Door Lock/Unlock Switch Check

WARNING: This page is about a different car, the 2006 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DOOR LOCK/UNLOCK SWITCH INPUT SIGNAL

With CONSULT-II

Check door lock/unlock switch ("CDL LOCK SW", "CDL UNLOCK SW") in DATA MONITOR mode in CONSULT-II. Refer to "DATA MONITOR ".

When door lock/unlock switch is turned to LOCK:
CDL LOCK SW : ON
When door lock/unlock switch is turned to UNLOCK:
CDL UNLOCK SW : ON

Fig 1: Identifying Scan Tool Display - Data Monitor
Courtesy of NISSAN MOTOR CO., U.S.A.

Without CONSULT-II

Remove key from ignition key cylinder.
Check the signal between BCM connector M18 terminal 22 and ground with oscilloscope when door lock/unlock switch is turned to LOCK or UNLOCK.

Make sure the signals which are shown in the figure below can be detected during 10 seconds just after the door lock/unlock switch is turned to LOCK or UNLOCK.

TERMINALS VOLTAGE CHART

Connector	Terminals		Voltage (V)
Connector	(+)	(-)	Voltage (V)
M18	22	Ground

Fig 2: Identifying Signal Between BCM Connector M18 Terminal 22 And Ground

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

OK or NG

OK : Door lock and unlock switch circuit is OK.
NG : GO TO 2.

CHECK DOOR LOCK/UNLOCK SWITCH GROUND HARNESS
1. Turn ignition switch OFF.
2. Disconnect main power window and door lock/unlock switch or power window and door lock/unlock switch RH
3. Check continuity between main power window and door lock/unlock switch connector D8 terminal 17 and ground.
  17 - Ground : Continuity should exist.
  
  Fig 3: Identifying Continuity Between Main Power Window And Door Lock/Unlock Switch Connector D8 Terminal 17 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check continuity between power window and door lock/unlock switch RH connector D105 terminal 11 and ground
  11 - Ground : Continuity should exist.
OK or NG
- OK : GO TO 3.
- NG : Repair or replace harness.
  
  Fig 4: Identifying Continuity Between Power Window And Door Lock/Unlock Switch RH Connector D105 Terminal 11 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK POWER WINDOW BUS CIRCUIT FOR OPEN
1. Disconnect BCM.
2. Check continuity between BCM connector M18 terminal 22 and main power window and door lock/unlock switch connector D7 terminal 14.
  22 - 14 : Continuity should exist.
  
  Fig 5: Identifying Continuity Between BCM Connector M18 Terminal 22 And Main Power Window And Door Lock/Unlock Switch Connector D7 Terminal 14
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check continuity between BCM connector M18 terminal 22 and power window and door lock/unlock switch RH connector D105 terminal 16.
  22 - 16 : Continuity should exist.
OK or NG
- OK : GO TO 4.
- NG : Repair or replace harness.
  
  Fig 6: Identifying Connector M18 Terminal 22 And Connector D105 Terminal 16
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK POWER WINDOW BUS CIRCUIT FOR SHORT
Check continuity between BCM connector M18 terminal 22 and ground.

22 - Ground : Continuity should not exist.

Fig 7: Identifying Continuity Between BCM Connector M18 Terminal 22 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
- OK : Replace main power window and door lock/unlock switch or power window and door lock/unlock switch RH
- NG : Repair or replace harness.