i just hardwired my passport last night in my a e53... overall pretty easy

you need:

hardwire kit not the smartcord to do my install
phillips head
torx head 10 i think
flathead wrapped tape

its pretty much like the install on the from page, but use the flathead to remove both the front light assembly and the rear bmw assist assembly once you have those out you can use the torx to remove 4 screws...

fish the hardwire line through the front headliner

for mine i wiretapped the garage door opener line it was green with a brown stripe...

ground into a screw that touches the frame of the car

test... and put back together