I have new Toyota Yaris Trend 2013 and wondering what should be the tyre pressure in front and rear tyres?
Tire pressures are listed on a sticker in the drivers door jam.
Here is an example of what you are looking for.
You can have three tyre sizes on your car, 165/70 14, 32Front 32Rear; 175/65 14, 32F 32R; 205/45 17 29F 28R. As Larry has pointed out, you will find a decal giving tyre sizes and pressures on the door jamb or on the inside of the fuel flap. They will also be present in the vehicles handbook.