Operation CHARM
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Buick
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1998
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Riviera V6-3.8L VIN K
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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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Circuit Operation
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Cruise Indicator
Cruise Indicator
The instrument cluster receives cruise data from the Powertrain Control Module
(PCM)
over the UART serial data line. The instrument cluster converts the serial data and when commanded illuminates the CRUISE indicator.