Principles of Operation: Notes

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

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

NOTE: The time out for the battery saver relay and the accessory delay relay (both are controlled by the SJB ) is 1 minute if the vehicle has less than 80 km (50 miles). Once the vehicle passes the approximate mileage threshold of 80 km (50 miles), the time out for both relays is 10 minutes, as described by the Owner's Literature. For the battery saver relay, refer to BATTERY SAVER . For the accessory delay relay, refer to GLASS, FRAMES AND MECHANISMS .

The SJB is a multifunction electronic module that controls many of the vehicle systems. Several SJB functions utilize hardwired inputs and/or outputs. The SJB controls the following hardwired functions, using the corresponding inputs and outputs:

INPUT AND OUTPUT FUNCTION CHART

Function	Input(s)	Output(s)
Autolamps	Headlamp switch Sunload sensor	Headlamps (low beam)
Daytime Running Lamps (DRL) (if equipped)	Headlamp switch Park brake switch	Headlamps (low beam)
Exterior lighting	Headlamp switch Hazard lamp switch	Exterior lamps/turn signal bulbs Trailer tow connector
Fog lamps (if equipped)	Fog lamp switch	Fog lamp relay
Headlamps	Headlamp switch	Headlamps (low and high beam)
Horn	Horn switch Integrated Keyhead Transmitter (IKT)	Horn relay (integral to the SJB )
Interior lighting	Door ajar switches Liftgate ajar switches IKT	Interior lamps relay
One-touch down driver window	Master power window switch	One-touch down relay
Power door locks	Ignition switch IKT Keyless entry keypad Door lock control switches	Door lock/unlock relays
Power windows	Master window control switch Passenger window control switch	Window motors
Heated rear window	Heated rear window switch	Heated rear window relay Heated rear window indicator
Rear windshield wiper	Wiper/washer switch	Rear wiper motor relay Rear washer pump motor

The SJB is involved in other vehicle systems through communication over the Controller Area Network (CAN). For a detailed list of the SJB network inputs and outputs, refer to MODULE COMMUNICATIONS NETWORK .

Some SJB parameters are programmable. Two types of programmable parameters are available: vehicle configuration and customer preference. Refer to MODULE CONFIGURATION for programmable parameters.