Tire Pressure Monitor (TPM) System

The Tire Pressure Monitoring (TPM) system monitors air pressure in the four road tires (excludes spare). Pressure in the spare tire is not monitored. There are two tire pressure monitoring systems available, a base system and a premium system. The base system does not specify how many tires are low or where they are located. The premium system does so.

The Base TPM system consists of tire pressure monitoring sensors attached to each road wheel through the valve stem mounting hole, a central receiver module Wireless Ignition Node (WIN), and an indicator lamp.

The Premium TPM system consists of tire pressure monitoring sensors attached to each road wheel through the valve stem mounting hole, a wireless control module (WIN), three wheel sensor transponders located in three of the four wheel wells, an electronic display, and an indicator lamp.

The TPM module decodes the RF signals transmitted by each of the vehicle's tire pressure sensors. The decoded information is used to determine if "warning" or "fault" conditions exist within the TPM system.

Upon detection of a warning or fault condition, the WIN will send a request to the module that controls the indicator lamp (and the text display if equipped with the Premium system) via the vehicle bus system to illuminate or flash the indicator lamp. Also, upon detection of a warning or fault condition, the electronic display will send a request to sound the "chime". The WIN will store all warning and fault conditions, placard pressure values and low-pressure threshold values (lamp ON and OFF) in memory that can be accessed through diagnostic communication. If new sensors are introduced to the vehicle, the data stored for the sensor being replaced will be deleted.

The WIN will store all wheel sensor IDs and locations and faults in memory that can be accessed through diagnostic communication. All other data values transmitted from each active wheel sensor (not the spare tire) shall be stored in the WIN memory. After a sensor has been replaced, the WIN automatically learns and stores the sensor ID's while driving continuously above 15 mph (24 km/h) for 10 minutes. The learning sequence will initiate when the vehicle has been stopped for more than 20 minutes.

Under the following conditions, the system may not function properly:

• The areas, facilities or devices that use similar radio wave frequencies are located in the vicinity of the vehicle.
• A radio device of similar frequency is used near the vehicle.
• Installing some form of aftermarket window tinting that affects radio wave signals
• A lot of snow or ice is stuck to the vehicle, especially around the wheels or wheel housings.
• Using tire chains on the vehicle
• The battery of the sensor has been depleted (approximate 10-year life span).
• A spare tire is installed.
• A tire without tire pressure sensor is used.
• Wheels other than manufacturer factory wheels are used.