Operation CHARM
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GMC Truck
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2001
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S15/T15 Jimmy 2WD V6-4.3L VIN W
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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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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.