Originally Posted by BlueStorm
the dealer ship told me there are no batteries in the TPMS...who knows the truth?
I suppose either one of two things happened.
1. you can't read / just plain old ignored the post I made.
or
2. You for some reason don't believe me, with which case I suppose quoting out of the service manual is still a total waste of my time, but I'll do it anyhow.
Originally Posted by Crossfire Service Manual
OPERATION
Each tire pressure sensor/transmitter serves three functions:
˛
It is used as a valve stem to inflate and deflate the tire.
˛
It periodically measures tire pressure. (Approximately every 30 seconds.)
˛
It transmits the tire pressure value to the low tire pressure warning module in the vehicle. (Approximately
every 60 seconds or if tire pressure changes by one psi or more between transmissions.)
The system operates by monitoring a radio frequency transmission from the sensor/transmitters located in each
wheel. When the vehicle reaches a speed of approximately 32 km/h (20 mph), centrifugal force created by the rotating
wheels closes a roll switch inside each sensor/transmitter, powering up the circuitry.
The sensor/transmitters will only send out information when vehicle speed is above 32 km/h (20 mph). To facilitate
transmitting the radio signal to the TPM module, the valve stem acts as the antenna for the tire pressure sensor/
transmitter. When the TPM module senses that pressure is below one of two calibrated thresholds, (low pressure or
critical pressure) the TPM system will set a diagnostic trouble code and indirectly operate the “Low Tire” pressure
indicator lamp and the chime tone through the body control module (BCM).
The tire pressure sensor/transmitter is powered by an internal battery. The battery is not replaceable separately. In
the event of battery failure, the entire tire pressure sensor/transmitter at that wheel will require replacement. To
extend the life of the battery, the sensor/transmitter is not activated until the vehicle reaches a speed of approximately
32 km/h (20 mph) as stated earlier.
Each tire pressure sensor/transmitter has a unique identity code. This will allow the TPM system to indicate to a
technician, through diagnostic trouble codes in the module, which tire of the vehicle has lost air pressure. This code
is also used to identify to a technician which pressure sensor/transmitter has set a diagnostic trouble code. For this
reason, if a tire pressure sensor/transmitter needs to be replaced, the new sensor/transmitter must be programmed
to have its identity code recognized by the receiver.