I don't know for sure but I thought there was a control unit under the driver's seat that had a reverse wire. Seems like I was looking for it when I hooked-up my aftermarket head unit. I decided it was too hard to get to without removing the seat. Download the wiring diagram from here.
Speaking of that, do you have and aftermarket head unit/Nav? Many people tap into the wire harness at the tail light to detect reverse. Then they run that wire up to the head unit under carpet various ways. Its possible it could be shorting.

 

Reverse lights are fixed. Removed drivers seat, 4 bolts (has reverse torx, used standard 10mm socket) and 2 wire harness plugs. One is for air bag yellow, other black. May have to remove black box (2 screws) attached to bottom of seat to get to yellow one. Found a bundle of brown wires crimped together and 3 blue and black wire crimped together. The wires HAD rubber boots taped to them. The tape came undone and boots slipped off exsposing the wires. Checked wires for bare spots, taped the wires and put the boots back on, taping everything up real good. Put seat back in. Reverse lights all good.
Hopes this helps anyone that has the same problem.

 

Thanks for the help. Fixed now.