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R1200RS + R1250RS Forum � 1200 RS technology � Electronics � ST2 Smart Brake Module wiring

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#1 | ST2 Smart Brake Module wiring datum

Fri Dec 18, 2020 1:39 am

I have fitted a ST2 smart brake module to my 2016 R1200RS that is supposed to light up the brake light when the bike is engine braking. The wiring diagram given doesn't match the colours on the tail light assembly. The instructions suggest that the colours on BMW are Grey/Red for power, Grey/Black for signal, and Brown for ground. On my bike, the colours are Grey/Black with a yellow dot. Brown/Blue with a yellow dot, and Brown. I have connected the module's Ground (Brown wire) to Brown, the Power (Red/Violet wire) to Brown/Blue with a yellow dot, and the modules signal (Grey wire) to Grey/Black with a yellow dot. It hasn't worked. The module itself is positioned perfectly horizontally on the bike as recommended but when tested the brake light does not come on when engine braking. Any suggestions?

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#2 | RE: ST2 Smart Brake Module wiring datum

Fri Dec 18, 2020 5:02 pm (Last edited: Sat Dec 19, 2020 5:27 pm)

I have a suggestion.
I have just finished wiring in a Skeene brake light module, and the Skeene installation instructions for the R1200RS say not to power their module from the tail light/stoplight connector, but to use the green/white wire in the connector at the front right of the area under the rear seat. In other words connect the ST2 ground and trigger wires as you have done, but connect the ST2 power wire to the bike's green/white. No need to even remove the front seat.
I would try that for powering your ST2 module.

Sorry but this forum is not allowing me to post a link to the Skeene installation web page.

Eventual master of the obvious

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#3 | RE: ST2 Smart Brake Module wiring datum

Sat Feb 06, 2021 10:04 am

DiverRider, did you successfully wire the STS brake light? I have just bought the same and your advice on the correct wiring would be welcome.
Thanks Boxerboy

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Improvement of lights? � � Has anyone installed Cyclops or Weiser LED turn signals/running lights?