Circuit Operation

The Four-Wheel Drive (4WD) Indicator Assembly provides visual information about the operating mode and gear range of the driveline. Voltage is supplied to the IGN/GAU Fuse and Indicator Assembly with the Ignition Switch in START or RUN. The circuit is completed through the Selector Quadrant Switch, which provides a ground path to light various Indicator Assembly Lamps.

With the Selector Quadrant Switch in detent position 1, the "2WHL" Indicator Assembly Lamp is lit.

With the Selector Quadrant Switch in detent position 2, the "4 HIGH" Indicator Assembly Lamp is lit. At this time, the Front Axle Switch is closed and the Indicator Assembly Front and Rear Axle Display is lit.

With the Selector Quadrant Switch in detent Position 3, the neutral light is illuminated and the transfer case is in neutral.

With the Selector Quadrant Switch in detent position 4, the "4 LOW" Indicator Lamp is lit. At this time, the Front Axle Switch is closed, and the Indicator Assembly Front and Rear Axle Display is lit.

A signal is sent to the Four-Wheel Antilock Brake Module (4WAL) whenever the 4WD is engaged. This signal causes the 4WAL system to alter it's operation while the vehicle is in 4WD.