[HumminNBoatin']

You need to take your center bezel off your dash and pull the On-star in the dash. Your harness plugs right into the back of it.

Pulling the center off the dash is a pain. open your center console and pull all the screws out to remove the lid and pull the bucket.

Shift the truck to first gear and use a torx bit to remove the set screw in the front side of the shifter. Then shift to N and pull straight up on your PRNDL and cup holders to remove that piece. Then remove all the necessary screws and bolts from the center console so that you can slide it backwards.

Then pull your dash tits down towards the center console. Is held in place by friction clips. The On Star unit is bolted in with small hex head bolts. 8mm I think.

Then your on your own. Let us know how it works out for you!