Tire Pressure Module: Description and Operation
TIRE PRESSURE MONITORING MODULEDESCRIPTION
The Tire Pressure Monitoring (TPM) system utilizes a control module (1) to control the system. The TPM module (1) is located in the headliner between the dome lamp and the rear view mirror.
OPERATION
The Tire Pressure Monitoring (TPM) module has a microprocessor controller that can monitor the transmissions from the sensor/transmitters anytime the ignition is on. It can store the last 32 transmissions. There are three important values included in these transmissions.
They are:
- Why the transmission was sent,
- Pressure
The module compares the transmitted tire pressure to the two pressure thresholds (low pressure or critical pressure). If the module determines that the tire pressure transmitted is below the low or critical pressure thresholds, it will signal for the "Low Tire" pressure warning lamp to come on.
The TPM module (1) performs diagnostic routines, stores diagnostic trouble codes and provides the appropriate lamp status to the Body Control Module (BCM). When the module determines there is a fault, the low tire pressure indicator lamp circuit is grounded and the BCM turns on the "Low Tire" pressure indicator lamp.
The TPM module (1) also stores its own identification number, each of the four sensor/transmitter identification numbers, module version and the date of manufacture.