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‌TIRE PRESSURE MONITOR SYSTEMS

GM - Chevrolet - Volt - 2011-18

DESCRIPTION & OPERATION

NOTE: If a tire pressure sensor or the RCDLR is replaced, or if wheels have been rotated, tire pressure sensor must be relearned. See RESET PROCEDURES.

TIRE PRESSURE MONITOR (TPM) SYSTEM

The tire pressure monitor system uses the instrument cluster, body control module (BCM), 4?radio frequency transmitting pressure sensors, and the serial data circuit to perform the tire pressure monitor learn mode functions. The sensor Learn procedure must be performed after every tire rotation, BCM replacement, or sensor replacement. Once the Learn mode has been enabled, each of the sensors unique identification codes can be learned into the BCM memory. When a sensor ID has been learned, the BCM sounds a horn chirp indicating the sensor has transmitted its ID and the BCM has received and learned it. The BCM must learn the sensor ID's 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 turn signals will individually illuminate indicating which location is to be learned in the proper sequence.

Each sensor has an internal low frequency coil. When the tire pressure monitor special tools are 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-Remotely Triggered. When the BCM receives a Learn Mode-Remotely Triggered transmission while in tire 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.

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 after the first sensor is learned, the following will occur:

All stored sensor IDs will be invalidated in the RCDLR memory. If equipped, the DIC will display dashes instead of tire pressures. DTC C0775 will be set.

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

TIRE PRESSURE MONITOR WARNING INDICATORS

When the TPM system detects a significant loss of tire pressure, the "CHECK TIRE PRESSURE" message is displayed on the DIC and the low tire pressure indicator is displayed on the instrument panel. Both the message and indicator can be cleared by adjusting the tires to their recommended pressures and driving the vehicle above 25 mph (40 km/h) for at least 2 minutes.

The RCDLR has the ability to detect malfunctions within the TPM system. Any malfunctions detected will cause the DIC to display a "SERVICE TIRE MONITOR" warning message. If warning indicators are still on or display shows dashes instead of a value after a completed Relearn procedure, there is a problem in the TPM system. See appropriate manufacturer service information.

TPMS RESET PROCEDURES

NOTE: If a tire pressure sensor or the RCDLR is replaced, or if wheels have been rotated, tire pressure sensor must be relearned.

When the TPM system detects a significant loss of tire pressure, the "CHECK TIRE PRESSURE" message is displayed on the DIC and the low tire pressure indicator is displayed on the instrument panel. Both the message and indicator can be cleared by adjusting the tires to their recommended pressures and driving the vehicle above 25 mph (40 km/h) for at least 2 minutes.

TIRE PRESSURE SENSOR LEARN

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. 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.

NOTE: In the following procedures, a TPM Special 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 Special 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 all dark. When the battery is depleted, the indicator shows "empty" or all light. The placement of the TPM Sensor Activation Tool (J-46079) is critical. If the scan tool antenna is not placed perpendicular to the wheel wall and close to tire pressure valve stem, it may not properly activate the tire pressure sensor.

NOTE: The TPM Special Tool (EL-46079 or EL-50448) can be used during the learn procedure. Press and release the "ACTIVATE" key button 1 second, this is will activate the activation cycle. The Activation cycle will force the tire pressure sensor to transmit their IDs.

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

In the event that a particular sensor's information is displayed on the special tool upon IMPORTANT: 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.

1. Ignition ON, initiate the TPM Learn Mode using one of the following procedures:

Using a scan tool, initiate the TPM Learn Mode. A double horn chirp will sound indicating the Learn Mode has been enabled. The left front turn signal will also be illuminated.

Using the Driver Information Center (DIC):

2011-15 :

a. Set the parking brake.

b. Put the vehicle in ON/RUN and place the vehicle in P (Park).

c. If the DIC display is minimized, press the SELECT knob to maximize it. See Fig. 1.

d. Use the SELECT knob to scroll to the Tire Pressure display screen.

e. Press and hold the SELECT knob for five seconds to begin the sensor matching process. A message displays confirming to begin the process.

f. Use the SELECT knob to select YES with the highlighted selection, and press the SELECT knob again to confirm the selection. The horn sounds twice to signal the receiver is in relearn mode and the TIRE LEARNING ACTIVE message displays on the DIC screen.

g. Proceed to next step.

2016- :

a. Set the parking brake.

b. Place the vehicle in ON/RUN.

c. Make sure the Tire Pressure info page option is turned on. The info pages on the DIC can be turned on and off through the Settings menu.

d. Use the DIC controls on the right side of the steering wheel to scroll to the Tire Pressure screen under the DIC info page. See Fig. 2.

e. Press and hold the Check Mark (Set/ Reset) button located in the center of the DIC controls. The horn sounds twice to signal the receiver is in relearn mode and the TIRE LEARNING ACTIVE message displays on the DIC screen.

f. Proceed to next step.

2. Starting with the left front tire, active the sensor by holding the antenna of the TPM Sensor Activation Tool aimed upward against the tire sidewall close to the wheel rim at the valve stem location. Press and release the Activate button. Ensure that the transmit indicator on the special tool indicates that the sensor activation signal is being transmitted. Wait for a horn chirp. If the horn does not chirp, repeat the sensor activation sequence with the tool. Once the horn chirp has sounded, the sensor information is learned and the turn signal in the next location to be learned will illuminate.

3. After the horn chirp has sounded and the right front turn signal is illuminated, repeat procedure for the remaining 3 sensors in the following order: Right Front, Right Rear, Left Rear.

4. When the left rear sensor has been learned and a double horn chirp has sounded, the learn process is complete and the RCDLR exits the learn mode.

Fig. 1: Identifying Driver Information Center (DIC) Controls (2011-15) Courtesy of GENERAL MOTORS CORP.

Fig. 2: Identifying Driver Information Center (DIC) Controls (2016-) Courtesy of GENERAL MOTORS CORP.

DISMOUNTING/MOUNTING PROCEDURES

CAUTION: The tire should be dismounted from the wheel using the tire changer manufacturer's instructions. Use the following information to avoid damage during the dismounting/mounting procedures.

NOTE: If vehicle's tires are replaced with those not having a TPC Spec number, the TPM system may give an inaccurate low pressure warning. Non-TPC Spec tires may give a low pressure warning that is higher or lower than the proper warning level achieved by TPC Spec numbered tires.

NOTE: If a tire pressure sensor or the RCDLR is replaced, or if wheels have been rotated, tire pressure sensor must be relearned. See RESET PROCEDURES.

TIRE PRESSURE SENSOR

CAUTION: DO NOT inject any tire liquid or aerosol tire sealant into tires, as this may cause a malfunction of the tire pressure sensors. If any tire sealant is noted upon tire dismounting, replace the sensor. Also remove all residual liquid sealant from

the inside of the tire and wheel surfaces.

Removal

1. Raise vehicle on a suitable support. Remove tire/wheel assembly from vehicle.

2. Dismount tire from wheel following tire changer manufacturer's instructions while paying special attention to the following to avoid damaging tire pressure sensor:

Place the sensor's cap and valve on a dry, clean surface after removal. The cap is aluminum and the valve is nickel-plated to prevent corrosion. DO NOT substitute a cap or valve made of any other material.

Position the bead breaking fixture 90 degrees from valve stem when separating tire bead from wheel.

Position the mounting/dismounting head so tire iron (or pry bar) can be inserted slightly clockwise of sensor body when prying tire bead up and over the mounting/dismounting head.

Using tire machine, rotate tire/wheel assembly clockwise when transferring the tire bead to the outside of the wheel rim.

Repeat items for inner bead.

3. Remove the TORX screw (3) from the tire pressure sensor (2) and pull it straight off the tire pressure valve stem (1). See Fig. 3.

4. Remove the tire pressure valve stem by pulling it through the rim.

5. Follow Installation below, to replace the sensor.

Fig. 3: Exploded View Of Tire Pressure Sensor Courtesy of GENERAL MOTORS CORP.

Installation

1. Assemble the tire pressure sensor (2) to the valve stem and install the new TORX screw (3). See Fig. 3.

2. Apply tire soap to the rubber portion of the valve stem.

3. Using a tire valve stem mounting tool, pull the valve stem through in a direction parallel to the valve hole on the rim. See Fig. 4.

4. Before installing 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 valve stem.

Position the bead transition area 45 degrees counterclockwise of valve stem.

Using tire machine, rotate tire/wheel assembly clockwise when transferring tire bead to the inside of the wheel rim.

Repeat items for outer bead.

5. Install tire on wheel. Install tire/wheel assembly on vehicle. Retrain tire pressure sensor. See RESET PROCEDURES.

NOTE: TPM sensors are still shipped in the OFF mode. However, the TPM sensor no

Fig. 4: Installation Of Sensor/Valve Assembly Courtesy of GENERAL MOTORS CORP.

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

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