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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Theft Deterrent System >> Description & Operation >> Content Theft Deterrent (CTD) Description & Operation >> 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.