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:
Vehicle Data Recording and Privacy
This GM vehicle has a number of sophisticated computers that record information about the vehicle’s performance and how it is driven.
For example, the vehicle uses computer modules to monitor and c ...
Turn and Lane-Change Signals
An arrow on the instrument
panel cluster flashes in the
direction of the turn or
lane change.
For vehicles with the side blind zone alert system, an
arrow in the outside mirror flashes when ...
Ignition Transmission Lock Check
While parked, and with the parking brake set, try to turn
the ignition to LOCK/OFF in each shift lever position.
• The ignition should turn to LOCK/OFF only
when the shift lever is in P (Park). ...