Tire Pressure Monitor Module: Transmitter

The measured tire pressure value is transmitted when the vehicle speed is above 33 km/h (20 mph), every 60-68 seconds or if the pressure drops 6.9 kpa (1 psi) or more between sampling periods. It is important to note that not all the tire pressure sensor/transmitters will start to transmit at the same time. Due to manufacturing tolerances some transmitters may start to operate with speeds as low as 16 Km/h (10 mph.)

The TPM module continuously monitors and records the last 32 transmissions that it receives. When the TPM module notices that one of the Tire Pressure Sensor/Transmitters has not sent its information within the last 32 transmissions, it will set a Diagnostic Trouble Code (DTC) and request the "Lo Tire" LCD message on. If the transmitter begins transmitting again, the module will shut off the "Lo Tire" LCD message, however, the transmitter ID and number of occurrences are stored. This data is in the TPM module memory and can be erased using the DRBIII®. If this type of failure occurred, the BCM DTC will have to be cleared as well.