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:
Door Ajar Messages
DRIVER DOOR OPEN
This message will display when the driver door is open. Close the door completely.
HOOD OPEN
This message will display when the hood is open. Close the hood completely.
LEFT REAR ...
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Notice: This vehicle has a specific coolant fill procedure. Failure to follow
this procedure could cause the engine to overheat and be severely damaged.
If no problem is found, check to see if cool ...
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If your vehicle has the Bose® audio system, your
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