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 Cooling when Trailer
Towing
The cooling system may temporarily
overheat during severe operating
conditions. See Engine Overheating. ...
Control of a Vehicle
The following three systems help to control the vehicle
while driving—brakes, steering, and accelerator. At
times, as when driving on snow or ice, it is easy to ask
more of those control syste ...
Driving with a Trailer
Towing a trailer requires experience. Get familiar with handling
and braking with the added trailer weight. The vehicle is now longer and not as
responsive as the vehicle is by itself.
Check all ...