Operation CHARM
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Buick
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1999
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Regal V6-3.8L VIN K
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Repair and Diagnosis
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Powertrain Management
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Computers and Control Systems
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Testing and Inspection
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Scan Tool Testing and Procedures
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Scan Tool Data Definitions - Powertrain Systems
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Commanded Fan 1 / Commanded Fan 2
Commanded Fan 1 / Commanded Fan 2
Scan Tool Displays ON or OFF. Represents the
PCM
commanded state of the fan 1 (low speed) and fan 2 (high speed) control circuits.