Principles of Operation

Smart Junction Box (SJB)

Principles of Operation

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

The SJB is a combination of a multifunction electronic module and an interior fuse panel. The SJB functions control multiple vehicle functions which include:

- Battery saver
- Convertible top (if equipped)
- Convertible top drop window function (if equipped)
- Exterior lighting
- Heated rear window (if equipped)
- Interior lighting
- Perimeter anti-theft (if equipped)
- Power locks
- Remote Keyless Entry (RKE)
- Tire Pressure Monitoring System (TPMS)
- Interface between the Instrument Cluster (IC) TPMS warning lamp and other warning chimes

The SJB is connected to the Medium Speed Controller Area Network (MS-CAN). 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.

The SJB has programmable parameters that can be programmed using the scan tool. Refer to Information Bus for programmable parameters in the SJB.