See also:

Exterior Lamps Off Reminder
A warning chime will sound if the exterior lamp control is left on in either the headlamp or parking lamp position and the driver door is opened with the ignition off. ...

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. ...

Remote Keyless Entry (RKE) System Operation (Key Access)
The Remote Keyless Entry (RKE) transmitter works up to 20m (65 ft) away. Other conditions can affect the performance of the transmitter. See Remote Keyless Entry (RKE) System. Wagon Simil ...