Component Description

Door Latch

The door latches are sealed units and contain the door lock actuator and the door ajar switch. The door latches can be lubricated if needed. Refer to Latch Lubrication .

Door Lock Control Switch

The door lock control switches receive voltage signals from the BCM 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 to lock or unlock the doors. The door lock control switches have a dedicated ground circuit.

Integrated Keyhead Transmitter (IKT)

NOTE: The IKTs must have SA stamped on the keyblade. Conventional PATS keys must have HA or SA stamped on the keyblade.

The IKT incorporates both the PATS functions and the RKE transmitter functions in a single device.

During key programming procedures, the PATS and RKE transmitter of an IKT are both programmed into the BCM. REFER to Passive Anti-Theft System (PATS), Without Intelligent Access (IA) - Key Programming Using Diagnostic Equipment or REFER to Passive Anti-Theft System (PATS), Without Intelligent Access (IA) - Key Programming Using Two Programmed Keys to program the IKTs. Conventional PATS keys can also be programmed to the vehicle if requested by the customer.

Up to a maximum of 4 IKTs can be programmed. If more than 4 IKTs are programmed, INT KEY COULD NOT PROGRAM is displayed in the message center during the key programming procedure and the RKE function of that IKT is non-functional.

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 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.

The BCM monitors for a ground signal on the keyless entry keypad signal input circuits. When an individual keypad button is touched, an individual or combination of the input circuits is routed to ground. The BCM then determines which button was touched based on which circuit(s) are grounded. The keypad has dedicated voltage supply and ground circuits.

Liftgate Release Switch

The liftgate release switch is a momentary contact switch that supplies a ground signal to the BCM. When the liftgate release switch is pressed, the BCM either releases the liftgate latch (manual liftgate) or sends a signal to the LTM to open the liftgate (power liftgate).

The liftgate release switch only operates when the doors are unlocked electronically. Additionally, vehicles with the police package must have the ignition in the RUN mode to release the liftgate latch.

Liftgate Latch

The liftgate latch contains the liftgate release motor and the liftgate ajar switch. The liftgate latch release motor is supplied voltage by the BCM when the liftgate release switch is pressed and the doors are unlocked.

On vehicles with a liftgate lock cylinder, a cable connects the lock cylinder to the liftgate latch. When a correctly cut key is used to open the liftgate, the cable manually releases the liftgate latch.

For information on the power liftgate latch, REFER to Body Closures , Power Liftgate Latch.

Body Control Module (BCM)

The BCM controls the operation of the power door locks, keyless entry keypad, and the RKE system. The BCM receives direct input from all the liftgate release switch, keyless entry keypad, and the door lock control switches. It receives messages from the TPM module over the MS-CAN for the RKE feature. Depending upon the input received and if conditions allow, the BCM either locks/unlocks the doors or releases the liftgate.