RS install question

I am going to install an autopage 850 rs in a maxima and I noticed that it has two accessory wires and 1 ign wire. The RS unit has two ing wires and 1 accessory wire.  Could I take the second ign wire coming from the RS unit and use it as a second accessory wire that the vehicle needs.  I wont use it as the heator blower motor, I am assuming the second accessory wire in the 2003 maxima is for the radio????   Do I even need to hook up the second acessory wire in the max?  I heard its best to power everything up just as the key does when turning the ign.  Thanks....

I only remember that the 2003 nissan maximo only have one accessory wire.   (red)

You can' t use the 2nd IGN from the to power the 2nd ACC wire. These wires have different characteristics and output a 12 volt signal at different intervals of the key cylinder. Here is the wire colors and also the relay configuration to power up the 2nd ACC :

IGNITION|BLACK / YELLOW        |+  |ignition harness           
ACCESSORY|red                 |+  |ignition harness           
SECOND ACCESSORY|WHITE/ blue          |+  |ignition harness