The Tire Pressure Monitor (TPM) system warns the driver when a significant loss, or gain of tire pressure occurs in any of the 4 tires and allows the driver to display the individual tire pressures and their locations on the Driver Information Center (DIC).
The system uses the Instrument Panel Cluster (IPC), DIC, Body Control Module (BCM), a Radio Frequency (RF) transmitting pressure sensor in each wheel/tire assembly, and the serial data circuit to perform the system functions. Each sensor has an internal power supply with a 10 year service life.
When the vehicle is stationary, the sensors internal accelerometer is inactive, which puts the sensors into a stationary state. In this state the sensors sample tire pressure once every 30 seconds and do not transmit at all if the tire pressure does not change. As vehicle speed increases, centrifugal force activates the sensors internal accelerometer causing the sensors to go into rolling mode. In this mode, the sensors sample tire pressure once every 30 seconds and transmit in rolling mode once every 60 seconds. The BCM receives and translates the data contained in each sensors RF transmission into sensor presence, sensor mode, and tire pressure. The BCM sends the tire pressure and tire location data to the DIC via the serial data circuit.
The sensors continuously compare their last pressure sample to their current pressure sample and will transmit in re-measure mode if a 1.2 psi (8.3 kPa) change in tire pressure has been detected in either a stationary or rolling state. When the TPM system detects a significant loss, or gain of tire pressure, the tire pressure monitor indicator icon is illuminated on the IPC and if equipped, a check tire pressure type message is displayed on the DIC. Both the indicator icon and DIC message can be cleared by adjusting the tire pressures to the recommended psi/kPa and driving the vehicle above 25 mph (40 km/h) for at least 2 minutes.
The BCM has the ability to detect malfunctions within the TPM system. In the event a DTC is set, the tire pressure monitor indicator icon on the IPC will flash for 1 minute and then remain illuminated after the ignition is turned ON and the IPC bulb check has been completed. Any malfunction detected will cause the DIC to display a service tire monitor system type message.Learn Mode Cancellation
Hummer H3 2006-2010
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.Sensor Functions Using J-46079
Hummer H3 2006-2010
Each sensor has an internal Low Frequency (LF) coil. When the J-46079 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.Sensor Functions Using Pressure Increase/Decrease Method
Hummer H3 2006-2010
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 1.2 psi (8.3 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 re-measure mode. When the BCM receives a re-measure 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.TPM Learn Mode Description
Hummer H3 2006-2010
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.TPM Learn Procedure
Hummer H3 2006-2010
Before proceeding with the steps below, verify the following:
- No other sensor learn procedure is being performed simultaneously within close proximity.
- Tire pressures are not being adjusted on another TPM equipped vehicle within close proximity.
- Park Brake and Headlamp Switch input parameters are functioning correctly.
- Turn ON the ignition, with the engine OFF.
- Apply the parking brake.
- Turn the exterior lamp switch from OFF to parking lamps 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.
Starting with the left front tire, learn the tire pressure using one of the following methods:
Hold the antenna of the J-46079 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.
CAUTIONOver inflating tires may cause personal injury or damage to the tires and wheels. When increasing tire pressure do not exceed the maximum inflation pressure as noted on the tire sidewall.
- Increase/decrease the tire pressure for 8-10 seconds then wait for a horn chirp. The horn chirp may occur before or up to 30 seconds after the 8-10 second pressure increase/decrease time period has been reached.
- Hold the antenna of the J-46079 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.
After the horn chirp has sounded, repeat step 4 for the remaining 3 sensors in the following order:
- After the LR sensor has been learned, a horn chirp will sound indicating all sensors have been learned.
- Turn OFF the ignition to exit the learn mode.
- After the learn mode has been exited, adjust all tires to the recommended pressures and road test the vehicle.
Removal & Installation
- Raise the vehicle on a suitable support.
Remove the tire/wheel assembly from the vehicle.
NOTEBefore the tire is removed from the wheel, note the following items to avoid tire pressure sensor damage upon tire dismounting:
- Place the sensors cap and valve on a dry clean surface after removal. The cap is aluminum and the valve is nickel plated to prevent corrosion and are not to be substituted with a cap or valve made of any other material.
- When separating the tire bead from the wheel, position the bead breaking fixture 90 degrees from the valve stem.
- Position the mounting/dismounting head so the tire iron, or pry bar can be inserted slightly clockwise of the sensor body when prying the tire bead up and over the mounting/dismounting head.
- Using the tire machine, rotate the tire/wheel assembly clockwise when transferring the tire bead to the outside of the wheel rim.
- Repeat items for inner bead.
Remove the tire from the wheel.
NOTEIf any tire sealant is noted upon tire dismounting, remove all residual liquid sealant from the inside of the tire and wheel surfaces.
- Remove the tire pressure sensor nut.
- Remove the tire pressure sensor.
- Clean any dirt or debris from the grommet sealing area.
- Insert the sensor in the wheel hole with the air passage facing away from the wheel.
Install the sensor nut and position the sensor body parallel to the inside wheel surface while torquing.
NOTEBefore reinstalling the tire on the wheel, note the following items to avoid tire pressure sensor damage upon tire mounting:
- Position the mounting/dismounting head 180 degrees from the valve stem.
- Position the bead transition area 45 degrees counterclockwise of the valve stem.
- Using the tire machine, rotate the tire/wheel assembly clockwise when transferring the tire bead to the inside of the wheel rim.
- Repeat items for outer bead.
Install the tire on the wheel.
NOTEA service replacement tire pressure sensor is shipped in OFF mode. In this mode the sensor unique identification code cannot be learned into the Remote Control Door Lock Receiver (RCDLR) memory. The sensor must be taken out of OFF mode by spinning the tire/wheel assembly above 20 mph (32 km/h) in order to close the sensors internal roll switch for at least 10 seconds.
- Install the tire/wheel assembly on the vehicle.
- Lower the vehicle.
- Learn the tire pressure sensors.