[Hilux]

A friends got a 04, and the light won't go off.

How does this stuff work? I assume it's got wireless sensors. But is there a re-set for the light if one ever gets low?

Or does it go off, on it's own, once the pressure's up?

What is the pressure?


2004, 17" SR5 V6 4WD, 17" Lumi's,

[Trevor]

When I bought mine, the light came on the following morning (it was a cold evening). The dealership sold me a car with flat tires. I aired 'em up to 32 psi and the light went off.

Sounds like there's a problem with your friend's.

[ToyotaDon]

Originally Posted by Hilux

17" Lumi's,

When I first saw this, I thought you were saying he has aftermarket wheels on there, but you must mean "aluminum wheels". If the wheels are aftermarket, someone could have forgotten to swap the valves/sensors over.

Now, that's just one of the reasons for the light to be on. I'm assuming an '04 has a few miles on it, and could have had tires replaced already. If you don't know the proper methods, it's real easy to damage the sensors when mounting tires.

Okay, as I'm typing, I'm also checking TIS for more info, and this is what I come up with...



























...please check the year again! 2006 was the first year for TPWS. Get back to us on this one.

[apeterson]

check that spair tire... if it is low it will make the light go on

[Duane]

Assuming it's like my 05 Tundra system.
5 wheels, 5th being the spare, all have a pressure transducer integral to the valve stem assembly. The system at minimal looks for a certain difference in pressure between the 5 sensors.
On cool days my spare will trip the light, so I roll under with my air compressor hose/chuck and manage to get at the valve stem and top it up a couple psi at a time until the light on my dash clears.
The local dealer service manager just mentioned to me on Friday that they were going to start using nitrogen, larger molecule, to inflate tires, just like Costco does, in an effort to avoid all the calls they get when it cools down and these service lights start coming on.
In short, perhaps check the inflation on your tires periodically and adjust as required.