Wheels And Tires (G2166405): Description: Operation

Each time the vehicle is driven, the Tire Pressure Monitoring System (TPMS) learns the location of the four wheel-mounted sensors:

FL (front left)
FR (front right)
RL (rear left)
RR (rear right)

by combining Radio Frequency (RF) transmissions with data from the Anti-lock Brake System (ABS) control module.

NOTE: An ABS fault will not directly cause the TPMS to stop operating, however if an ABS fault persists then a TPMS warning or a TPMS system Fault may also be displayed in the instrument cluster.

The system enters 'parking mode' after the vehicle speed has been less than 12.5 mph (20 km/h) for 15 minutes. In parking mode the tire pressure sensors transmit a coded signal to the Tire Pressure Monitoring System Control Module (TPMSCM) once every 13 hours. If the tire pressure decreases by more than 7kPa (1lb PSI; 0.07bar), the sensor will transmit more often indicating tire pressure is being lost.

The process of locating the sensors is known as 'Auto Location' and takes 7 to 8 minutes to complete. During this period the tire sensors transmit at regular intervals, once every 15 seconds. For the remainder of the drive cycle the tire sensors transmit once every 60 seconds or if a change in tire pressure is sensed until the vehicle stops and the system returns to parking mode.

At 25% (or 20% for EU market) deflation the amber warning indicator in the Instrument Cluster (IC) is illuminated and an appropriate message displayed in the message center.