Sunfire L4-2.2L VIN F (2002)
Body Control Module: Description and Operation
Body Control Module 1
The CTD system is an internal function of the Body Control Module (BCM) which utilizes class 2 serial data and various switch input information to
perform CTD functions. When the BCM detects an unauthorized entry, it activates the horns and exterior lamps.
When the BCM detects an unauthorized entry, the BCM enters the alarm mode. The BCM activates the horns and exterior lamps for 2 minutes. This is
followed by a three minute time-out with the horn no longer active. If no new intrusions are detected after the time-out, the horn is not active. The
system must be disarmed or the intrusion condition removed after the time-out for the system to exit alarm mode.
