The Universal Theft Deterrent (UTD) system is standard equipment on this vehicle. UTD provides an audible warning (using the vehicle horns) and/or lights in the event of an unauthorized entry through the doors, hatch/trunk or hood (export). The UTD is an internal function of the BCM which utilizes PASS-Key®, serial data , and various switch input information to perform UTD functions. The Powertrain Control Module (PCM) controls the fuel enable circuit. The BCM must exchange a unique password with the PCM to allow fuel enable processing to occur. If the BCM detects an illegal intrusion, the BCM will disable cranking and the PCM will not allow fuel delivery to the fuel injectors.

The BCM receives input information from various systems to determine what state of the UTD system should be in. The BCM can receive this information from either a direct input (hard wired) or from the serial data line. Refer to Theft Deterrent Diagnostic Information on how the BCM receives UTD inputs.

Inputs

The BCM monitors the following inputs affecting UTD:

Outputs

The BCM controls the following outputs for UTD:

The RFA system interacts with the UTD system (part of the BCM operation) in the following ways:

When one door, both doors or the hatch is opened, the SECURITY indicator on the instrument panel flashes as a reminder to arm the system. If after 10 minutes the door or hatch has not been closed, the flashing SECURITY indicator will turn OFF.

To arm the UTD system perform the following steps:

1. Turn OFF the ignition switch.
2. With the driver or passenger door open, press one of the power door lock switches. OR
3. Press the LOCK button on the remote transmitter or walk out of range with the passive switch ON.

This puts the UTD system in the active mode, where it has detected that the arming request has been made, but the vehicle is not yet secured (i.e. both doors are not shut). This state is indicated by the SECURITY indicator changing from flashing to ON continuously. If the vehicle is not secured after 10 minutes, the SECURITY indicator is turned OFF. It is important to note that the system will not be armed if the doors are locked manually; the power door lock switch or remote control transmitter (RFA) system must be used.

When the power lock switch or remote transmitter has been activated and both doors and the hatch are closed, the UTD is in the Doors and Hatch Armed State. In this mode, the UTD is monitoring for an illegal intrusion into the vehicle through the doors or hatch. This is the most common armed state of the UTD, as it represents the usual state of a driver leaving the vehicle with the security system set.

When the power lock switch has been activated and both doors are closed, but the hatch is open, the UTD is in the Doors Armed State. In this state, the UTD is monitoring for an illegal intrusion into the vehicle through the doors. If the hatch is closed, the change in state of the hatch ajar switch will not be considered an intrusion, and the alarm will not be activated. If the hatch is not closed, the UTD system will remain in the doors armed mode and will ignore the hatch ajar switch input and the SECURITY indicator will go out.

An illegal intrusion is defined as activity on any one of the following BCM inputs without the BCM first noting proper disarming of the UTD system:

If the BCM senses an intrusion it enters alarm mode. The BCM sounds the vehicle horns and/or flashes the lights (depending on selected personalize options) at approximately once a second, disables engine cranking through the PASS-Key® system, and the PCM disables fuel delivery. The alarm mode is active for approximately 2 minutes (30 seconds export) with the ignition and fuel system disabled. 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 kept OFF. The system must be disarmed or the intrusion condition removed after the time-out for the system to exit alarm mode and the BCM to re-enable the ignition and PCM re-enable the fuel system.

The UTD system is normally disabled by unlocking the door by using the door lock cylinder or remote transmitter. This allows normal owner entry into the vehicle without setting off the alarm.

To disarm the UTD system perform the following steps:

1. Insert the key in the door lock cylinder and rotate it as if normally unlocking the door.
2. Insert the correct Pass-Key® into the ignition lock cylinder on the steering column and turn ON the ignition switch.
3. Press the UNLOCK button on the remote transmitter or walk into range with the passive switch ON.

It is important to note that, somewhat like not being able to arm the system using the manual lock switch, manually unlocking the doors will not disable the UTD alarm mode. Also, using the power door unlock switch will not disable UTD alarm mode. Disconnecting the battery or pulling fuses will not disable alarm mode, since the BCM stores the theft deterrent status in the EEPROM, and will go back into alarm mode when the battery is reconnected. Only the three actions described above will successfully disarm UTD alarm mode.

The PASS-Key® system is a subsystem function of the BCM, which operates using an ignition key with one of 15 resistor pellets embedded in the key. The BCM samples the resistor pellet when the ignition is turned to the ON position. The BCM compares the resistor value in the key to a resistive window to which the PASS-Key® system has been programmed; refer to PASS-Key Programming . If the resistance of the key does not fit into the programmed window resistance, the BCM will not activate the vehicle theft deterrent relay, the steering column will remain LOCKED, and the PCM will disable fuel by disabling the fuel injectors. The PASS-Key® system operates independently of the UTD system; it provides protection even if the UTD system is not armed. However, when UTD is armed and enters alarm mode, the BCM disables cranking and PCM disable fuel delivery. The PASS-Key® system also will disarm the UTD system from its armed or alarm modes if the ignition key with the proper resistor pellet is inserted into the ignition lock cylinder and the ignition is turned ON.

BCM

The PASS-Key® system is a subsystem of the BCM. The BCM provides all the logic necessary to operate the PASS-Key® system. The BCM uses direct input information from other systems or components to determine the status of the PASS-Key® system. The BCM controls its output functions based on PASS-Key® status.

PCM

The PASS-Key® fuel enable function is provided by the PCM. When the BCM detects a PASS-Key® resistance value, the BCM and PCM must exchange the correct password in order for the PCM to enable fuel.

Ignition Cylinder and Key

The ignition is used by the PASS-Key® system to determine if the correct key is being used to start the vehicle. When the ignition is first turned ON, the BCM measures the key resistance through the sensing contacts located in the ignition switch.

Steering Column Lock

The PASS-Key® system is able to provide steering column LOCK functions. The BCM provides output control allowing the BCM to LOCK or UNLOCK the steering column electronically based on PASS-Key® status.

Theft Deterrent Relay

The PASS-Key® system can disable engine cranking through the theft deterrent relay. When the BCM detects the correct PASS-Key® resistance value, the BCM grounds the theft deterrent relay coil circuit, which allows the engine to be cranked.

Inputs

The BCM monitors the following as inputs affecting PASS-Key® system:

Outputs

The BCM controls the following outputs for PASS-Key®

When the PASS-Key® system detects an invalid key, the PASS-Key® system disables cranking and fuel enable for a time-out period of approximately 3 minutes. If a key is inserted or the ignition is turned ON before the 3 minute time-out is complete, the timer will reset to 3 minutes. Disconnecting the battery or pulling fuses will not disable the time-out; the BCM stores the PASS-Key® state in EEPROM, and will restart the  minute timer when the battery is reconnected. Even if the proper resistance key is inserted during the time-out the vehicle will not start until the total time period has expired.

The BCM and PCM operate in conjunction with each other to determine fuel enable. The fuel enable system uses a password exchange between the BCM and PCM after a correct PASS-Key® has been sampled by the BCM. The serial data line is used to communicate this password information from the BCM to the PCM. When the BCM stored password, is sent to the PCM over the serial data line, the PCM checks if the password matches its own stored password. If the password matches, the PCM will enable fuel delivery. If the password does not match, the PCM will disable fuel delivery and store a DTC.