Body Control Systems: Description and Operation

MODULE CONTROLLED FUNCTIONS

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

There are 3 multifunction electronic modules on this vehicle. They include the smart junction box (SJB), the driver door module (DDM) and the driver seat module (DSM).

Smart Junction Box (SJB)
The SJB is a combination of a multifunction electronic module and an interior fuse panel. It is located on the LH A-pillar, under the instrument panel. SJB functions control multiple vehicle systems, which include:
- Battery saver relay
- Brake shift interlock
- Delayed accessory
- Exterior lighting
- Global open (front windows only) (MKZ only, if equipped)
- Heated rear window
- Horn
- Interior lighting
- Moonroof (MKZ only, if equipped)
- Perimeter anti-theft
- Power locks
- Remote keyless entry (RKE)
- Tire pressure monitoring system (TPMS)
- Windshield wipers

Driver Door Module (DDM)
The DDM (if equipped), is located behind the LH front door panel. It controls the memory functions of the exterior driver memory mirror and, in conjunction with the driver seat module (DSM) (located under the driver seat), indirectly controls the memory seat functions. The DDM also controls the lock and unlock functions of the driver door lock actuator on vehicles with memory (seats and mirror) and receives lock/unlock input information from the door lock key cylinder switch and reset information from the driver door lock actuator.

Driver Seat Module (DSM)
The DSM (if equipped), controls the exterior passenger memory mirror and the memory seat functions.