Component Description
Handles, Locks, Latches and Entry Systems - without Intelligent Access (IA)
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 (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.
Integrated Keyhead Transmitter (IKT)
NOTE: The IKTs (Integrated Keyhead Transmitters) must have SA stamped on the keyblade. Conventional PATS (Passive Anti-Theft System) keys must have HA or SA stamped on the keyblade.
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). Conventional PATS (Passive Anti-Theft System) keys can also be programmed to the vehicle if requested by the customer.
Up to a maximum of 4 IKTs (Integrated Keyhead Transmitters) can be programmed. If more than 4 IKTs (Integrated Keyhead Transmitters) are programmed, INT KEY COULD NOT PROGRAM is displayed in the message center during the key programming procedure and the RKE (Remote Keyless Entry) function of that IKT (Integrated Keyhead Transmitter) 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 (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.
The BCM (Body Control Module) 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 (Body Control Module) 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 (Body Control Module). When the liftgate release switch is pressed, the BCM (Body Control Module) either releases the liftgate latch (manual liftgate) or sends a signal to the LTM (Liftgate/Trunk Module) to open the liftgate (power liftgate). The liftgate release switch only operates when the doors are unlocked.
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 (Body Control Module) when the liftgate release switch is pressed and the doors are unlocked.
For information on the power liftgate latch, REFER to Power Liftgate Latch .
Body Control Module (BCM)
The BCM (Body Control Module) controls the operation of the power door locks, keyless entry keypad, and the RKE (Remote Keyless Entry) system. The BCM (Body Control Module) receives direct input from all the liftgate release switch, keyless entry keypad, and the door lock control switches. 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. Depending upon the input received and if conditions allow, the BCM (Body Control Module) either locks/unlocks the doors or releases the liftgate.
When using a keyfob or an IKT (Integrated Keyhead Transmitter) to release the liftgate on vehicles without the police package option, the BCM (Body Control Module) uses a separate output to provide voltage directly to the liftgate latch. This allows the liftgate to be opened regardless of the ignition state.