Security Light

The security light should come on briefly as the engine is started. If the system is working normally, the indicator light turns off. If it does not come on, have the vehicle serviced by your dealer.
If the light stays on and the engine does not start, there could be a problem with the theft-deterrent system.
This light is also used to indicate the status of the anti-theft alarm system when the ignition is turned off. The light will flash rapidly if the alarm system is arming and one or more of the monitored entry points is not closed. The light will stay on if the alarm is arming and all entry points are closed.
For information regarding this light and the vehicle's security system, see Anti-theft Alarm System on page 2‑11.
See also:
Receiving a Call
When an incoming call is received, the audio system mutes and a ring tone is heard in the vehicle.
• Press to answer the call.
• Press to ignore a call. ...
Overview
The GMC Sierra All Terrain HD concept is an exploration of heavy-duty truck
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Reading Lamps
The reading lamps are located on the overhead console. These lamps come on automatically
when any door is opened.
For manual operation, press the button next to each lamp to turn it on or off. ...





