Check Trunk Open Signal

WARNING: This page is about a different car, the 2003 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

CHECK BCM OUTPUT SIGNAL
1. Remove electronic key from ignition key cylinder.
2. Check voltage between BCM connector M4 terminal 109 (Y/B) and ground.
  
  Fig 1: Identifying BCM Connector And Ground Table
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK >> BCM output signal (trunk open signal) is OK.

NG >> Replace BCM.