When I change my tire pressure...

Actually there is a way to reset the system, but I don't remember how (I've never done it, but the dealer showed us how at their new owner reception). I do recall that he said you put set the tires to the psi you want and then reset it at that pressure, and you should not get any warning lights at that new desired pressure.

I'm sure someone here knows what button to press to reset it. If not, ask someone in the dealer's service department (if no one seems to know, ask to talk to one of the hybrid certified mechanics).

 

<div class='quotetop'>QUOTE(nybiker @ Aug 12 2007, 10:43 PM) [snapback]494470[/snapback]</div>

1) The TMPS does not light the warning for pressure being too high.
2) The button to reset to the new pressure is under the steering wheel, right by the SKS turn off button.

 

here's a quick read on the TPMS
http://priuschat.com/index.php?showtopic=26995

 

Welcome to PriusChat, GreenJohnny. Congratulations on her new car...

Galaxee's reference is the right one. You can fool the TPMS, but only on the down side, if you want less than a 25% drop warning. Say you know what PSI you want the warning at: over inflate by 33% (33% up = 25% down), reset the TPMS switch under the steering column, then deflate to the pressure you want to run at. The TPMS alarm will light when pressure drops to the lower limit you chose.

 

I have had mine set on 40/38 for the last few months, no light has ever gone on because of it. It did go on when the psi was 30 in one tire, but that was because I had a nail in it, a slow leak.

 

That Galaxee link is really great! I think my 2000 Sienna tire pressure monitoring worked off the abs system, if so, this one is certainly more complicated!