Service Manual Tire Pressure Sensor Learn

Tire Pressure Indicator Sensor Learn

Special Tools
* EL-46079 - Tire Pressure Monitor Diagnostic Tool
* EL-50448 - Tire Pressure Monitor Sensor Activation Tool

For equivalent regional tools, refer to Special Tools Tools and Equipment.

TPM Learn Mode Description

The tire pressure monitor (TPM) system uses the 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, BCM replacement, or sensor replacement. Once the TPM learn mode has been enabled, each of the sensor unique identification (ID) codes can be learned in to the BCM memory. When a sensor ID has been learned, the BCM sounds a horn chirp. This verifies the sensor has transmitted it ID and the BCM has received and learned it. The BCM must learn the sensor IDs in the proper order to determine correct sensor location. The first learned ID is assigned to the left front, the second to right front, the third to right rear and the fourth to left rear.

Sensor Functions Using EL-46079, EL-50448, or Equivalent

Each sensor has an internal low frequency (LF) coil. When the TPM special tool is used in activate mode it produces an LF transmission that activates the sensor. The sensor responds to a LF activation by transmitting in learn mode. When the BCM receives a learn mode transmission while in TPM learn mode, it will assign that sensor ID to the location on the vehicle relative to the order in which it was learned.

Learn Mode Cancellation

The learn mode will cancel if the ignition is cycled to OFF or if more than 2 minutes has elapsed for any sensor that has not been learned. If the learn mode is cancelled before the first sensor is learned, the original sensor IDs will be maintained. If the learn mode is canceled for any reason after the first sensor is learned, all IDs except for the ID's just learned are erased from the BCM memory and if equipped, the DIC will display a service tire monitor type message.
TPM Learn Procedure

Note: If the learn mode activation is unsuccessful, ensure that the Park Brake and Headlamp Switch input parameters are functioning correctly. In the event a particular sensor activation does not cause the horn to chirp, it may be necessary to rotate the wheel valve stem to a different position due to the sensor signal is being blocked by another component.

1. Ignition ON.
2. Apply the parking brake.
3. Turn the headlamp lamp switch from OFF to PARK 4 times within 4 seconds. A double horn chirp will sound and the low tire pressure indicator will begin to flash indicating the learn mode has been enabled.
4. Starting with the left front tire, hold the antenna of the TPM special tool against the tire sidewall close to the wheel rim at the valve stem location then press and release the activate button and wait for a horn chirp.
5. After the horn chirp has sounded, repeat step 4 for the remaining 3 sensors in the following order:

1. Right front
2. Right rear
3. Left rear

6. After the LR sensor has been learned, a horn chirp will sound indicating all sensors have been learned.
7. Turn OFF the ignition to exit the learn mode.