Principles of Operation

PRINCIPLES OF OPERATION

NOTE: The smart junction box (SJB) is also known as the generic electronic module (GEM).

The SJB receives inputs and delivers outputs to many of the electronically controlled features of the vehicle. The SJB constantly monitors the system under it's control and reports a concern in the form of a DTC.

Power Locks
The smart junction box (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 and Liftgate Glass Release
The SJB monitors the liftgate release switch and the liftgate glass release switch. The doors must be unlocked electronically in order for the SJB to release the liftgate latch or the liftgate glass latch. When this condition is met and the SJB receives a request from the liftgate release switch or the liftgate glass release switch, the SJB provides power to the corresponding latch release motor.

Keyless Entry Keypad
The SJB monitors the keyless entry keypad input. When the correct codes are entered into the SJB, the SJB carries out functions associated with the code entered. Based on input from the keypad, the SJB:
- Illuminates the keypad
- Locks all doors
- Unlocks the driver door
- Unlocks all doors
- Enters programming mode
- Enables/disables the autolock feature
- Enables/disables the auto-unlock feature
- Releases the liftgate glass latch

Remote Keyless Entry (RKE)
The SJB receives input from programmed RKE transmitters. Based on input from the RKE transmitter, the SJB:
- Locks all doors
- Unlocks the driver door (when stepped unlock is enabled)
- Unlocks all doors
- Releases the liftgate glass latch
- Activates/deactivates the panic alarm
- If equipped, issues a command to the power liftgate module to open the power liftgate
- Turns the interior lamps on (when unlocking) and off (when locking), provided the defeat switch on the dimmer switch is not active
- Sounds the horn once when LOCK is pressed twice within 3 seconds, and the doors are closed
- Sounds the horn twice when LOCK is pressed twice within 3 seconds, and any door is open
- Flashes the turn signals once for each time LOCK is pressed, and the doors and liftgate are closed
- If any door or liftgate is open, the turn signals will not flash when LOCK is pressed until all doors and the liftgate are closed.