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:
Engine Coolant
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DEX-COOL® engine coolant. This coolant is
designed to remain in your vehicle for five years or
150,000 miles (240 000 km), whichever occurs
first ...
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as the parts with which your vehicle was
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Uplevel Headlamp Assembly
The uplevel model vehicle has a
high intensity discharge (HID) high/low beam, a dedicated DRL, and a
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