I've been trying to determine why my buddy's reverse lights won't work on his 06' Automatic. Here's what we've checked/done:

1. Verified that there is no power getting to the lights when in reverse, even when wiggling the shifter.
2. Verified no blown fuses.
3. Replaced the switch in the transmission

Any ideas?

 

When you say, "replaced the switch in the transmission", are you referring to the transmission range sensor? I had the same thing happen to my 06 and the dealer replaced the range sensor under warranty.

 

Mine quit working after downloading my Predator, turns out it's controlled through the TPIM (Totally integrated power module), there was an update to it and after reflashing they're fine.