Always "in" reverse

[dscoff]

I'd exhausted my search and self diagnostic avenues regarding this issue, so a post was the next step.
My '02 3.0 X5 with manual trans constantly thinks it's in reverse; that is the reverse lamps are always on and with the passenger side mirror is always tilted down (if the selector switch is in the correct position).
The reverse lamp switch is fine; I've tested it with a multimeter, tried a second one and tested it with a multimeter while installed (to make sure the selector rod was actually activating the switch.
The lamps etc stay on even with the switch disconnected, but there doesn't seem to be a short in the harness. I checked the resistance between the two sides of the plug and it's infinite (no connection/short).
Pretty sure it's a LIM issue at this point which probably requires the GT1. Just wanted to fish for some answers before shelling out money at a shop or for a GT1 of my own.
Thanks!
Jonathan