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Old 11-13-2006, 08:40 AM   #67
Geeezed lightning
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Joined: Jan 2006
Location: Baneberry, TN
Oddometer: 2,210
sweet. I'd heard about this but hadn't see details.

Originally Posted by rprade
The K1200S and the R1200GS have a connector near the front of the bike for connection to the GPS accessory. This connector has three wires:

Brown = ground (pin 1)
Blue/Green = TAA (pin 2)
Red/White = switched power (pin 3)

I will be hanging a scope off of the TAA lead next weekend, but I am fairly sure it is a conditioned speed pulse from the ZFE (chassis control module). This would be used by a GPS employing dead reckoning, not currently used by BMW. The Rostra unit also looks at an engine tach pulse and disengages the cruise control in the event of throttle runaway.

The Rostra has all of the electronics and a throttle servo in one module and can be purchased for about $200. Here is a link to Rostra controls website.
Great news. Plus I also have that unit already; just no time to install it or expiriment with it. Any plans on cable handling?

Thanks and keep us posted please!
Riding season is finally getting in gear!<br><br>Pat<br>aka Geeeze
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