See also:

Battery
The battery supplies power to start the engine and operate any additional electrical accessories. - To avoid break–down or failure to start the vehicle, maintain a battery with full cranking ...

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. ...

CD/DVD Player
The CD/DVD player can play CDs, DVD—As, MP3/WMA CDs, MP3/WMA DVDs, and DVD—Vs. The CD/DVD player will not play 8 cm(3 in) discs. Care of CDs and DVDs Sound quality can be reduced due to disc ...