Universal Theft Deterrent (UTD) System Operation

UNIVERSAL THEFT DETERRENT (UTD) SYSTEM OPERATION
The UTD system (when armed) is designed to deter vehicle theft by pulsing the horns and exterior lamps when an unauthorized vehicle entry is detected.
An unauthorized entry can be any of the following:
- Forced entry into the rear compartment.
- When any door is opened.

The Body Control Module (PZM) controls all alarm functions. when the PZM has detected an unauthorized entry, it applies ground to the Horn, Park Lamp and Headlamp relays once per second for approximately three minutes, or until a valid input to disarm is received. The PZM has five basic modes (disarmed, standby, delayed, armed, and alarm) for operating the UTD system. The different modes are described below.
1. The PZM has the UTD system in a disarmed mode until the following conditions are detected:
^ The ignition key turned to the LOCK position.
^ Any door open.
^ Doors locked by either the power door lock switch or the keyless entry transmitter (key fob).

2. The PZM detects these conditions and enters the standby mode. The PZM sends a Class 2 message requesting the IPC to flash the security indicator. (If all of the doors are closed and the key fob is used to lock the doors, the PZM goes directly to step 3, the delayed mode).

3. When the last door is closed, the PZM enters the delayed mode for 30 seconds (the time period may be substantially lower for vehicles with under 20 miles on the odometer). The PZM sends a Class 2 message requesting the IPC to illuminate (stop flashing) the security indicator.

4. After 30 seconds, the PZM enters the armed mode, the PZM sends a Class 2 message requesting the IPC to turn off the security indicator.

5. The PZM is now in the armed mode. Any forced entry activates the alarm mode.

If a door unlock request is received by the PZM during the arming sequence, the PZM will not arm the system. The PZM then sends a Class 2 message requesting the IPC to turn off the security indicator. To arm the system at this point, the arming sequence must be repeated.
The alarm can also be armed with the windows open.

Arming the System
To arm the system follow this procedure:
1. Close all the windows and place the shift lever in PARK.
2. Turn the ignition cylinder to the LOCK position and remove the key.
3. Open any door.
4. Lock the doors with the power door lock switch or the door lock button on the key fob.
5. Close all doors. The system is now armed.

Locking the Vehicle Without Arming the System
Follow one of these procedures for locking the vehicle without arming the system:
- Procedure A
1. Lock the vehicle using the manual door lock knobs.
2. Close all doors.

- Procedure B
1. Close all doors.
2. Use the key to lock the door or the power door lock switch, provided the doors are closed prior to locking.

Disarming the System
To disarm a system in the standby mode (security indicator flashing and the doors are open). Press the power door lock switch to the UNLOCK position, or the door unlock button on the key fob.

To disarm a system in the delayed or armed mode.
- Use the key to unlock the LH or RH front door.
- Press the door unlock button on the key fob.

Deactivating the Alarm
To deactivate a system in the alarm mode (horns sounding intermittently and headlights flashing).
- Use the key to unlock the LH or RH front door
- Press the door unlock button on the key fob.

SECURITY INDICATOR OPERATION
The PZM sends class 2 messages requesting the IPC to illuminate the security indicator. The IPC acknowledges these messages and controls the indicator to the desired state.

SYSTEM CHECK
Before beginning the system check, make sure that these components and circuits are working properly:
- Parking lights.
- Low beam headlights.
- Horn.
- Power door locks.

Alarm Mode Activation
To check that the system activates the alarm mode perform the following procedure:
1. Turn off the headlights and parking lights.
2. Open a window, so that the door can be unlocked from the inside, by using the manual door lock knob.
3. Place the system in the armed mode, refer to Arming the System.
4. Reach through the window and unlock the door using the manual door lock knob.
5. Open the door. The system enters the alarm mode, the horns sound intermittently and the exterior lights flash for approximately 3 minutes. After three minutes the system shuts down automatically.

Return System to Standby Mode
To check that the system returns to the standby mode perform the following procedure:
1. Place the system in the armed mode, refer to Arming the System.
2. Unlock the door with the key.
3. Open the door. The system does not enter the alarm mode. Although, the security indicator flashes indicating that the system has entered the standby mode.

Ignition Disarm Function
To check that the ignition disarm function operates perform the following procedure:
1. Place the system in the armed mode, refer to Arming the System, but remain in the vehicle.
2. Wait for the security indicator to turn off, thus indicating that the system is armed.
3. Cycle the ignition switch from OFF to ON, then back to OFF.
4. Open the door. The system does not enter the alarm mode. Although, the security indicator flashes indicating that the system has entered the standby mode.

SYSTEM COMPONENTS

BODY CONTROL MODULE (PZM)
The Body Control Module (PZM) controls all alarm functions. When the PZM has detected an unauthorized entry, it applies ground to the horn, park lamp and headlamp relays once per second for approximately three minutes, or until a valid input to disarm the system is received by the PZM. For additional information and diagnosis, refer to Computer System Diagnosis. Testing and Inspection

DOOR AJAR SWITCHES






The theft deterrent system uses door ajar switches in the door lock assembly as one method to activate the alarm. The PZM monitors the door ajar switches input, if the PZM detects any door open and the UTD system is in the armed mode, the alarm mode is activated.

Conditions which may activate the system intermittently.
A loose or corroded door ajar switch connector. Check the door ajar switch connectors for proper connection and repair or replace as necessary.

REAR COMPARTMENT LID LOCK CYLINDER TAMPER SWITCH






The rear compartment lid is equipped with a lock cylinder tamper switch which is activated by movement of the lock cylinder. Rotation and/or a in and out movement of the lock cylinder caused by a forced entry activates the lock cylinder tamper switch.

Conditions which may activate the system intermittently.
- A loose or corroded rear compartment lid lock cylinder tamper switch connector. Check the switch connector for proper connection and repair or replace as necessary.
- The retainer is not installed firmly to the cylinder. Reinstall the retainer or replace it with a new one.

DOOR LOCK CYLINDER SWITCH






The front door lock cylinders are equipped with switches to disarm the theft deterrent system. When the lock cylinder is turned to unlock the door, the switch grounds the disarm input to the PZM. The switch is serviceable separate from the lock cylinder.

REMOTE FUNCTION ACTUATOR (RFA) SYSTEM
The remote function actuator system can also arm and disarm the UTD system. when the RFA module receives a door lock or unlock signal from the key fob, RFA module sends a message to the PZM to perform the appropriate door lock/unlock command, via the Class 2 serial data line. The PZM detects the message, then locks the doors and enters the armed mode or unlocks the doors and enters the standby mode.