Lo Tire LCD Message and Warning Alert

The "Lo Tire" LCD message is located in the Instrument Cluster. The message is used to inform the driver that one or more of the tires have low air pressure. The TPM module indirectly through the BCM controls the "Lo Tire" message. The BCM controls the "Lo Tire" LCD message by communicating with the Instrument Cluster via the PCI Bus. The Instrument Cluster controls the "Lo Tire" LCD message as well as providing a warning alert signal to the BCM. When the ignition is first turned on, the TPM module grounds the Low Tire Pressure Signal circuit for 2 seconds. The "Lo Tire" LCD message will be on for 2 seconds signifying that the system is operational. If the BCM did not sense that the TPM module has provided a ground path after initial ignition on, and/or the TPM module has set a DTC and is keeping the Low Tire Pressure Signal circuit grounded, the BCM will set a DTC ten seconds after the transition to run. The BCM will turn the "Lo Tire" LCD message on, signifying a problem with the TPM system.