The Cadillac CTS tracks real time the pressure in all of your tires. The computer knows what sensor is on what wheel so that it can display to you in the format of LF LR RF RR. This can get thrown off when rotating your tires, so the following process is used to reset the computer to the current location of the sensors.
TPMS Sensor Matching Process
Each TPMS sensor has a unique identiﬁcation code.
Any time you replace one or more of the TPMS sensors
or rotate your vehicle’s tires, the identiﬁcation codes
need to be matched to the new tire/wheel position.
The sensors are matched to the tire/wheel positions in
the following order: driver side front tire, passenger
side front tire, passenger side rear tire, and driver side
rear tire using a TPMS diagnostic tool. See your
dealer/retailer for service.
The TPMS sensors can also be matched to each
tire/wheel position by increasing or decreasing the tire’s
air pressure. If increasing the tire’s air pressure, do
not exceed the maximum inﬂation pressure indicated on
the tire’s sidewall. To decrease the tire’s air-pressure
use the pointed end of the valve cap, a pencil-style
air pressure gage, or a key.
You have two minutes to match the ﬁrst tire/wheel
position, and ﬁve minutes overall, to match all four
tire/wheel positions. If it takes longer than two minutes,
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 need to start over.
The TPMS matching process is outlined below:
1. Set the parking brake.
2. Turn the ignition switch to ON/RUN with the
3. Press the Remote Keyless Entry (RKE) transmitter’s
lock and unlock buttons at the same time for
approximately ﬁve seconds. The horn sounds
twice to signal the receiver is in relearn mode
and Tire Learning Active message displays on the
4. Start with the driver side front tire.
5. Remove the valve cap from the valve stem.
Activate the TPMS sensor by increasing or
decreasing the tire’s air pressure for 10 seconds,
or until a horn chirp sounds. The horn chirp, which
can take up to 30 seconds to sound, conﬁrms
that the TPMS sensor identiﬁcation code has
been matched to this tire position.
6. Proceed to the passenger side front tire, and repeat
the procedure in Step 5.
7. Proceed to the passenger side rear tire, and repeat
the procedure in Step 5.
8. Proceed to the driver side rear tire, and repeat the
procedure in Step 5.
9. After hearing the conﬁrming horn chirp, for the
driver side rear tire, the horn sounds two more
times to signal the tire learning mode is no longer
active. Turn the ignition switch to LOCK/OFF.
10. Set all four tires to the recommended air
pressure level as indicated on the tire and
loading information label.
11. Put the valve caps back on the valve stems.