Tire Pressure Sensor Relearn: Notes

NOTE: On some STS models, the front and rear tires are different sizes, and tire rotation is not recommended. Follow vehicle manufacturer's recommended procedures.

IMPORTANT: If using the pressure increase/decrease method, the following procedure must be completed within 15 minutes from when the vehicle is stationary after being driven at 20 mph (32 km/h), or greater, for 10 seconds.

IMPORTANT: Before proceeding with the steps below, ensure that no other learn procedure is being performed simultaneously, or that no tire pressures are being adjusted on another TPM equipped vehicle within close proximity.

The TPM system uses the Instrument Panel Module (IPM), RCDLR, keyless entry transmitter, 4 Radio Frequency (RF) transmitting pressure sensors, and the serial data circuit to perform the sensor learn mode functions. The sensor learn procedure must be performed any time the RCDLR is replaced, a sensor is replaced, or after every tire rotation. 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 IPM to sound a horn chirp. This verifies the sensor has transmitted its ID and the RCDLR has received and learned it. The RCDLR must learn the sensor IDs in the proper order to determine correct sensor location. The first learned ID is assigned to left front, the second to right front, third to right rear and forth to left rear.

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 a re-measure mode transmission. When the RCDLR receives a re-measure mode transmission while in sensor learn mode, it will assign that sensor's ID to the location on the vehicle relative to the order in which it was learned.

The TPM system will cancel the learn mode if more then 2 minutes have passed and no sensors have been learned, or if the RCDLR has been in learn mode for more than 5 minutes. If the learn mode is canceled before any IDs are learned, the RCDLR will remember all previously stored IDs and their locations. As soon as the first sensor ID is learned, all other IDs are erased from the RCDLR's memory.

NOTE: Before proceeding with the steps below, ensure that no other sensor learn procedure is being performed simultaneously, or that no tire pressures are being adjusted on another TPM equipped vehicle within close proximity.

NOTE: In the following procedures, a TPM Sensor Activation Tool (J-46079) 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 (J-46079) 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 all dark. When the battery is depleted, the indicator shows "empty" or all light.

NOTE: If increasing/decreasing pressure method is used to enable sensor, the relearn procedure must be completed within 15 minutes from when the vehicle is stationary after being driven at 20 mph (32 km/h), or greater, for 10 seconds.