I have an R1200GS (2013) and have just fitted a HEX EZcan II to control, 1) Aux driving lights up front, 2) white emblem lights, 3 & 4) amber left and right turn on the emblem lights. All working fine.
I thought I'd like to add some extra stop/tail lights, so bought a strip of 12v red LEDs, cut it into 2 and fixed them vertically to the side of the number plate (UK, large yellow, at the rear).
As all 4 EZcan outputs were used up, I thought I'd chance tapping them off the bikes lights as spending another lump of money on another EZcan for just one circuit was too much for my wallet to bear!
Initially I wired them in parallel to the wire going in to the OEM rear stop/tail light (+ground) and they worked! I assumed that the small extra amperage wouldn't upset the bike's can bus and indeed they worked, dim on bike ignition, brighter, with the stop light when either brake is applied.
Then they stopped working, as did all the rear lights, with the dash error 'LAMPR !'
When I disconnected my added LED strips the fault goes away.
My question is:
Why did the strips work fine initially and now don't?
Do you know about the BMW GS can bus?
Why is it so upset all of a sudden?