Operation CHARM: Car repair manuals for everyone.

General Information

The CTD system (when armed) is designed to deter vehicle content theft by pulsing the horns and exterior lamps for approximately 30 seconds when an unauthorized vehicle entry is detected. However, the CTD system does not affect engine starting.

An unauthorized entry can be any of the following with the CTD system armed:
^ When any door is opened without being unlocked by using the key to unlock either of the front doors or the UNLOCK command from a keyless entry transmitter.
^ Opening the rear compartment prior to disarming the CTD system.

The components of the system are:
^ Door jamb switches.
^ Body Control Module (BCM)
^ Front door lock switch.
^ Rear compartment courtesy lamp switch.