See also:

Cellular and GPS Antennas
Avoid placing items over or near the antenna to prevent blocking cellular and GPS signal reception. Cellular reception is required for OnStar to send remote signals to the vehicle. ...

Rear Compartment Fuse Block
The rear compartment fuse block, if equipped, is located on the left side of the trunk behind a cover. The vehicle may not be equipped with all of the fuses, relays, and features shown. ...

Safety System Check
Now and then, check that the safety belt reminder light, safety belts, buckles, latch plates, retractors, and anchorages are working properly. Look for any other loose or damaged safety belt system p ...