OPERATION
The tire pressure monitoring (TPM) module has a
microprocessor controller that can monitor the trans-
missions from the sensor/transmitters anytime the
ignition is on. It will store the last 32 transmissions;
however, they cannot be observed as they occur using
a DRBIIIt. There are three important values
included in these transmissions. They are:
• Why the transmission was sent,
• From which sensor it came (LF, RF, LR, RR),
and
• Pressure
The module compares the transmitted tire pressure
to the two pressure thresholds (low pressure or crit-
ical pressure). If the module determines that the tire
pressure transmitted is below the low or critical pres-
sure thresholds, it will signal for the “LO TIRE”
pressure warning lamp to come on.
The TPM module performs diagnostic routines,
stores diagnostic trouble codes and provides the
appropriate indicator status to the body control mod-
ule (BCM). When the module determines there is a
fault, the BCM will send a message to the cluster to
turn on the 9LO TIRE9 message in the odometer.
The TPM module also stores its own identification
number, each of the four sensor/transmitter identifi-
cation numbers, module version and the date of man-
ufacture.
STANDARD PROCEDURE - TPM MODULE
PROGRAMMING
If a TPM module fails, or one or more tire pressure
sensor/transmitters fail, after replacement, the TPM
module’s diagnostic memory must be cleared and
reprogrammed. This is necessary for the module to
detect which wheel is sending the signal.
Refer to the following procedure to program the
module for identification of one new or all tire pres-
sure sensor/transmitters.
NOTE: The vehicle’s tires must not have been
rotated above 8 km/h (5 mph) in the last two min-
utes prior to programming.
(1) Connect a DRBIIIt scan tool to the vehicle’s
diagnostic connector beneath the instrument panel,
to the right of the steering column.
(2) Access the Chassis System using the DRBIII.
(3) Once in the Chassis System, select Tire Pres-
sure Monitor, followed by Miscellaneous.
(4) Select the appropriate function from the next
screen displaying the following options:
• Program LF Pressure Sensor
• Program RF Pressure Sensor
• Program RR Pressure Sensor
• Program LR Pressure Sensor
• Program Module (4 Sensors)
• Monitor
(5) Place a magnet, special tool 8821, at the valve
stem for that wheel as directed by the DRBIII. If the
Program Module function has been chosen, the
DRBIII will direct you to the left front wheel pres-
sure sensor/transmitter first.
(6) When that wheels pressure sensor/transmitter
has been programmed, the DRBIII will display Pro-
gram Transmitter Complete or will automatically
direct you to the next wheel sensor/transmitter to be
programmed.
NOTE: When programming the module (all four sen-
sor/transmitters), the magnet should be moved from
wheel to wheel in a clockwise direction starting at
the left front wheel.
(7) Remove the magnet and if programming the
entire module, move the magnet to each of the
remaining wheels as directed by the DRBIII. Each
sensor/transmitter will automatically sense the pres-
ence of the magnet and begin programming.
(8) Once Program Transmitter Complete is dis-
played, exit the program function screen.
(9) Verify that the module programming is com-
plete by looking at the tire pressure sensor/transmit-
ter ID’s in the Sensor Display using the DRBIII.
REMOVAL
(1) Disconnect the battery negative terminal.
(2) Access and remove the instrument cluster
gauge pack (Fig. 13). (Refer to 8 - ELECTRICAL/IN-
STRUMENT CLUSTER/GAUGES - REMOVAL)
(3) Disconnect the wiring harness from the TPM
module.
(4) Remove the two mounting screws.
(5) Remove the TPM module.
INSTALLATION
(1) Place TPM module on instrument panel. Align
the mounting holes.
(2) Install the mounting screws.
(3) Connect the wiring harness connector to the
TPM module.
(4) Install the instrument cluster gauge pack and
all components removed to access it. (Refer to 8 -
ELECTRICAL/INSTRUMENT CLUSTER/GAUGES -
INSTALLATION)
(5) Program the identification code from each tire
pressure transmitter into the new TPM module.
(Refer to 22 - TIRES/WHEELS/TIRE PRESSURE
MONITORING/MODULE - STANDARD PROCE-
DURE)
22 - 8 TIRES/WHEELS ZB
MODULE - TPM (Continued)
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