Normal Operation - Automatic Transaxle
When the transaxle is placed in REVERSE, the transmission control module (TCM) sends gear status information to the instrument cluster over the communication network. The smart junction box (SJB) receives transmission gear status from the instrument cluster over the communication network. When the SJB receives a message indicating the transaxle is in REVERSE, the SJB provides ground to an internal relay, which routes the voltage to circuit CBP12 (GN/WH) to the reversing lamps.