Diagnostic Procedure 3

Check Security Indicator Power Supply Circuit
1. Turn ignition switch OFF.
2. Disconnect the security indicator lamp connector.
3. Check voltage between security indicator lamp connector M73 terminal 2 (Y/G) and ground.
  
  Fig 1: Checking Power To Security Indicator Lamp
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  2 (Y/G) - Ground : Battery voltage
OK or NG
1. OK : GO TO 2.
2. NG : Check harness for open or short between fuse block and security indicator lamp.
Check Security Indicator Ground Circuit
1. Disconnect the NATS IMMU connector.
2. Check continuity between security indicator lamp connector M73 terminal 1 (G) and NATS IMMU connector M32 terminal 15 (G).
  
  Fig 2: Checking Continuity Security Indicator Lamp To NATS IMMU
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  1 (G) - 15 (G): Continuity should exist .
3. Check continuity between NATS IMMU connector M32 terminal 15 (G) and ground.
  15 (G) - Ground : Continuity should not exist .
OK or NG
1. OK : GO TO 3.
2. NG : Repair or replace harness.
Check Security Indicator Ground Signal
1. Connect NATS IMMU connector.
2. Check continuity between NATS IMMU connector M32 terminal 15 (G) and ground.
  
  Fig 3: Checking Security Indicator Ground Side
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  15 (G)- Ground : Continuity should exist intermittently .
OK or NG
1. OK : Replace security indicator lamp.
2. NG : Replace NATS IMMU.