Low Tire Pressure Sensor

[bobolinko]

Originally Posted by DebbyM46227

I couldn't tell which it was. I looked at the dashboard each time I aired one up, and it didn't go off until I did the last tire.

It takes a little while for the TPMS to recognize that the air pressure is back to acceptable levels. Sometimes you will actually have to MOVE the car in order to initialize the reset. I have also had to revert to the button reset method on 2 occasions, as it would not reset by itself. The button method:

Press and hold in the TPMS Reset button and then turn the key to the engine run position, wait a few seconds and the light should go out. If ALL the wheels show correct pressure, an it still illuminates the (!) driving a short distance usually resets in about 2 blocks of travel. (It's a pain eh?)

[Shroomster]

Originally Posted by bobolinko

It takes a little while for the TPMS to recognize that the air pressure is back to acceptable levels. Sometimes you will actually have to MOVE the car in order to initialize the reset. I have also had to revert to the button reset method on 2 occasions, as it would not reset by itself. The button method:

Press and hold in the TPMS Reset button and then turn the key to the engine run position, wait a few seconds and the light should go out. If ALL the wheels show correct pressure, an it still illuminates the (!) driving a short distance usually resets in about 2 blocks of travel. (It's a pain eh?)

Unless your model year scion has this, toyota and all manufacturers have non physical interfaces for the tpms now. Most can only be accessed through the DLC or an onboard procedure.

[stschaub]

On a 2009 3-door, where's the reset switch?

[CTScott]

Originally Posted by stschaub

On a 2009 3-door, where's the reset switch?

It doesn't have a physical switch. It can only be manually reset using the Toyota Techstream tool:

3. CLEAR DTC
After repairing the malfunctions, clear the DTCs.
(a) Turn the ignition switch off.
(b) Connect a Techstream to the DLC3.
(c) Turn the ignition switch to ON and the tester on.
(d) Enter the following menus: Chassis / Tire Pressure Monitor / Trouble Codes /
(e) Clear the DTCs following the prompts on the tester screen

[KrazyDawg]

Originally Posted by DebbyM46227

This morning was the first really cold morning since I got my Yaris in June - it was 37 degrees here. I started out for work and the low tire pressure indicator came on, I drove to the nearest air thing, put my 75 cents in, and couldn't get any of the caps off - I guess whoever installed the factory tires didn't know their own strength.

Finally I got a guy to loosen all the caps for me, but none of the tires are really that low - 31 or 32 lbs. in each of them. Is this something I have to put up with all winter - that light on the dashboard is driving me crazy. (I saw the thread on un-doing the sensor but I'm not into all that.)

If all it takes is 3 lbs. to make it come on, that's a real pain in the butt. I think this sensor is the stupidest thing - cars have been around forever and we got along just fine without these sensors.

32 PSI is the minimum that it should be set too when measured cold. I would put in 38 PSI after driving it to the gas station to compensate for driving it warm and to factor in colder temps. Personally I use the max sidewell of 44 PSI.

[stschaub]

Thanks. I wondered why I couldn't find it. Will a Power-on-Reset (battery disconnect) work?

[CTScott]

Originally Posted by stschaub

Thanks. I wondered why I couldn't find it. Will a Power-on-Reset (battery disconnect) work?

A battery disconnect won't do anything for the TPWS, as it only gets ignition switched power.


With a little jumper wire, you can get the system to flash the light to tell you exactly why it's not happy:

http://www.yarisworld.com/forums/sho...8&postcount=11