Key Switch Signal Inspection (Without Intelligent Key)

Check if the key switch 10A fuse [No. 19, located in the fuse block (J/B)] is blown.

OK or NG 

OK: GO TO 2.

NG: Be sure to repair the cause of malfunction before installing new fuse. Refer to POWER SUPPLY ROUTING CIRCUIT .

With CONSULT-III 

1. Select "BCM".
2. With "DATA MONITOR" of "BUZZER", confirm "KEY ON SW" when the key is operated.

   "KEY ON SW" 

   When key is inserted into ignition key cylinder : ON 

   When key is removed from ignition key cylinder : OFF 

   Without CONSULT-III 

   Check voltage between BCM harness connector and ground.

   TERMINAL VOLTAGE REFERENCE
   
   

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

   Fig 1: Checking Voltage Between BCM Harness Connector And Ground

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

   OK or NG 

   OK: Key switch signal is OK. Return to "TROUBLE DIAGNOSIS ".

   NG: GO TO 3.

1. Turn ignition switch OFF.
2. Disconnect key switch connector.
3. Check continuity between key switch terminals 1 and 2.
   TERMINAL CONTINUITY REFERENCE
   
   

   Terminals		Condition	Continuity
   1	2	When key is inserted into ignition key cylinder	Yes
   		When key is removed from ignition key cylinder	No

   Fig 2: Checking Continuity Between Key Switch Terminals 1 And 2

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

   OK or NG 

   OK: GO TO 4.

   NG: Replace key switch.

1. Disconnect BCM connector.
2. Check continuity between BCM harness connector (A) and key switch harness connector (B).
   TERMINAL CONTINUITY REFERENCE
   
   

   A		B		Continuity
   Connector	Terminal	Connector	Terminal
   M18	37	M50	1	Yes

   Fig 3: Checking Continuity Between BCM And Key Switch Harness Connector Terminals

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check continuity between BCM harness connector (A) and ground.
   TERMINAL CONTINUITY REFERENCE
   
   

   A		Ground	Continuity
   Connector	Terminal
   M18	37		No

   OK or NG 

   OK: GO TO 5.

   NG: Repair harness or connector.

Check voltage between key switch harness connector and ground.

Fig 4: Checking Voltage Between Key Switch Harness Connector 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 harness or connector.