Operating Modes

The following are paragraphs that briefly describe the operation of each of the VTA operating modes.

• Enabling  - The Body Control Module (BCM) and the Radio Frequency Hub (RFH) must have the Vehicle Theft Alarm (VTA) function electronically enabled in order for the VTA to perform as designed.
• Alarm  - The VTA alarm output provides both visual and audible outputs; however, the time intervals of these outputs vary by the requirements of the market for which the vehicle is manufactured. In all cases, the visual output will be a flashing On and Off of the exterior turn signal lamps, while the audible output will be either a pulsing of the horn or, if the vehicle is equipped, the siren. For vehicles with the base version of the VTA, the inputs that will trigger the alarm include a change in the status of the ignition, the door ajar switches, the decklid/liftgate ajar switch and, in vehicles built for certain markets where they are required, the hood ajar switch. In vehicles with the premium version of the VTA, the inputs that will trigger the alarm also include any movement detected within the vehicle passenger compartment, or a change in the vehicle pitch or roll of greater than about 0.5 degrees.
• Arming  - Arming of the VTA occurs when the vehicle is exited and the key is removed from the ignition switch (without PEKG) and the switch status is Off or the status of the KIN (with PEKG) is Off, the exterior lighting is turned Off, the Lock button on the Remote Keyless Entry (RKE) transmitter is depressed, or the Lock button on the Passive Entry (PE) is pressed to lock the vehicle. For active arming to occur, the doors and the decklid/liftgate must be closed and the status of the ignition switch or the KIN must be Off when the RKE transmitter or PE handle Lock button is depressed. Arming will not occur if a key is in the ignition switch lock cylinder or a FOB with Integrated Key (FOBIK) is within the vehicle interior.

  Pre-arming of the VTA is initiated when a door or the decklid/liftgate is open when the vehicle is locked using a power door lock switch or when the RKE Lock button is pressed. Pre-arming will not occur if a FOBIK is within the vehicle interior. When the VTA is pre-armed, the arming sequence is delayed until all of the doors and the decklid/liftgate have been closed. The VTA will remain in pre-armed mode for up to 16 seconds after all doors and the decklid/liftgate have been closed.

  Once the VTA begins the arming sequence, the security indicator in the IPC will flash rapidly for about 16 seconds. This indicates that VTA arming is in progress. If the status of the ignition switch or KIN changes, if a door or the decklid/liftgate is unlocked or opened by any means, the security indicator will stop flashing and the arming process will abort. Once the arming sequence is successfully completed, the security indicator will flash at a slower rate, indicating that the VTA is armed.

  The VTA arming sequence will occur regardless of whether a door or the decklid/liftgate is open or closed, but the security indicator will illuminate solid and the open door or the decklid/liftgate will not be protected unless the door or the decklid/liftgate is closed when the VTA arming sequence first begins.

  On vehicles equipped with the hood ajar switch, the VTA arming sequence will occur regardless of whether the hood is open or closed, but the security indicator will illuminate solid and the engine compartment will not be protected unless the hood is closed when the VTA arming sequence first begins. Also, if the status of the hood ajar switch changes from open to closed during the 16 second arming process, the security indicator will switch from solid to flashing. Once the arming process is successfully completed, the security indicator will flash at a slower rate, indicating that the VTA is armed.

• Disarming  - Passive disarming of the VTA occurs when the vehicle is unlocked by depressing the Unlock button of the RKE transmitter. Once the alarm has been activated, this disarming method will also deactivate the alarm. Unlocking a door with a key will not  disarm the VTA or deactivate the alarm. On vehicles equipped with PE, if one of the valid FOBIK units is located outside the vehicle and within 1.5 meters (5 feet) of the driver or passenger front door handles, grab the Passive Entry (PE) handle and enter the vehicle, then press the Start/Stop/Button (SSB) to transition the ignition status to On. This requires at least one valid FOBIK be located within the passenger compartment of the vehicle.
• Power-Up Mode  - When the armed VTA senses that the battery has been disconnected and reconnected, it enters its power-up mode. In the power-up mode the armed alarm system remains armed following a battery failure or disconnect. If the VTA was armed prior to a battery disconnect or failure, the technician or vehicle operator will have to disarm the alarm system after the battery is reconnected. The power-up mode will also apply if the battery goes dead while the system is armed, and battery jump-starting is attempted. The VTA will be armed until the technician or vehicle operator has disarmed the alarm system. If the VTA is in the disarmed mode prior to a battery disconnect or failure, it will remain disarmed after the battery is reconnected or replaced, or if jump-starting is attempted.
• Tamper Alert  - The VTA tamper alert feature will illuminate an icon in the IPC when the ignition first transitions to On if the alarm was triggered and has since timed out, or if the battery has been disconnected and reconnected. This feature alerts the vehicle operator that the VTA alarm was activated while the vehicle was unattended.
• Anti-tilt And Intrusion Alarm Disabling  - The anti-tilt and intrusion alarm is an exclusive feature of the of the VTA. When this version of the VTA is armed, the UAM uses ultrasonic transmit and receive transducers to monitor the interior of the vehicle for movement and low gravity accelerometers to monitor vehicle pitch and roll. If interior motion or change in vehicle attitude are detected, the UAM sends an electronic message to the BCM over the LIN data bus to invoke the audible and visual alarm features.

  The anti-tilt and intrusion alarm features of the VTA can be disabled by depressing a button on the roof lamp unit during VTA pre-arming, while the security indicator is still flashing rapidly. A Light Emitting Diode (LED) unit next to the button is illuminated as a visual confirmation that the anti-tilt and intrusion alarm features disable request has been received. The default for the UAM features is enabled; therefore, the disable procedure must be repeated each time the VTA is disarmed, then armed again to prevent the system from monitoring interior movement and vehicle pitch and roll.