[leslieman1]

Where could I purchase wiring diagram for this vehicle

 

[JohnnyMac]

Give this a try....

Nissan Wiring

 

[684Alpha]

If the above doesn't have what you want, try this http://www.nicoclub.com/FSM/Titan/2006_Titan/fwd.pdf, then follow the 2 or 3 letter abbreviation and click on it here Index of /FSM/Titan/2006_Titan.

Good luck