Operation CHARM
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Chevy Truck
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1999
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C 1500 Truck 2WD V8-4.8L VIN V
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Repair and Diagnosis
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Accessories and Optional Equipment
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Antitheft and Alarm Systems
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Description and Operation
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Content Theft Deterrent (CTD)
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General Description
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Door Key Switch
Door Key Switch
The BCM monitors the door key switches in order to disarm the CTD system. When the lock cylinder turns in order to unlock the door, the switch grounds the disarm input to the BCM.