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 

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 

Check voltage between BCM harness connector and ground.

Fig 1: Checking BCM Input Signal

Courtesy of NISSAN NORTH AMERICA, INC.

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.

   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 Key Switch

   Courtesy of NISSAN NORTH AMERICA, INC.

   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).

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

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

   A		Ground	Continuity
   Connector	Terminal
   M18	37		No

   Fig 3: Checking Key Switch Circuit

   Courtesy of NISSAN NORTH AMERICA, INC.

   OK or NG 

   OK: GO TO 5.

   NG: Repair harness or connector.

Check voltage between key switch harness connector and ground.

Fig 4: Checking Key Switch Power Supply Circuit

Courtesy of NISSAN NORTH AMERICA, INC.

OK or NG 

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

NG: Repair harness or connector.