Low Tire Pressure Indicator is always on

The TPS sensor may be dirty or defective...be sure all tires are above 33 psi...

Look in your owners manual

{: ) The 2002 Oldsmobile uses the TIM system. Here is an overview of how it works:
The tire inflation monitoring (TIM) system detects the differences in tire rotation speeds that are caused by changes in tire pressure. The TIM may not alert the driver if the pressure in more than one tire is high or low. The TIM also may not operate properly if the spare tire is in use.
The TIM system can alert the driver when a large change in the pressure of one tire exists. The system only detects a low pressure condition while the vehicle is being driven.
The LOW TIRE PRESSURE indicator turns ON in the instrument cluster if the tire pressure in one tire becomes 12 psi (55 kPa) lower or higher than the other 3 tires and the ignition switch is in the ON position. 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. In order to clear this message, equalize the tire pressures in all 4 tires and perform the Tire Inflation Monitor Resetting. In addition, the indicator may come ON if a low voltage condition is present.

In other words, this is not like the TPM (Tire Pressure Monitoring) system that is being used in later model vehicles, wherein the TPM sensors are inside the wheel, integrated to the tire valve. The TPM sensors detect changes in tire pressure and temperature, and sends out radio signals to the RCDLR, to be decoded by the BCM and the instrument cluster.

All you have to do to reset the TPMS light is make sure all your tires are set around 35-38 psi then drive it a a couple miles and the light will turn off. If it is blinking then you have a sensor issue and you will have to take it to the dealer. The tire pressure warning light is yellow not red."Your vehicle has also been equipped with a TPMS malfunction indicator to indicate when the system is not operating properly. The TPMS malfunction indicator is combined with the low tire pressure telltale. When the system detects a malfunction, the telltale will flash for approximately one minute and then remain continuously illuminated. This sequence will continue upon subsequent vehicle start-ups as long as the malfunction exists. When the malfunction indicator is illuminated, the system may not be able to detect or signal low tire pressure as intended. TPMS malfunctions may occur for a variety of reasons, including the installation of replacement or alternate tires or wheels on the vehicle that prevent the TPMS from functioning properly. Always check the TPMS malfunction telltale after replacing one or more tires or wheels on your vehicle to ensure that the replacement or alternate tires and wheels allow"

if u have the right tire pressure in the tires the light will go out . but sometimes you have to put 5 to 10 miles on the car to reset

I believe that is your tire pressure monitoring indicator, check tire pressure, this indicator can go on when weather gets colder, and may go off after driving and tires warm up. Check pressure though to get best mpg and tire wear.

the last time I had a flat the tire pressure monitor came on a little too late. once the tire was replaced and brought up to pressure it reset itself. check your spare tire. have the tire that was repaired still has the module on the rim. they may have given you a different rim

You have to "Teach" the tire sensors to the correct pressure. The 02 Sienna does not measure the actual PSI tire pressures, it measures the RPM of the tires. with the tires set to specs, the rotation RPM is "x". If a tire goes low, the rotation RPM would bt "y", and that will light the light.

The proceedure: Set the tires to specs with a known good pressure gauge. The ones that you can put in your pocket, that looks like a pen, are alway sincorrect. Get one with a needle reading. Set the tires correctly. Now, press the reset button, hold it until the light blinks 3 times. Drop it into gear, and DRIVE IT. 8-12 miles, above 19 MPH, and UNDER 61 MPH. This will re-teach the ABS computer the correct values.

It is on the same button as the Trip Odometer. Cycle through until you see Tire Reset and hold the button down.

hold reset button for about 10 seconds. your tire pressure would reset