Cadillac 2005 SRX Owner's Manual page 356

TPM Sensor Identification Codes
Each TPM sensor has a unique identification code.
Any time you replace one or more of the TPM sensors,
the identification codes will need to be matched to
the new tire/wheel position. Each tire/wheel position is
matched, to a sensor, by increasing or decreasing
the tire's air pressure. The sensors are matched, to the
tire/wheel positions, in the following order: left front
(LF), right front (RF), right rear (RR), and left rear (LR).
You will have one minute to match the first tire/wheel
position, and five minutes overall, to match all four
tire/wheel positions. If it takes longer than one minute,
to match the first tire and wheel, or more than five
minutes to match all four tire and wheel positions the
matching process stops and you will need to start over.
The TPM matching process is outlined below:
1. Set the Parking brake.
2. Turn the ignition switch to ON with the engine off.
3. Using the Remote Keyless Entry (RKE) transmitter,
lock and unlock the vehicle's doors.
4. Press the lock and unlock buttons, at the same
time, on the RKE transmitter. A single horn chirp
will sound, indicating that the TPM system is ready,
and the sensor matching process can begin.
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5. Start with the left (driver's side) front tire.
6. Remove the valve cap from the valve stem.
Activate the TPM sensor by increasing or
decreasing the tire's air pressure for five seconds,
or until a horn chirp sounds. The horn chirp,
which may take up to 30 seconds, confirms that the
sensor identification code has been matched to
this tire position. To decrease the tire's air-pressure
use the pointy end of the valve cap, a pencil-style
air pressure gage or a key.
7. Proceed to the right (passenger's side) front tire,
and repeat the procedure in Step 6.
8. Proceed to the right (passenger's side) rear tire,
and repeat the procedure in Step 6.
9. Proceed to the left (driver's side) rear tire, and
repeat the procedure in Step 6.
10. After hearing the confirming double horn chirp,
for the left rear tire, exit the matching process
by turning the ignition switch to OFF.
11. Set all four tires to the recommended air pressure
level as indicated on the tire and loading
information label.
12. Put the valve caps back on the valve stems.