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.

   CONNECTOR TERMINAL VOLTAGE SPECIFICATION
   
   

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

   OK or NG 

   OK: Key switch signal is OK. Return to "SYMPTOM CHART ".

   NG: GO TO 3.

   Fig 1: Checking Voltage Between BCM Harness Connector And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. CHECK KEY SWITCH 
   1. Turn ignition switch OFF.
   2. Disconnect key switch connector.
   3. Check continuity between key switch terminals 1 and 2.
      CONNECTOR TERMINAL CONTINUITY SPECIFICATION
      
      

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

   OK or NG 

   OK: GO TO 4.

   NG: Replace key switch.

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

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. CHECK KEY SWITCH CIRCUIT 
   1. Disconnect BCM connector.
   2. Check continuity between BCM harness connector (A) and key switch harness connector (B).
      CONNECTOR TERMINAL CONTINUITY SPECIFICATION
      
      

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

   3. Check continuity between BCM harness connector (A) and ground.
      CONNECTOR TERMINAL CONTINUITY SPECIFICATION
      
      

      A		Ground	Continuity
      Connector	Terminal
      M18	37		No

   OK or NG 

   OK: GO TO 5.

   NG: Repair harness or connector.

   Fig 3: Checking Continuity Between BCM Harness Connector And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
5. CHECK KEY SWITCH POWER SUPPLY CIRCUIT 

   Check voltage between key switch harness connector and ground.

   CONNECTOR TERMINAL VOLTAGE SPECIFICATION
   
   

   Terminals			Voltage (Approx.)
   (+)		(-)
   Key switch connector	Terminal
   M50	2	Ground	Battery voltage

OK or NG 

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

NG: Repair harness or connector.

Fig 4: Checking Voltage Between Key Switch Harness Connector And Ground

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