Roll Switch
There is an integral roll switch within the Tire Pressure/Sensor Transmitter that must be closed before the transmitter is enabled. This roll switch is open when the vehicle is stopped or below 33 km/h (20 mph.) When the vehicle is moving above 33 km/h (20 mph) centrifugal force will close the roll switch.
NOTE:
The transmitter will continue to transmit for 15 minutes and once an hour after the roll switch has opened. If a transmitter is tested with Miller tool 9001, and it is determined that a RF signal is present, the vehicle must driven to verify roll switch closure.