Principles of Operation

PRINCIPLES OF OPERATION

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

The SJB receives transmission gear status from the PCM through the instrument cluster gateway, over the communication network. When a message is sent over the communication network stating the transmission is in REVERSE (R), the SJB energizes an internal relay which supplies voltage to the reversing lamps.

The PCM sets DTCs if there are any concerns with the input from the transmission range (TR) sensor.