Tire Pressure Sensor Relearn: Notes

NOTE: Once the learn mode has been enabled, each of the sensor's unique Identification (ID) codes can be learned into the RCDLR's memory. When a sensor's ID has been learned, the RCDLR sends a serial data message to the BCM to sound a horn chirp. This verifies the sensor has transmitted its ID, and the RCDLR has received and learned it.

NOTE: Each sensor takes a pressure measurement sample once every 30 seconds while in stationary mode. If the tire pressure increases or decreases by more than 1.6 psi (11 kPa) from the last pressure measurement, another measurement will occur immediately to verify the change in pressure. If a pressure change has indeed occurred, the sensor transmits in learn mode. When the RCDLR receives a learn mode transmission while in learn mode, it will assign that sensor ID to the location on the vehicle relative to the order in which it was learned. The RCDLR must learn the sensor ID codes in the proper sequence in order to determine sensor location. The first learned ID is assigned to left front, the second to right front, the third to right rear and fourth to left rear.

NOTE: The TPM system will cancel the learn mode if more than 2 minutes have passed and no sensors have been learned, or if the system has been in learn mode for more than 5 minutes. If the learn mode is canceled before any sensor has been learned, the RCDLR will remember all current sensor IDs and their locations. As soon as the first sensor ID code is learned, all other IDs are erased from the RCDLR's memory. The updated tire pressures will not be displayed on the DIC until RCDLR receives 2 more valid transmissions from each sensor. After performing the procedure below, always test drive the vehicle above 25 mph for at least 2 minutes before viewing tire pressures on DIC.

NOTE: In the following procedure, a TPM Sensor Activation Tool (EL-46079 or EL-50448) may be used in place of increasing/decreasing pressures to enable sensor. To use, place activator antenna against the tire sidewall close to the wheel rim at the valve stem location, then press and release the ACTIVATE button.

NOTE: If TPM Sensor Activation Tool (EL-46079 or EL-50448) is used, and vehicle is having trouble entering relearn mode, check batteries in activation tool. Low batteries may allow some functions to work, but not allow vehicle to perform learn function. When the internal battery is fresh (fully charged), the indicator is "full" or is all dark. When the battery is depleted, the indicator shows "empty" or is all light.

There are three ways to enable the learn mode; using a scan tool, using the keyless entry transmitters (if equipped) or using the driver information center (DIC).

After the learn mode has been enabled there are two different methods of activating the transmitters in the tires; utilizing the J-46079 Tire Pressure Monitor Diagnostic Tool at each tire or increase/decrease tire pressure for 8-10 seconds in each tire. If a scan tool has been used to enable the learn mode, the J-46079 must be used to activate the transmitters.

NOTE: Before proceeding with the steps below, ensure that no other sensor learn procedure is being performed simultaneously, or that tire pressures are not being adjusted on a TPM equipped vehicle within close proximity.