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. ...

How the System Works
URPA comes on automatically when the shift lever is moved into R (Reverse). The rear display briefly illuminates to indicate the system is working. URPA operates only at speeds less than 8 km/h ...

Exterior Lighting
The exterior lamp control is located to the left of the steering column on the instrument panel. : Briefly turn to this position to turn the automatic lamp control off or on again. AUTO: Turn ...