For 1990-2009 cars

### Circuit Operation

The universal theft deterrent (UTD) system is contained in the body control module (BCM). The UTD system allows a variable entry time into the vehicle before sounding the alarm. The UTD system is disabled when the ignition key is inserted into the ignition key lock cylinder and turning the ignition switch to the ON position. The UTD system consists of the following components:

• | Body control module (BCM)

• | Remote control door lock transmitter

• | Security indicator LED

• | Theft deterrent shock sensor

The use of the transmitter is the primary method of arming the UTD system. The transmitter has four push buttons which perform the following functions:

• | Lock the vehicle door and arm the UTD system

• | Unlock the vehicle doors and disarm the UTD system

• | Open the rear compartment.

• | Initiate the Panic mode during which the horns sound and park lamps flash

The side door lock switches can also be used to arm and disarm the UTD system. The security indicator LED flashes to confirm the system is armed. The LED is visible on top of the instrument panel to provide the system status and as a warning to intruders. The status of the UTD system can be determined by the output of the LED as described below:

1. The LED flashes once per second with a door open and the UTD system unarmed.
2. The LED is on steady when the UTD system is waiting for the doors to close before arming.
3. The LED flashes briefly every two seconds when the UTD system is armed.
4. The LED flashes twice every two seconds when the UTD system has sounded the alarm due to an impact to the vehicle.
5. The LED flashes three times every two seconds when the UTD system has sounded the alarm due to the opening of a door or the rear compartment.
6. The LED is off when the UTD system is off, disarmed, or the vehicle doors are open for longer than ten minutes.

The theft deterrent shock sensor detects impacts to the vehicle. The shock sensor determines the level of the impact to the vehicle and signals the BCM to sound one of the following alarm cycles:

• | For low level impacts to the vehicle, the BCM sounds the horn and flashes the park lamps twice.

• | For high level impacts to the vehicle, the BCM repeatedly sounds the horn and flashes the park lamps.

The shock sensor is ignored by the BCM under any of the following conditions:

• | The ignition switch is in the ON position

• | The rear compartment lid is open

• | Up to five seconds after the UTD system is armed

• | When feature customization is used to disable the UTD system

When armed, the UTD system will monitor the following to determine when to sound an alarm:

• | Ignition key lock cylinder

• | Theft deterrent shock sensor

• | Front side door locks

• | Rear compartment lid ajar indication switch

The UTD system provides vehicle security along with PASS-Key® II by controlling the following:

• | Fuel enable

• | Starter enable

• | Audible alarm (horns)

• | Visual alarm (park lamps)