For Key:

WARNING: This page is about a different car, the 2004 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

Check continuity between terminals of the A/T device connector.

Fig 1: Terminal Identification Table

Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Checking Detent Switch

Courtesy of NISSAN MOTOR CO., U.S.A.