See also:

Power Lumbar
To adjust the lumbar support, if equipped: - Press and hold the top of the control (B) to increase support to the top of the seatback and decrease support to the bottom of the seatback. - ...

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. ...

Leaving the Vehicle with the Engine Running
WARNING It can be dangerous to leave the vehicle with the engine running. The vehicle could move suddenly if the shift lever is not fully in P (Park) with the parking brake firmly set. And, if you ...