Mustang V8-4.6L (2009)
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:
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Battery saver
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Convertible top (if equipped)
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Convertible top drop window function (if equipped)
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Exterior lighting
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Heated rear window (if equipped)
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Interior lighting
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Perimeter anti-theft (if equipped)
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Power locks
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Remote Keyless Entry (RKE)
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Tire Pressure Monitoring System (TPMS)
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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.
Special Tools Used With Diagnostics
Smart Junction Box (SJB)
