I know it's not on the back wall on reg cabs. It's somewhere on one of the rear pillars and you can't take that panel off without taking down the roof lining. Dealer wants $40 unless they have to plug the computer up for something else.

 

Yes, the back wall is only for those with a rear seat.

 

most will charge 50-100 bucks....having 2 people to remove seat helps...I remember cussing mine out before I got pissed and just pulled....

 

The seat is a bit of a challenge, but it will come out. All you're doing is pushing a plastic piece a fraction of an inch to pop the clip out of place and it will lift up. I've only been able to get mine out by doing the passenger side first.

 

You don't have to take the headliner off to remove any of the side panels. I pulled all the panels off when I finished my audio system. Unless they changed something between '06 and '08, IDK.