Bravada V6-4.3L VIN W (1997)
Four Wheel Drive Indicator Lamp: Initial Inspection and Diagnostic Overview
Circuit Operation - Four-Wheel Drive Indicator
The Four-Wheel Drive (4WD) Indicator Switch provides visual information about the operating mode and gear range of the driveline. Voltage is
supplied to the GAUGES Fuse and Four-Wheel Drive Indicator Switch with the Ignition Switch in START or RUN. The circuit is completed through the
Indicator 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 Switch Front and Rear Axle Display is lit.
With the Selector Quadrant Switch in detent position 4, the 4 LOW 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.
A signal is sent to the Four-Wheel Antilock Brake Pressure Modulator Valve (PCM applications) or Vehicle Control Module (VCM) whenever the
4WD is engaged. This signal turns off the 4WAL systems to prevent operation during 4WD operation.
Troubleshooting Hints - Four-Wheel Drive Indicator
1. Check condition of GAUGES Fuse. If fuse is open, locate and repair overload. Replace fuse.
2. If fuse is not open, proceed with the following diagnostics.
