Tires: How much air in H3 tire, Tire Size, placard

Question
How much air am i suppose to have on my H3 tires i have 16 inch tires that came with my H3 and i have 35 right now and my low tire pressure light keeps coming on, can i put 40 in them?

Answer
Mimi,

In order answer your question, I need three bits of information:

On every vehicle sold in the US, there is a sticker - commonly called that placard, that lists the original tire size and the proper pressure for that size.  I need both of those.

I also need the tire size currently on the vehicle.  You've said 35", but there are a variety of 35" tire sizes.  The format might look like this:  35 X 12.50 R 17LT - rather than the normal P265/70R17.

With these 3 bits of information I can give you the answer.