Inspection 2: Warning Lamp Stays On When Ignition Switch Is Turned On

DIAGNOSTIC PROCEDURE

1. CHECK CONNECTOR 
   1. Disconnect BCM harness connectors M3 and M4.
   2. Check terminals for damage or loose connections.

   OK or NG 

   OK : GO TO 2.

   NG : Repair or replace damaged parts.

2. CHECK POWER SUPPLY CIRCUIT (BATTERY) 

   Make sure voltage between BCM harness connector M4 terminals 42 (GY), 55 (R) and ground.

   TERMINAL VOLTAGE REFERENCE
   
   

   Terminal			Voltage
   (+)		(-)
   Connector	Terminal (Wire color)	Ground	12V
   M4	42 (L/R), 55 (G)

   Fig 1: Identifying Voltage Between BCM Harness Connector M4 Terminals 42 (GY), 55 (R) And Ground

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

   OK or NG 

   OK : GO TO 3.

   NG : Check BCM power supply circuit for open or short.

3. CHECK POWER SUPPLY CIRCUIT (IGN) 
   1. Turn ignition switch ON.
   2. Make sure voltage between BCM harness connector M3 terminal 38 (W/L) and ground.
      TERMINAL VOLTAGE REFERENCE
      
      

      Terminal			Voltage
      (+)		(-)
      Connector	Terminal (Wire color)	Ground	12V
      M3	38 (W/L)

      Fig 2: Identifying Voltage Between BCM Harness Connector M3 Terminal 38 (W/L) And Ground

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

   OK or NG 

   OK : GO TO 4.

   NG : Check BCM power supply circuit for open or short.

4. CHECK GROUND CIRCUIT 
   • Check continuity between BCM harness connector M4 terminal 49(B), 52 (B) and ground.
     TERMINAL CONTINUITY REFERENCE
     
     

     Terminal			Continuity
     (+)		(-)
     Connector	Terminal (Wire color)	Ground	Should exist.
     M4	49 (B), 52 (B)

     Fig 3: Identifying Continuity Between BCM Harness Connector M4 Terminal 49(B), 52 (B) And Ground

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

   OK or NG 

   OK : Replace BCM. Refer to "REMOVAL AND INSTALLATION OF BCM ".

   NG : Repair or replace BCM ground circuit.