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 system under its control and reports a concern in the form of a diagnostic trouble code (DTC).

Power Door Locks
Regardless of the key position, the SJB is powered at all times. When the SJB receives a signal from the remote keyless entry (RKE) transmitter or door lock control switch, 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 determined by the relay on the lock or unlock circuit.

Auto-locking
The auto-locking feature locks all the doors when all the doors (including the liftgate for wagon only) are closed, the key is in the RUN position, the transmission is in either a forward or reverse gear, the brake pedal has been pressed and released, and the vehicle speed is 5 km/h (3 mph) or higher. If any door becomes ajar, this feature relocks all the doors when the ajar door is returned to a closed position and all previous conditions are met.

Luggage Compartment Lid Release
The luggage compartment lid release releases the luggage compartment lid when the customer requests it be opened using either the RKE transmitter or the interior luggage compartment release button (which is hardwired to the SJB). When the SJB receives a ground signal to release the luggage compartment lid, the SJB supplies voltage to the luggage compartment lid actuator. The luggage compartment lid actuator then actuates to release the luggage compartment lid.

Keyless Entry Keypad
The keyless entry keypad is hardwired to the SJB. The SJB interprets the inputs from the keyless entry keypad and then controls the associated operation. The keyless entry keypad is illuminated for 5 seconds when any button is pressed. Additionally, it requests the illuminated entry feature to turn the interior lamps on. If a lock all doors code is entered, the illumination turns off, as well as requests the illuminated entry feature to turn off the interior lamps. Either the RKE transmitter or the keyless entry keypad supplies a signal to the SJB when pressed. The SJB then supplies voltage to the appropriate door lock actuator(s) to lock or unlocks the doors (including the liftgate for wagon only). The keyless entry keypad or the RKE transmitter can also be used to release the luggage compartment lid.

Smart Unlock
The smart unlock feature prevents the LH front door 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 the LH front door open, the SJB commands the LH front door to unlock.