This from my Tech CD.
1. Remove the rear hi-mount lamp ballast.
1. Disconnect the battery ground cable.
2. Remove the liftgate door trim panel (46404); refer to ?Section 501-05?.
3. Remove the two rear hi-mount lamp ballast screws.
4. Remove the rear hi-mount lamp ballast.
1 Disconnect the low voltage electrical connector.
2 Disconnect the two electrical connectors.
3 Remove the rear hi-mount lamp ballast.
2. Remove the three rear hi-mount lamp nuts.
3. Drill out the seven rear hi-mount lamp moulding rivets.
4. Remove the rear hi-mount lamp moulding.
1 Remove the two nuts.
2 Disconnect the washer hose.
3 Remove the rear hi-mount lamp moulding.
5. Remove the rear hi-mount lamp from the moulding.
Installation
1. Note: When the battery is disconnected and reconnected, some abnormal drive symptoms may occur while the vehicle relearns its adaptive strategy. The vehicle may need to be driven 16 km (10 mi) or more to relearn the strategy.
To install, reverse the removal procedure.
Use Heavy Duty Riveter to install the new rivets.