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Tire Pressure Indicator Sensor Learn

Special Tools

EL 46079 Tyre Pressure Monitor Diagnostic Tool

Note: When enabling the learn mode the gear lever for automatic transmission must be in park position. With manual gearbox the park brake lever/switch must be in park position.

The Tyre Pressure Monitor system uses

to perform the Tyre Pressure Monitor learn mode functions. The sensor learn procedure must be performed after every tyre rotation, BCM replacement, or sensor replacement. Once the learn mode has been enabled, each of the sensor's unique identification codes can be learned into the BCM memory. When a sensor ID has been learned, the BCM sounds a horn chirp and activates all direction indicators for 3 seconds. This verifies the sensor has transmitted its ID and the BCM has received and learned it. The BCM must learn the sensor IDs in the proper sequence 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. The direction indicators will individually illuminate indicating which location is to be learned in the proper sequence.

Sensor Functions Using EL 46079

Each sensor has an internal low frequency coil. When the EL 46079 tool is used in activate mode, it produces a low frequency transmission that activates the sensor. The sensor responds to a low frequency activation by transmitting in learn mode. When BCM receives a learn mode transmission while in Tyre Pressure Monitor learn mode, it will assign that sensors ID to the location on the vehicle relative to the order in which it was learned.

Sensor Functions Using Pressure Increase/Decrease Method

Each sensor takes a pressure measurement sample once every 30 seconds while in stationary mode. If the tyre pressure increases, or decreases by more than 8.3 kPa (1.2 PSI) from the last pressure transmission, 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 BCM receives a Learn mode transmission while in Tyre Pressure Monitor learn mode, it will assign that sensors 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 cancelled after the first sensor is learned, the following will occur:

These conditions will now require the learn procedure to be repeated for the system to function properly.

Tyre Pressure Monitor Learn Procedure

Note: If using the scan tool to enable the learn mode, the EL 46079 must be used to activate the sensors. When this preferred method is used, any stray sensor signals will not affect the learn procedure. In the event a particular sensor information is displayed on the special tool upon activation but the horn does not 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.

If using the keyless entry transmitter or Driver Information Centre buttons to enable the learn mode, the EL 46079 tool or Pressure Increase/Decrease Method may be used. Before proceeding with this method, ensure that no other learn procedure is being performed simultaneously or that tyre pressures are not being adjusted on another Tyre Pressure Monitor equipped vehicle within close proximity. Stray signals from other Tyre Pressure Monitor equipped vehicles just driving by can be inadvertently learned. If any random horn chirps are heard from the vehicle while performing the learn procedure, most likely a stray sensor has been learned and the procedure will need to be cancelled and repeated. Under these circumstances, performing the Tyre Pressure Monitor Learn Procedure away from other vehicles may be highly recommended. 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.

Preferred Scan Tool Learn Enable Method

1. Using a scan tool, initiate the Tyre Pressure Monitor Learn Mode. A double horn chirp will sound together with activated direction indicators indicating the Learn Mode has been enabled. The left front direction indicator only will then be illuminated.
2. Starting with the left front tyre, activate the sensor by holding the aerial of the aimed upward against the tyre sidewall close to the wheel rim at the valve stem location. Press and release the Activate button and wait for a horn chirp. Once all the direction indicators have been activated for 3 seconds and the horn chirp has sounded, the sensor information is learned and the direction indicator in the next location to be learned will illuminate.
3. After the horn chirp has sounded and the direction indicator in the next location to be learned will illuminate, repeat step 2 for the remaining 3 sensors in the following order:

3.1.	Right front

3.2.	Right rear

3.3.

Left rear

4. When the left rear sensor has been learned, all the direction indicators have been activated for 3 seconds and a double horn chirp has sounded, the learn process is complete and BCM exits the learn mode.
5. Ignition OFF, adjust all tyres to the recommended pressures using a reliable measuring device. Refer to Vehicle Certification, Tyre Placard, Anti-Theft, and Service Parts ID Label .

Alternate Driver Information Centre Learn Enable Method

1. Ignition ON, press and release the Driver Information Centre INFO button on the stalk switch alternatively press the odometer button (depending on Driver Information Centre level) until the TYRE LEARN message appears on the Driver Information Centre display. Press and hold the SET/RESET button until all the direction indicators have been activated for 3 seconds and a double horn chirp sounded indicating the Learn Mode has been enabled. The left front direction indicator will then be illuminated.
2. Starting with the left front tyre, learn the tyre pressure using one of the following methods:

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Hold the aerial of the EL 46079 tool aimed upward against the tyre sidewall close to the wheel rim at the valve stem location. Press and release the activate button and wait for a horn chirp. Once all the direction indicators have been activated for 3 seconds and a single horn chirp sounded, the sensor information is learned and the direction indicator in the next location to be learned will illuminate.

Warning: Over inflating tyres may cause personal injury or damage to the tyres and wheels. When increasing tyre pressure do not exceed the maximum inflation pressure as noted on the tyre sidewall.

•

Increase/decrease the tyre pressure more than 8.3 kPa (1.2 PSI) then wait for a horn chirp. The horn chirp may occur before or up to 30 seconds after the pressure increase/decrease. Once the horn chirp has sounded, the sensor information is learned and the direction indicator in the next location to be learned will illuminate.

3. After the horn chirp has sounded the direction indicator in the next location to be learned will illuminate, repeat step 2 for the remaining 3 sensors in the following order:

3.1.	Right front

3.2.	Right rear

3.3.

Left rear

4. When the left rear sensor has been learned and all the direction indicators have been activated for 3 seconds and a double horn chirp has sounded, the learn process is complete and BCM exits the learn mode.
5. Ignition OFF, adjust all tyres to the recommended pressures using a known accurate hand held tyre pressure gauge. Refer to Vehicle Certification, Tyre Placard, Anti-Theft, and Service Parts ID Label .