TPM Learn Mode Description: Notes

The tire pressure monitor (TPM) system uses the liftgate module (LGM), body control module (BCM), exterior lamp switch, 4 RF transmitting pressure sensors, and the serial data circuit to perform the TPM learn mode functions. The sensor learn procedure must be performed after every tire rotation, LGM replacement, or sensor replacement. Once the TPM learn mode has been enabled, each of the sensor's unique identification (ID) codes can be learned in to the LGM memory. When a sensor's ID has been learned, the LGM sends a serial data message to the BCM to sound a horn chirp. This verifies the sensor has transmitted its ID and the LGM has received and learned it. The LGM must learn the sensor IDs in the proper order to determine correct sensor location. The first learned ID is assigned to the left front location, the second to right front, the third to right rear, and the fourth to left rear.