HOW TO RESET THE LOW TIRE LIGHT ON 2012 GRAND CARAVAN

Diane, it is sensing low air pressure in one of the tires, or faulty sensor. check air pressure in tire and fill to specification.
Check the attached links for more info,
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Why Is My TPMS Light Flashing It Could Be Time for New Sensor Kal Tire

Dodge Chrysler Jeep Fiat TPMS Tire Pressure Monitoring System Relearn...

http://forum.chryslerminivan.net/showthread.php/15281-Tire-Inflate-Light-Comes-on

Tire Pressure Warning Light

Once ALL tires have the proper amount of air pressure in them the computer will reset the light. This may take as long as a couple of days (depending on how long you drive the car). Some take as long as 30 minutes of continuous driving to reset.

However, you need to be sure that ALL tires are properly inflated, EVEN THE FULL-SIZED SPARE, if you have a full-sized spare tire.

it could be a sensor problem and thats gonna require service.
did yopu inflate to what it says on the inside of drivers do ,,
because that what they need to be inflated to

Its the low tire light. On the drivers side door opening you should be able to find a sticker that tells you the proper tire inflation for you vehicle. Check all four tires to make sure they are properly inflated. If that tire is low it probably indicates there is a leak. Once all four tires are inflated drive the vehicle on the freeway for about ten minutes. the light should go out. If the light comes back on and the same tire is low than there is definitely a leak.

If all the tires are properly inflated and the light comes on there may be a problem with the sensor in that wheel. A TPMS scanner will be needed to see what the sensors are displaying for pressure.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

After the tires are all checked and properly inflated simply drive the vehicle non-stop for 8-10 minutes at highway speeds. The system will reset itself after that time if there is no problem. If a sensor is reading low or a tire is still low than the light will not reset. The proper tire inflation for your vehicle can be found on the drivers side front door. It should be around 36 psi.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

The yellow exclamation mark appears when your TPMS, AKA tire pressure monitoring system picks up on a low-pressure tire. It means that your tires aren't inflated to the recommended pressure. A simple fix is to inflate to the required PSI, and if the problem does not go away, drive down to the nearest garage, as you may have punctured tire at your hands.

Hello Mattingly.

Here is some information for you regarding your problem.

The Tire Inflation Monitor (TIM) system alerts the driver when the pressure changes in one of the tires. The system only detects a low pressure condition while the vehicle is being driven. Once a low tire pressure condition is detected, the system informs the driver that a low tire pressure condition exist's, whenever the ignition is ON.
The LOW TIRE message appears on the Instrument panel if the tire pressure in one tire becomes at least 82 kPa (12 psi) lower or higher than the other three tires. The message does not appear if more than one tire is low or high, or if the system is not calibrated properly. The system does not inform the driver which tire is low. To clear this message, set the tire pressures in all four tires to the proper pressures and perform the system reset procedure. Refer to Tire Inflation Monitor Reset Procedure for service procedure.
The Tire Inflation Monitor software requires approximately one half hour of straight line driving to complete the TIM autolearn. There are several speed ranges that the EBCM needs to learn the tire inflation configuration in order to have the full capability of detecting a low tire condition. The speed detection ranges are the following:

• 24-64 km/h (15-40 mph)
• 64-113 km/h (40-70 mph)
• 113-145 km/h (70-90 mph)

Each speed range has 2 modes of low tire detection.

• Monitor Mode 1
• Monitor Mode 2 The EBCM learns the tire inflation configuration for each speed range independently. In Monitor Mode 1, the EBCM has only partially learned the tire inflation configuration for the speed range and has limited detection capability for a low tire condition. In Monitor Mode 2, the EBCM has fully learned the tire inflation configuration for the speed range and has full detection capability for a low tire condition. If the EBCM is not in Monitor Mode 1 or Monitor Mode 2, a low tire condition cannot be detected because the EBCM has not learned the tire inflation configuration of the vehicle.

To reset (calibrate) the system:
Turn the ignition switch to RUN. Then press and hold the RESET button for about five seconds. The red RESET button is located inside the instrument panel fuse block on the right side of the dash.. The LOW TIRE light will come on and flash three times and then it will turn off.
The system completes the calibration process during driving.
The system normally takes 15 to 20 minutes of driving in each of three speed ranges to "learn" tire pressures. The speed rages are 15 to 40 mph (25 to 65 km/h), 40 to 65 mph (65 to 105 km/h) and above 65 mph (105 km/h).

There you are, this should fix you up.
Keep in mind this system uses wheel speed sensors to calculate. If one of your sensors isn't working your low tire light will remain on.

Thank you for using FixYa.

KL

That is a low tire light. Check the air pressure in your tires and make sure they are all the same. After properly inflating the tires, consult your owners manual on how to reset the light.

If your vehicle has the silver-metal valve cores (as opposed to black rebber), the tire pressure light goes out once the tires are at or above the minimum inflation pressure. Note that the SPARE is also checked for proper inflation by the system. What I would do is check the spare for proper inflation. If it is low, resetting it should cure your problem. If the light does NOT go out, the dealer who put the tires on may have damaged your tire pressure sensor. To check that, you need a Toyota technician to check the output of your 5 sensors with their tire pressure sensor diagnostic tool. If one is not reading, I would take the vehicle back to the tire guy & make him buy you a new one, They are not cheap.
Hope this helps.