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

DIAGNOSTIC PROCEDURE

1. CHECK CONNECTOR 
   1. Turn ignition switch OFF.
   2. Disconnect BCM harness connectors M18 and M20.
   3. Check terminals for damage or loose connections.

   Inspection results OK? 

   OK: GO TO 2.

   NG: Repair or replace damaged parts.

2. CHECK POWER SUPPLY CIRCUIT (BAT) 

   Check voltage between BCM harness connector M20 terminal 70 and ground.

   POWER SUPPLY CIRCUIT (BAT)
   
   

   Terminals			Voltage (Approx.)
   (+)		(-)
   Connector	Terminal	Ground	Battery voltage
   M20	70

   Fig 1: Checking Voltage Between BCM Connector M20 Terminal 70 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. Check voltage between BCM harness connector M18 terminal 38 and ground.
   POWER SUPPLY CIRCUIT (IGN)
   
   

   Terminals			Voltage (Approx.)
   (+)		(-)
   Connector	Terminal	Ground	Battery voltage
   M18	38

   Fig 2: Checking Voltage Between BCM Connector M18 Terminal 38 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 
   1. Turn ignition switch OFF.
   2. Check continuity between BCM harness connector M20 terminal 67 and ground.
   TERMINALS CONTINUITY CHART
   
   

   Terminals			Continuity
   (+)		(-)
   Connector	Terminal	Ground	Yes
   M20	67

   OK or NG 

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

   NG: Repair BCM ground circuit.

   Fig 3: Checking Continuity Between BCM Connector M20 Terminal 67 And Ground

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