps, where the CPU will shut it down, if that circuit's amperage exceeds the 5 Amp limit. The No. 3 Fuse [ 15A ], is the fuse associated with the Auxiliary Lights; this told me that there was some CPU intelligence behind that Accessory Socket. If anyone figures out a solution, I can always revert back to the OEM configuration; but for now, I'm using a simple switch as my solution.
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