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:
Interactive Drive Control System
The vehicle may have the Interactive Drive Control System (IDCS). IDCS adapts to the driving style and preference of the driver within one of three driving modes:
Standard: Use for normal city and ...
Trailer Towing (eAssist)
The vehicle is neither designed nor
intended to tow a trailer. ...
Add-on Electrical Equipment
The OnStar system is integrated
into the electrical architecture of the
vehicle. Do not add any electrical
equipment. See Add-On Electrical
Equipment. Added
electrical equipment may interfer ...