Front Door Lock Assembly LH (Key Cylinder Switch) Check

WARNING: This page is about a different car, the 2006 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DOOR KEY CYLINDER SWITCH LH

With CONSULT-II

Check front door lock assembly LH (key cylinder switch) ("KEY CYL LK-SW") and ("KEY CYL UN-SW) in DATA MONITOR mode in CONSULT-II. Refer to "DATA MONITOR ".

When key inserted in front key cylinder is turned to LOCK:
KEY CYL LK-SW: ON
When key inserted in front key cylinder is turned to UNLOCK:
KEY CYL UN-SW: ON

Fig 1: CONSULT II Display - Data Monitor
Courtesy of NISSAN MOTOR CO., U.S.A.

Without CONSULT-II

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

TERMINALS CONDITION CONTINUITY CHART

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

Fig 2: Checking Voltage Between BCM Connector M18 Terminals 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.

CHECK FRONT DOOR LOCK ASSEMBLY LH (KEY CYLINDER SWITCH)

Turn ignition switch OFF.
Disconnect front door lock assembly LH (key cylinder switch).
Check continuity between front door lock assembly LH (key cylinder switch) connector terminals 3, 4 and 5.

TERMINALS CONDITION CONTINUITY CHART

Terminals	Condition	Continuity
4 - 5	Key is turned to LOCK.	Yes
4 - 5	Key is in N position or turned to UNLOCK	No
3 - 4	Key is turned to UNLOCK.	Yes
3 - 4	Key is in N position or turned to LOCK	No

Fig 3: Checking Continuity Between Front Door Lock Assembly LH

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

OK or NG

OK: GO TO 3.

NG: Replace front door lock assembly LH (key cylinder switch). Refer to "REMOVAL AND INSTALLATION ".

CHECK FRONT DOOR LOCK ASSEMBLY LH HARNESS
1. Disconnect BCM.
2. Check continuity between BCM connector M18 terminals 7, 8 and front door lock assembly LH connector D14 terminals 3, 5.
  7-3: Continuity should exist .
  
  8-5: Continuity should exist .
3. Check continuity between BCM connector M18 terminals 7, 8 and ground.
  7 - Ground: Continuity should not exist .
  
  8 - Ground: Continuity should not exist .
Fig 4: Checking Continuity Between BCM Connector M18 Terminals And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 4.

NG: Repair or replace harness.
CHECK FRONT DOOR LOCK ASSEMBLY LH GROUND
Check continuity between front door lock assembly LH connector D14 terminal 4 and ground.

4 - Ground: Continuity should exist .

Fig 5: Checking Continuity Between Front Door Lock Assembly LH Connector D14 Terminal 4 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 5.

NG: Repair or replace harness.
CHECK BCM OUTPUT VOLTAGE
1. Connect BCM.
2. Check voltage between BCM connector M18 terminals 7, 8 and ground.
  7 - Ground: Approx. 5V
  
  8 - Ground: Approx. 5V
Fig 6: Checking Voltage Between BCM Connector M18 Terminals And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: Check condition of the harness and connector.

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