Tire pressure warning light turned on the other day. Went and checked tires, one was a little low so adjusted to recommended spec. Light still on. Anyone know what I'm supposed to do now?

 

Start with reading the owners manual.

Sounds like you need to reinitialize the TPWS.

Did you also check your spare? Not sure what the IS has for a spare, but if its a full size, theres a good chance it may have a sensor as well. If its a temp it will not have a sensor.

 

Anybody went into your car and play with satellite switch? I mean your friend or somebody may play with the satellite switch and press the TPWS to "Second set"

 

My girlfriend drove it one day and then that light came on. I did notice when i play with the switch when it goes on main the warning disappears and on 2nd it turns on. I was getting the impression that something is really wrong and when i put it on main its just turning off the warning. So when its on "2nd" its for the spare? I have a temp spare, not a full size.

 

2nd isn't necessarily for the spare, but instead for a spare set of wheels and tires... for instance, if you lived up north and had a set of snow wheels and tires, you could have them as the 2nd set, so that it would be easy to switch between the two...

 

Thanks very much for this tip. Warning light would not reset, even after checking all tires on the car. After seeing your tip, I checked the spare; it was low. Once I inflated that, all was fine.