(CTD) Circuit Description

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, 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 (disarmed, standby, delayed, armed, and alarm) 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:
- Ignition key turned to the OFF position.
- Any door open (security indicator flashing).
- Doors 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 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 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 This is followed by a three minute time-out with the horn no longer active.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.

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

INPUTS
The RFA monitors the following inputs:
- Driver and passenger door ajar switches, class 2 message from the Left Front Door Module.
- Driver and passenger power door lock/unlock switches, class 2 message from the Left Front Door Module.
- Driver door lock cylinder switch, class 2 message from the Left Front Door Module.
- Rear compartment tamper switch.
- Transmitter LOCK/UNLOCK buttons, class 2 message from the Remote Keyless Entry (RKE).

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