Principles Of Operation

Handles, Locks, Latches and Entry Systems

Principles of Operation

NOTE: The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).

Power Locks

The SJB monitors the door lock control switches. When the SJB receives an unlock/lock command from either door lock control switch, the SJB energizes a relay (internal to the SJB) to supply the correct power and grounds for the door lock actuators.

Liftgate Glass Release

The SJB monitors the liftgate glass release switch. The doors must be unlocked electronically in order for the SJB to release the liftgate glass latch. When this condition is met and the SJB receives a request from the liftgate glass release switch, the SJB provides power to the latch release motor.

Remote Keyless Entry (RKE)

The SJB interprets radio frequency signals from the Remote Keyless Entry (RKE) transmitters. The SJB requests the illuminated entry feature to turn the interior lamps on when an unlock command is received. If a lock command is received, the illuminated entry feature turns off.

The RKE transmitter supplies a signal to the SJB when any button is pressed. The SJB then supplies voltage to the appropriate door lock actuator(s) to lock or unlock the doors and liftgate. The RKE transmitter can also be used to activate the panic alarm. On Explorer and Mountaineer, the RKE transmitter can be used to release the liftgate glass. On vehicles with memory, the RKE transmitter also causes the SJB to send a Medium Speed Controller Area Network (MS-CAN) message to the Driver Seat Module (DSM) to activate all memory features to the positions associated with the RKE transmitter being used.

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. 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.

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

The keyless entry keypad supplies a signal to the SJB when the buttons are pressed. The SJB then supplies voltage to the appropriate door lock actuator(s) to lock or unlock the doors or liftgate. On Explorer and Mountaineer, the keyless entry keypad can be used to release the liftgate glass. On vehicles with memory, the keyless entry keypad also causes the SJB to send an MS-CAN message to the DSM to activate all memory features to the positions associated with the personal entry code entered in the keypad.