Check tire pressure light is on. Will this reset

use this link.
http://enginepartsdiagram.com/2007-2016-ford-focus-tire-pressure-tpms-sensor-light-reset/

My Lesabre has buttons on the left side of the dash. The one called Gage Info has a number of things like oil pressure check tire pressure heat Battery. Push this button till it says check tire pressure To reset your light push the reset button and hold for fifteen or twenty second and the light on the dash should go out and it will show tire pressure ok on the gage. Before you reset check all four tires for air as one tire could be down 8 or 10 lbs and the light will come back on. they all have to be the same pressure.
When you change your oil you should reset the oil section as well and hold reset the same as above. The oil section tells you how much oil you use over an amount of time.

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.

SWITCH IGNITION ON, REPEATEDLY PRESS GAGE INFO BUTTON UNTIL THE MESSAGE TIRE PRESSURE IS DISPLAYED IN THE MULTIFUNCTION DISPLAY, PRESS AND HOLD RESET BUTTON UNTIL THE MESSAGE TIRE PRESSURE RESET IS IN THE DISPLAYED IN THE MULTIFUNCTION DISPLAY,RELEASE THE RESET BUTTON THE MESSAGE TIRE PRESSURE NORMAL WILL BE DISPLAYED IN THE MULTIFUNCTION DISPLAY, AFTER RESETTING TPMS THE VECHICLE REQUIRE UP TO 30 MINUTES OF STRAIGHT LINE SMOOTH ROAD DRIVING IN EACH OF THE 3 SPEED RANGES 15 - 40 MPH - 40 - 70 MPH - 70 - 90 MPH. MAKE SURE ALL 4 TIRES HAS THE RIGHT AIR PRESSURE BEFORE RESETTING TIRE PRESSURE LIGHT.OR LIGHT WILL NOT TURN OFF IF ONE TIRE IS LOW.

Did you check the spare tire too?

You shouldn't be setting the tire pressure to the max inflation pressure listed on the sidewall, that will likely result in uneven tire wear with the center of the tire wearing out prematurely. You should set the pressures according to the listings in the door jam. Most likely 32-34psi. Also, have you checked the spare tire? Some systems monitor and will illuminate the TPMS light if the spare tire pressure isn't within an acceptable range. The spare is often overlooked when checking tire pressures because of a TPMS indicator.

To reset the tire pressure light you need to get the tool.

You can get the tool here on link below.

http://cgi.ebay.com/ebaymotors/FORD-OEM-TIRE-PRESSURE-MONITOR-RESET-TOOL-TPMS-RESET_W0QQcmdZViewItemQQhashZitem45eed5e149QQitemZ300359737673QQptZMotorsQ5fAutomotiveQ5fTools

Your tire pressure monitor needs to be reset whenever you change or rotate your tires...

1. check and make sure that your tires are inflated to the correct pressure

2. turn the ignition switch to the ON position. If the low tire pressure warning light comes on, push and hold the tire pressure warning reset switch (think the switch is in the glovebox, but not sure) until the warning light turns off and then release the switch.

3. now press and hold the tire pressure warning reset switch until the low tire pressure warning light blinks three times.

4. initialization is *not* completed until driving at the vehicle speed of 19 mph or over for more than one hour. the tire pressure monitoring starts when initialization is completed.

Because of changing outside temps this happens, just hold reset button on left side of dash until it reads tire pressure 100% again, just make sure your pressure is right before you do it. this is the same for oil changes and the like.

I believe this is for your tire pressure sensors. If the tire pressure in one of your tires drops it will alert you with a light on your dash. When tire pressure is restored, press this button to reset the sensor.