WARNING: This page is about a different car, the 2011 Infiniti EX35. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Relay Control System - System Diagram
Courtesy of NISSAN MOTOR CO., U.S.A.
NOTE:
Steering lock relay and steering lock unit, as shown in the system diagram, are for models with steering lock unit only.