Front Door Lock Assembly LH (Key Cylinder Switch) Check

With CONSULT-III 

Check front door key cylinder switch ("KEY CYL LK-SW") and ("KEY CYL UN-SW) in DATA MONITOR mode in CONSULT-III. Refer to "CONSULT-III FUNCTION (BCM) ".

• When key inserted and front key cylinder is turned to LOCK:

  KEY CYL LK-SW : ON 

• When key inserted and front key cylinder is turned to UNLOCK:

  KEY CYL UN-SW : ON 

  Without CONSULT-III 

  Check voltage between BCM connector M18 terminals 7, 8 and ground.

  VOLTAGE AND CONTINUITY SPECIFICATIONS
  
  

  Connector	Terminals		Condition	Voltage (V) (Approx.)
  	(+)	(-)
  M18	7	Ground	Neutral/Lock	5
  			Unlock	0
  	8		Neutral/Unlock	5
  			Lock	0

  Fig 1: Checking Voltage Between BCM Connector M18 Terminals 7, 8 And Ground

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

  OK or NG 

  OK: Front door lock assembly LH (key cylinder switch) signal is OK.

  NG: GO TO 2.

1. Turn ignition switch OFF.
2. Disconnect front door lock assembly LH (key cylinder switch).
3. Check continuity between front door lock assembly LH (key cylinder switch) connector D9 terminal 4 and body ground.
   VOLTAGE AND CONTINUITY SPECIFICATIONS
   
   

   Connector	Terminals	Continuity
   D9	4 - Ground	Yes

   Fig 2: Checking Continuity Between Front Door Lock Assembly LH (Key Cylinder Switch) Connector D9 Terminal 4 And Body Ground

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

   OK or NG 

   OK: GO TO 3.

   NG: Repair or replace harness.

Check continuity between front door lock assembly LH (key cylinder switch) terminals.

Fig 3: Checking Continuity Between Front Door Lock Assembly LH (Key Cylinder Switch) Terminals 4, 5 & 6

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

OK or NG 

OK: GO TO 4.

NG: Replace front door lock assembly LH (key cylinder switch). Refer to FRONT DOOR LOCK .

1. Disconnect BCM connector M18.
2. Check continuity between BCM connector M18 (A) terminals 7, 8 and front door lock assembly LH (key cylinder switch) connector D9 (B) terminals 5, 6 and body ground.
   VOLTAGE AND CONTINUITY SPECIFICATIONS
   
   

   Connector	Terminal	Connector	Terminal	Continuity
   A: M18	7	B: D9	5	Yes
   	8		6	Yes
   	7	Ground		No
   	8	Ground		No

   Fig 4: Checking Continuity Between M18 (A) Terminals 7, 8 And Connector D9 (B) Terminals 5, 6 And Body Ground

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

   OK or NG 

   OK: Front door lock assembly LH (key cylinder switch) circuit is OK.

   NG: Repair or replace harness.