SERVICE Indicator (4WD/AWD) Lamp
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada. However, it is still accessible from the selected car via links, so may be relevant.
The SERVICE 4WD lamp is an integral part of the cluster and cannot be serviced separately. This lamp is used to inform the driver of the vehicle that a transfer case system malfunction. The SERVICE 4WD lamp is controlled by the transfer case shift control module via Class 2.