WARNING: This page is about a different car, the 2006 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Trouble Diagnosis Work Flow Chart
Courtesy of NISSAN MOTOR CO., U.S.A.
"POWER DOOR LOCK SYSTEM" Diagnosis; refer to
"WORK FLOW ".
"REMOTE CONTROL SYSTEM" Diagnosis; refer to
"WORK FLOW ".