
Originally Posted by
confused shoes
^Yes, using the existing harness should be your better option.
As for the ignition circuit, I can not tell as I don't have an Innova. But you can also use the ACC. The purpose of it connected to ACC or Ign is that if you forgot to turn off the fog switch, the key will turn it off when you remove it. The ACC circuit is where the radio supply is connected. The Ing is where the supply of the power windows is connected.
If you have a multi-meter, you can easily find them.