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.
Disconnect door switch harness.
Check continuity between door switch connector terminals.
Fig 1: Door Switch Terminals Continuity Specifications (Right & Left)
Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Checking Continuity Between Door Switch Connector Terminals