Principles of Operation

PRINCIPLES OF OPERATION

The smart junction box (SJB) receives inputs and delivers outputs to many of the electronically controlled features of the vehicle. The SJB constantly monitors the systems under its control and reports a concern in the form of a diagnostic trouble code (DTC).

Power Door Locks - Without Memory
Regardless of the key position, the SJB is supplied voltage at all times. When the SJB receives a signal from the remote keyless entry (RKE) transmitter, the RKE keypad, or the door lock control switches, the SJB supplies a ground signal to the appropriate lock or unlock relay. The ground signal closes the relay which supplies voltage to the door lock actuators. The door lock actuators then actuate to a lock or unlock position.

Power Door Locks - With Memory
Regardless of the key position, the SJB and the driver door module (DDM) are supplied voltage at all times. When the SJB receives a signal from the RKE transmitter, the RKE keypad, or the either door lock control switch, the SJB sends a command to the DDM, through the controller area network (CAN), and a ground signal to the lock and unlock relays. When the LH door lock control switch is pressed the DDM receives the lock or unlock signal. The DDM will send a request through the CAN network to the SJB to lock or unlock the passenger doors. The SJB then responds to the DDM request, authorizing a lock or unlock of the driver door by the DDM. The DDM then supplies voltage and ground to the driver door lock actuator based on the lock or unlock request. The ground signal in the SJB closes the relay which supplies voltage to the remaining door lock actuators. The remaining door lock actuators then actuate to a lock or unlock position determined by the relay.

Autolock
The auto locking feature locks all the doors when all the following conditions are met:
- the doors are closed.
- the key is in the RUN position
- the transmission is shifted to any gear putting the vehicle in motion
- the vehicle reaches a speed greater than 20 km/h (12 mph)

This feature relocks all the doors if any door is opened then closed, the vehicle speed goes below 15 km/h (9 mph) and then exceeds 20 km/h (12 mph).

Auto Unlock
The auto unlocking feature unlocks all the doors when all of the following conditions are met:
- all the doors are closed
- the key is in the run position and the vehicle was in motion at a speed greater than 20 km/h (12 mph) since the last key start. Then the vehicle comes to a stop and the key is turned to the OFF or ACCY position
- the driver door is opened within 10 minutes of the key being turned to the OFF or ACCY position

The doors do not auto unlock if:
- the doors are locked using the door lock control switches.
- the doors are locked with the RKE keypad or the RKE transmitter within 10 minutes of turning the key to the ACC or OFF position.
- 10 minutes elapse and the driver door is not opened.

Luggage Compartment Lid Release
The luggage compartment lid release system is inhibited when the vehicle speed exceeds 8 km/h (5 mph). The luggage compartment lid latch releases the luggage compartment lid when the customer requests it be opened using either the RKE transmitter, RKE keypad, or the luggage compartment lid release switch (which is hardwired to the SJB). When the SJB receives a signal to release the luggage compartment lid, the SJB supplies voltage to the luggage compartment lid latch. The luggage compartment lid latch then actuates to release the luggage compartment lid.

Remote Keyless Entry (RKE)
The RKE keypad is hardwired to the SJB. The SJB interprets the inputs from the RKE keypad and then controls the associated operation. The RKE keypad is illuminated for 5 seconds when any button is pressed. The SJB requests the illuminated entry feature to turn the interior lamps on when a valid entry code is received. If a lock all doors code is entered, the illuminated entry feature turns off. If enabled, the perimeter lighting turns on when the RKE transmitter unlock command is activated. When a RKE transmitter or RKE keypad lock command is activated the perimeter lighting is turned off.

NOTE: The RKE keypad does not lock the doors if the driver door is ajar.

Either the RKE transmitter or the RKE keypad supplies a signal to the SJB when pressed. The SJB then supplies voltage to the appropriate door lock actuator(s) to lock or unlock the doors. The RKE keypad or the RKE transmitter can also be used to release the luggage compartment lid. The RKE transmitter can also be used to activate the panic alarm. On vehicles equipped with memory, the RKE transmitter also causes the SJB to send a CAN message to the driver seat module (DSM) to activate all memory features to the positions associated with the RKE transmitter being used.

Smart Unlock
The smart unlock feature prevents the doors from locking with the key in the ignition lock cylinder. When the SJB receives a lock command from a door lock control switch, and the key is in the ignition lock cylinder with either front door open, the SJB commands all the doors to unlock.

The vehicle can still be locked with the ignition key in the ignition cylinder by locking the doors with the push button rods, the door lock cylinder or an RKE command from an integrated key or the RKE keypad.

Door Lock Control Switch Inhibit
As a theft deterrent, the door lock control switches and the luggage compartment lid release switch can be disabled 20 seconds after the key is turned to the OFF position and the vehicle is locked using the RKE transmitter, RKE keypad, or when the driver door is opened, and the power locks are locked with the door lock control switch then the driver door is closed.

The door lock control switch is enabled when the vehicle is unlocked by one of the following methods:
- the RKE keypad.
- the RKE transmitter.
- any door is opened from the vehicle's interior.
- the key is turned to the run position.

The door lock control switch inhibit feature is configured OFF by default. To enable this feature, refer to the Owner's Literature.

2-Stage and Global Unlocking
The vehicle can be unlocked using the RKE transmitter in either 2-stage or global unlock modes. In 2-stage unlocking the driver door unlocks on the first press of the unlock button and the rest of the locks unlock on a second press of the unlock button within 5 seconds of the first unlock button press. In global unlock all the door locks unlock on the first press of the unlock button.

The RKE system is toggled between 2-stage and global unlock modes by pressing the lock and unlock buttons at the same time and holding them pressed for 4 seconds. The turn signal lamps flash twice to confirm that the mode has been toggled.