Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

1. CHECK FUSE

   Check if the key switch 10A fuse (No. 25, located in the fuse and fusible link box) is blown.

   Is the fuse blown? 

   YES: Be sure to repair the cause of malfunction before installing new fuse.

   NO: GO TO 2

2. CHECK BCM INPUT SIGNAL

   Check voltage between BCM harness connector M18 terminal 37 and ground.

   Terminals			Condition	Voltage (Approx.)
   (+)		(-)
   BCM connector	Terminal
   M18	37	Ground	Key is inserted	Battery voltage
   			Key is removed	0

   Fig 1: Checking Voltage Between BCM Connector M18 Terminal 37 And Ground

   Courtesy of NISSAN NORTH AMERICA, INC.

   Is the inspection result normal? 

   YES: Inspection End.

   NO: GO TO 3

3. CHECK KEY SWITCH CIRCUIT
   1. Disconnect BCM connector M18 and key switch connector.
   2. Check continuity between BCM harness connector M18 (A) terminal 37 and key switch harness connector M27 (B) terminal 1.

      BCM		Key switch		Continuity
      Connector	Terminal	Connector	Terminal
      M18 (A)	37	M27 (B)	1	Yes

   3. Check continuity between BCM harness connector M18 (A) terminal 37 and ground.

      BCM		Ground	Continuity
      Connector	Terminal
      M18 (A)	37		No

      Fig 2: Checking Continuity Between BCM Connector M18 Terminal 37 And Key Switch Connector M27 (B) Terminal 1

      Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO 4

      NO: Repair harness or connector.

4. CHECK KEY SWITCH POWER SUPPLY CIRCUIT

   Check voltage between key switch harness connector M27 terminal 2 and ground.

   Terminals			Voltage (Approx.)
   (+)		(-)
   Key switch	Terminal
   M27	2	Ground	Battery voltage

   Fig 3: Checking Voltage Between Key Switch Connector M27 Terminal 2 And Ground

   Courtesy of NISSAN NORTH AMERICA, INC.

   Is the inspection result normal? 

   YES: Replace key switch.

   NO: Repair harness or connector.