Component Description

Anti-Theft - Perimeter - with 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.

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.

The BCM (Body Control Module) sends the door lock control switch command over the MS-CAN (Medium Speed Controller Area Network) to the RFA (Remote Function Actuator) module. The RFA (Remote Function Actuator) module then locks or unlocks the doors depending upon the switch input.

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 RFA (Remote Function Actuator) 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. Based upon input from the keyless entry keypad, the RFA (Remote Function Actuator) module either locks or unlocks the doors.

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

Intelligent Access (IA) Key

The IA (Intelligent Access) key incorporates both the PATS (Passive Anti-Theft System) and the RKE (Remote Keyless Entry) transmitter functions in a single device. The IA (Intelligent Access) key must be located inside the vehicle for engine starting and on the outside for IA (Intelligent Access) features. During key programming procedures, the PATS (Passive Anti-Theft System) and RKE (Remote Keyless Entry) transmitter of an IA (Intelligent Access) key are both programmed into the RFA (Remote Function Actuator) module. The RFA (Remote Function Actuator) module accepts programming of up to 4 IA (Intelligent Access) keys. 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 for the key programming procedures.

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, and the door lock control switches. It receives messages from the RFA (Remote Function Actuator) module over the MS-CAN (Medium Speed Controller Area Network) for the lock/unlock status of the vehicle.

If the perimeter alarm is armed and the BCM (Body Control Module) receives an input indicating an unauthorized entry into the vehicle, 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.

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 the IA (Intelligent Access) keys and the TPMS (Tire Pressure Monitoring System) sensors. It communicates the TPMS (Tire Pressure Monitoring System) data to the BCM (Body Control Module) over the MS-CAN (Medium Speed Controller Area Network). The IA (Intelligent Access) key data is sent to the RFA (Remote Function Actuator) module through a dedicated single circuit network. REFER to Tire Pressure Monitoring (TPM) Module .

Remote Function Actuator (RFA) Module

The RFA (Remote Function Actuator) module controls the locking and unlocking of the vehicle. The RFA (Remote Function Actuator) module receives direct input from the keyless entry keypad, it also receives input from the TPM (Tire Pressure Monitor) module over a dedicated single wire network for the RKE (Remote Keyless Entry) and IA (Intelligent Access) features.

The RFA (Remote Function Actuator) module sends the lock/unlock status of the vehicle over the MS-CAN (Medium Speed Controller Area Network) to the BCM (Body Control Module). The BCM (Body Control Module) uses this information to determine the status of the perimeter alarm.

REFER to Remote Function Actuator (RFA) .