Principles of Operation: Notes

WARNING: This page is about a different variant/trim than selected.

WARNING: The tire pressure monitoring system (TPMS) sensor battery may release hazardous chemicals if exposed to extreme mechanical damage. If these chemicals contact the skin or eyes, flush immediately with water for a minimum of 15 minutes and get prompt medical attention. If any part of the battery is swallowed, contact a physician immediately. When disposing of TPMS sensors, follow the correct procedures for hazardous material disposal. Failure to follow these instructions may result in serious personal injury.

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

The Tire Pressure Monitoring System (TPMS) uses tire pressure sensors located in the wheels to monitor the tire pressure of all 4 tires. Each sensor has a unique identifier that is transmitted to the SJB. TPMS functionality is integral to the SJB. These transmissions are sent approximately every 60 seconds when the vehicle speed exceeds 32 km/h (20 mph). The TPMS function compares each tire pressure sensor transmission against a low-pressure limit. If it has been determined that the tire pressure has fallen below this limit, the SJB communicates this on the vehicle communication bus to the IPC. The IPC then illuminates the TPMS indicator and displays the appropriate message(s) in the message center.

The E-Series has different front and rear tire pressures, the tire pressures must be adjusted and the tire pressure sensors trained following a tire rotation. Failure to train the sensors causes the TPMS indicator to illuminate.