2004 Hummer H2 Owner's Manual - Page 128

If your vehicle has a sunroof, it will have a crossrail stop tab placed in the siderail in the spot labeled SUN-ROOF STOP. This tab prevents you from moving the crossrails past the opening of the sunroof and loading cargo too far forward. Your vehicle will also have a stop tab in the crossrail in the spot labeled ON STAR STOP. This tab prevents loading cargo too close to the OnStar antenna which will cause the OnStar and navigation system (if equipped) to function improperly or not at all. Vehicles with the off-road lamps will have additional stop tabs placed in the siderails to prevent you from moving the lamps too far rearward, causing them to shine into the optional sunroof opening. The crossrails have built in channels to allow you to attach other items designed for this system, such as basket luggage carriers, bike racks, ski racks, etc. To use the crossrail channels, do the following: Crossrail Channels Notice: If you drive your vehicle through an automatic car wash that does not have enough clearance for any roof-mounted accessories (such as off-road lamps or a roof basket) on your vehicle, you can damage your vehicle. To avoid damaging your vehicle in a car wash, remove any roof-mounted accessories if you can, and do not use an automatic car wash while roof-mounted accessories are on your vehicle. See Cleaning the Outside of Your Vehicle on page 5-95 for more information. 1. Use the included key to unlock the crossrail end cap by turning it counterclockwise. If you ever loose a key, your dealer will be able to help you obtain a replacement. 2-48