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:
Electric Parking Brake Light
For vehicles with the Electric
Parking Brake (EPB), the parking
brake status light comes on when
the parking brake is applied. If the
light continues flashing after the
parking brake is re ...
Safety
Side-impact airbags and antilock brakes are available. ...
If a Tire Goes Flat
It is unusual for a tire to blowout while you are driving,
especially if you maintain your vehicle’s tires properly.
If air goes out of a tire, it is much more likely to leak out
slowly. But if ...
