Re: The ultimate....
I found this in my notes when I was putting a garmin Ique into the BMW comm system. It was written by Mark and I think it may be what you need.
Colors are orange, blue and white.
A search will reveal wiring instructions, such as: Don't hook up the GPS's speaker ground wire to the ComSystem harness ground -- avoids heavy audio feedback).
Hope it helps,
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735,834 miles on touring motorcycles since 1990
IBA 45658 MOA167437
2000 LTC 90,600 miles KIA (new)
2003 LTE 164,188 miles Silver (Purchased with 1687)
2008 R1200RT 176,196 miles (Purchased with 16458)
2017 R1200RT 84,612 miles (new)
Total BMW miles 497,451
1982 GL1100 rode 84108 miles (bought with 12012 sold 96120)
1988 GL1500 rode 12067 miles (bought with 19893 totaled 31960)
1989 GL1500 rode 142208 miles (bought with 20302 sold 162510)
Goldwing miles 238,383