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:
Antilock Brake System (ABS)
This vehicle has the Antilock Brake System (ABS), an advanced electronic braking system that helps prevent a braking skid.
When the engine is started and the vehicle begins to drive away, ABS checks ...
Removing the Flat Tire and Installing the Spare Tire
Take off the wheel cover or center cap, if the vehicle has one, to reach the wheel bolts.
1. Do a safety check before proceeding. See If a Tire Goes Flat for more information.
2. Turn the wh ...
Entry Lighting
If it is dark enough outside when you press the unlock
button on the remote keyless entry transmitter, the
interior courtesy lamps will turn on and stay on for about
40 seconds. The lamps can be ...
