WARNING: This page is about a different car, the 2005 Infiniti FX45 and 2005 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect ICC steering switch.
Check resistance between M203 terminals 14 and 15 by pressing each switch.
Fig 1: Resistance Specifications
Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Checking Resistance Between M203 Terminals 14 And 15 By Pressing Switch