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Chevy Truck
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1999
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C 2500 Truck 2WD V8-5.3L VIN T
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Repair and Diagnosis
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Instrument Panel, Gauges and Warning Indicators
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Description and Operation
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Indicators
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4WD Indicator
4WD Indicator
The 4WD indicator is in the instrument cluster. When the shift lever is placed in 4WD, the VCM/PCM uses class 2 serial data communication in order to send a message to the instrument cluster when to turn ON the 4WD-indicator lamp.