Operation CHARM
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Pontiac
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2000
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Sunfire L4-2.2L VIN 4
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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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Vehicle Theft Deterrent (VTD) Description
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Body Control Module (BCM)
Body Control Module (BCM)
The BCM compares the
Passlock
(TM) data value to a value that it has stored in memory. If the values match the BCM sends a password via the class 2 serial data line to the PCM.