Component Description

Anti-Theft - Perimeter-without Intelligent Access (IA)

Component Description

Door Ajar Switch

The door ajar switches each receive a 12-volt signal from the BCM (Body Control Module) on independent circuits. When the door is closed, the door ajar switch is closed, routing the signal to ground. When the door is opened, the door ajar switch opens, interrupting the signal. The BCM (Body Control Module) interprets this as an open door.

The door ajar switches are part of the door latches and not serviceable separately.

Liftgate Ajar Switch

The liftgate ajar switch receives a 12-volt signal from the BCM (Body Control Module) on an independent circuit. When the liftgate is closed, the liftgate ajar switch is closed, routing the signal to ground. When the liftgate is opened, the liftgate ajar switch opens, interrupting the signal. The BCM (Body Control Module) interprets this as an open liftgate.

The liftgate ajar switch is part of the liftgate latch and not serviceable separately.

Door Lock Control Switch

The door lock control switches receive voltage signals from the BCM (Body Control Module) on the lock and unlock input circuits. When the switch is pressed to lock or unlock, the corresponding input circuit is routed to ground, signalling the BCM (Body Control Module) to lock or unlock the doors. The door lock control switches have a dedicated ground circuit.

Keyless Entry Keypad

The keyless entry keypad is a touch sensitive capacitive sensor. When a finger touches the keypad, it changes the capacitance of the sensor in the area of the finger touch. The keypad is then able to determine which area was touched and sends a ground signal to the BCM (Body Control Module) on the corresponding reference circuit(s). The keypad only works when touched with a finger. The keyless entry keypad may not work when gloves are worn. The gloves act as an insulator and do not allow the finger to change the sensor capacitance.

REFER to Keyless Entry Keypad for information on the operation of the keypad.

Integrated Keyhead Transmitter (IKT)

The IKT (Integrated Keyhead Transmitter) incorporates both the PATS (Passive Anti-Theft System) functions and the RKE (Remote Keyless Entry) transmitter functions in a single device.

During key programming procedures, the PATS (Passive Anti-Theft System) and RKE (Remote Keyless Entry) transmitter of an IKT (Integrated Keyhead Transmitter) are both programmed into the BCM (Body Control Module). REFER to Key Programming Using Diagnostic Equipment Key Programming Using Diagnostic Equipment or REFER to Key Programming Using Two Programmed Keys Key Programming Using Two Programmed Keys to program the IKTs (Integrated Keyhead Transmitters).

Passive Anti-Theft System (PATS) Transceiver

The PATS (Passive Anti-Theft System) transceiver reads any key that is placed in the ignition. When the ignition is turned to the RUN or START position, the BCM (Body Control Module) activates the PATS (Passive Anti-Theft System) transceiver. Once the transceiver is activated, it activates the key in the ignition and receives the key data. Once the transceiver receives the key data, it sends the data to the BCM (Body Control Module).

Liftgate-Trunk Module (LTM)

The LTM (Liftgate/Trunk Module) controls the operation of the power liftgate. The LTM (Liftgate/Trunk Module) also determines the liftgate position and sends a liftgate ajar status to the BCM (Body Control Module). REFER to Liftgate/Trunk Module (LTM) .

Tire Pressure Monitor (TPM) Module

The TPM (Tire Pressure Monitor) module is a receiving antenna that receives the wireless signals from RKE (Remote Keyless Entry) transmitters and the TPMS (Tire Pressure Monitoring System) sensors. It communicates the RKE (Remote Keyless Entry) and TPMS (Tire Pressure Monitoring System) data to the BCM (Body Control Module) over the MS-CAN (Medium Speed Controller Area Network). REFER to Tire Pressure Monitoring (TPM) Module .

Body Control Module (BCM)

The BCM (Body Control Module) controls the operation of the perimeter alarm. The BCM (Body Control Module) receives direct input from all the ajar switches, the hood switch, keyless entry keypad, the door lock control switches, and the PATS (Passive Anti-Theft System) transceiver. It receives messages from the TPM (Tire Pressure Monitor) module over the MS-CAN (Medium Speed Controller Area Network) for the RKE (Remote Keyless Entry) feature.

If the perimeter alarm is armed and the BCM (Body Control Module) receives an input indicating an unauthorized entry into the vehicle, or the ignition is turned to the RUN position without a programmed PATS (Passive Anti-Theft System) key, the BCM (Body Control Module) activates the perimeter alarm. When the perimeter alarm is activated, the horn sounds and both the turn signals and courtesy lights flash in regular intervals. REFER to Body Control Module (BCM) .