Principles of Operation
WARNING: This page is about a different car, the 2009 Ford Mustang. 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).
The SJB is a combination of a multifunction control module and an interior fuse panel. The SJB functions control multiple vehicle systems which include:
- Battery saver
- Convertible top (if equipped)
- Convertible top drop window function (if equipped)
- Exterior lighting
- Heated rear window
- Interior lighting
- Perimeter anti-theft (if equipped)
- Power locks
- Remote keyless entry (RKE)
- Tire pressure monitoring system (TPMS)
- Interfacing with the instrument cluster (IC) TPMS warning lamp and other warning chimes
The SJB is connected to the medium speed controller area network (MS-CAN) communication network. The SJB controls both interior and exterior lighting, body functions, active anti-theft functions (perimeter alarm), RKE functions, and the TPMS. The SJB receives wireless signals from both the RKE transmitters and the TPMS sensors via a TPMS/RKE antenna that is fixed to the exterior of the SJB plastic casing.
Refer to MODULE CONFIGURATION for programmable parameters in the SJB.