The TPMS monitors tire pressure and sends a signal to the Cadillac's computer when there is low tire pressure. When the tire pressure is restored, the Cadillac's TPMS should reset itself. However, if it does not, the TPMS light on the dash will stay lit. When this happens, you need to know how to manually reset the TPMS light and sensors.
Instructions
1 Press and hold the tip odometer button on the gauge cluster.
2 Wait until the display screen brings up the settings menu.
3 Release the "reset" button and press it again to scroll through various settings.
4 Keep pressing the "reset" button until you come to the TPMS setting.
5 Press and hold the "reset" button until the TPMS light on the dash resets.
SOURCE: tire pressure sensor continues to say check tire
The TPMS sensors are located inside the tire/rim assembly, and can not be cleaned. It must be replaced by a qualified service technician.
Keep in mind that inflation additives may damage TPMS sensors, things such as Fix A Flat and Slime Tire Sealant.
If all your tires are inflated to manufacturer's recommended tire pressures or higher, you will need to have one or more sensors replaced.
SOURCE: replacement sequence for serpentine belt for a 96 cadillac devill
Assuming you have the Northstar engine
SOURCE: 2003 Cadillac seville sts TPMS reset
From 2005 STS Owners manual:
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/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. Press the push-button ignition switch to OFF/ACC.
3. Using the Keyless Access transmitter, lock and
unlock the vehicle’s doors.
4. Press the lock and unlock buttons, at the same
time, on the Keyless Access transmitter. A single
horn chirp will sound, indicating that the TPM
system is ready, and the sensor matching process
can begin.
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/ACC.
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.
SOURCE: 2002 Escclade and that display reads "service tire monitor"
You can see if the dealer can turn the tire monitor system off, but that would be your only hope, or ignore it like everyone else does.
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Unless your DIY tools include a shop with lift, a tire-changer machine, and a tire-balancing machine, better hope verifying all tires are same pressure (within the value on the car's sticker) then following Sudeep's instructions work. Otherwise it's off to a local tire store to get the offending tire(s) demounted so they can replace the TPM sensor(s). The Deville will tell you which sensor is reporting an out-of-spec condition like this: 22 PSI LF TIRE LOW (which means the left-front tire TPM sensor thinks the tire press is low (22 PSI). If you _know_ the tire press is right, then that sensor is defective. And the tire has to come off to replace it. And then re-mounted and balanced.
P.S. You can also use the Driver Information Center (DIC) to look at the pressure being reported by all four sensors any time. Check out page 3-62 of your 2004 Deville Owners Manual.
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