The sensors transmit radio frequency signals to the smart junction box (SJB), or BCM in later models, approximately every 60 seconds when the vehicle speed exceeds 20 mph (32 km/h).
Each tire pressure sensor transmission is compared against a low-pressure limit (the pressure listed on the vehicle certification label minus 25%, which will be about 6 to 9 psi).
If it is determined that the tire pressure has fallen below this limit, the SJB sends a message to the instrument cluster, which then illuminates the low pressure warning indicator and displays the appropriate message(s) in the message center (if equipped).
All tire pressure sensors are battery operated. The sensors are attached to the portion of the valve stem located inside the wheel with a T10 Torx screw. Under the following conditions, the TPMS may not function properly:
• Low tire pressure.
• Tire pressure sensor is missing or damaged.
• Spare tire is installed as a road wheel.
• Incorrect tire pressure sensor is installed.
• Tire pressure sensor installed incorrectly.
• Non-OEM wheels installed (aftermarket rims).
• Non-OEM equipped run-flat tires installed.
• Other non-OEM modifications (roll cages, service barriers, part racks, ladder racks, etc.)
TIRE PRESSURE MONITOR WARNING INDICATORS
NOTE: As ambient temperature decreases by 6 degrees Celsius (10 degrees Fahrenheit),
tire pressure decreases 1 psi (7 kPa). Because tire pressures fluctuate with temperature changes, tire pressures must be set when the tires are at outdoor ambient temperatures.
If not the tire pressure may drop enough to be detected by the TPMS, which will activate the low pressure warning light.
When the tire pressure warning light comes on solid and the message center displays “LOW TIRE PRESSURE,” check the air pressure of all tires and adjust to the specified cold pressure listed on the vehicle certification label (found on the driver’s door or door pillar). Drive the vehicle at 20 mph (32 km/h) for at least two minutes. If the vehicle has been stationary for more than 30 minutes, the sensor will enter into a “sleep mode” and stop transmitting. A TPMS sensor activation procedure may be needed. Make sure the warning light goes off. If the warning light stays on, there is a malfunction in the TPMS. See the appropriate manufacturer service information.
When the tire pressure warning light flashes for 70 seconds and then remains illuminated, after a bulb-check has been performed and the message center displays warning messages, there is a malfunction in the TPMS. See the appropriate manufacturer service information.
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