Door Jamb Switches

The CTD system uses the door jamb switches in the door lock assembly as one method to activate the alarm. The driver door module (DDM) monitors all door jamb switches via a discrete input or the simple bus interface (SBI) from the other two door modules. If the RFA receives a class 2 message from the DDM that a door is open and the CTD system is armed, the RFA activates the alarm.

Remote Function Actuator Module (RFA)

The RFA system can arm and disarm the CTD system. When the RFA module receives a door lock or unlock signal from the transmitter, it performs the appropriate arm/disarm function. The CTD system is an internal function of the RFA which utilizes class 2 serial data and various switch input information to perform CTD functions. When the RFA detects an unauthorized entry, it commands the horns and exterior lamps on. The RFA has five basic modes for operating the CTD system

The different modes are described below:

1. The RFA has the CTD system in a disarmed mode until the following conditions are detected:

•	The ignition key is turned to the OFF position.

•	When any door is open the security indicator flashes.

•	The doors are locked by either the power door lock switch or the LOCK button on the transmitter.

2. The RFA enters the standby mode when the above conditions are detected. In standby mode, the RFA commands the instrument cluster to illuminate the SECURITY indicator via the class 2 serial data line. If all the doors are closed and the LOCK button on the transmitter is used, the RFA enters the delayed mode (step 3).
3. When the last door is closed, the RFA enters the delayed mode for 30 seconds. In the delayed mode, the RFA commands the instrument cluster to illuminate the SECURITY indicator via the class 2 serial data line.
4. After 30 seconds, the RFA enters the armed mode. In the armed mode, the RFA commands the instrument cluster to turn off the SECURITY indicator via the class 2 serial data line. Any forced entry activates the alarm mode.
5. When the RFA detects a forced entry, the RFA enters the alarm mode. The RFA commands the horn and exterior lamps active for 30 seconds. This is followed by a 3 minute time-out with the horn no longer active.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.

Important: The CTD system can be armed with the windows or sunroof open.

Inputs

The RFA monitors the following inputs:

Outputs

The RFA commands the Horn and the Light Control Module (LCM) to control the exterior lights.