Service All-Wheel Drive Light
This light should come on briefly when you turn on the ignition, as a check to show you it is working.
The service all-wheel drive light comes on to indicate that there may be a problem with the drive system and service is required. Malfunctions can be indicated by the system before any problem is apparent, which may prevent serious damage to the vehicle. This system is also designed to assist your GM dealer in correctly diagnosing a malfunction.
See also:
Charging System Light
The charging system light comes on briefly when the ignition is turned on, but
the engine is not running, as a check to show the light is working. The light turns
off when the engine is started. ...
Front Fog Lamps
For vehicles with front fog lamps, the button is located on the outboard side
of the instrument panel.
The ignition must be on to turn on the fog lamps.
(Front Fog Lamps): Press to turn
the f ...
Tachometer
The tachometer
displays the engine
speed in revolutions
per minute (rpm). ...