My friend's 2006 RAV4 has a tire pressure warning indicator. A week ago, it lighted. We added more air on all four tires to 32 psi but didn't do any good. She went to the dealer tonight and was told that the spare tire is low.

This might save you a trip to the dealer.

Yup , I was scratchin my head till I read the manual. Aired up the spare and the light was history.