2. Check Key Switch Power Supply

1. Disconnect key switch harness connector.
2. Check voltage between key switch harness connector terminal 1 and ground.

Battery voltage should exist. 

Refer to WIRING DIAGRAM - KEYLESS  .

OK or NG 

1. OK: GO TO 3  .
2. NG: Check the following
   • 7.5A fuse [No. 28, located in the fuse block (J/B)]
   • Harness for open or short between key switch and fuse

Fig 1: Checking Key Switch Power Supply

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