POWER WINDOW MAIN SWITCH: Diagnosis Procedure

Power Window Serial Link Check

1. CHECK POWER WINDOW SWITCH OUTPUT SIGNAL
   1. Remove Intelligent Key, and close front door LH and RH.
   2. Check signal between BCM connector M18 terminal 40 and ground with oscilloscope when door lock and unlock switch (key cylinder switch) is turned to "LOCK" or "UNLOCK".
   3. Check that signals which are shown in the figure below can be detected during 10 seconds just after door lock and unlock switch (key cylinder switch) is turned to "LOCK" or "UNLOCK".
   Fig 1: Checking Signal Between BCM Connector Terminal 40 And Ground

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

   Terminal			Signal (Reference value)
   (+)		(-)
   BCM connector	Terminal
   M18	40	Ground	Courtesy of NISSAN MOTOR CO., U.S.A.

   Is the inspection result normal? 

   YES: Power window serial link is OK.

   NO: GO TO 2

2. CHECK POWER WINDOW SERIAL LINK CIRCUIT
   1. Turn ignition switch OFF.
   2. Disconnect BCM connector M18 and main power window and door lock/unlock switch connector D7.
   3. Check continuity between BCM connector M18 (A) terminal 40 and main power window and door lock/unlock switch connector D7 (B) terminal 14.
      CONTINUITY SPECIFICATION
      
      

      BCM connector	Terminal	Main power window and door lock/unlock switch connector	Terminal	Continuity
      M18 (A)	40	D7 (B)	14	Yes

      Fig 2: Checking Continuity Between BCM Connector M18 (A) Terminal 40 And Ground

      Courtesy of NISSAN MOTOR CO., U.S.A.
   4. Check continuity between BCM connector M18 (A) terminal 40 and ground.
   CONTINUITY SPECIFICATION
   
   

   BCM connector	Terminal	Ground	Continuity
   M18 (A)	40		No

   Is the inspection result normal? 

   YES: Replace main power window and door lock/unlock switch. Refer to "REMOVAL AND INSTALLATION ".

   NO: Repair or replace harness or connectors.

Power Window Serial Link Check

1. CHECK POWER WINDOW SWITCH OUTPUT SIGNAL
   1. Remove Intelligent Key, and close front door LH and RH.
   2. Check signal between BCM connector M18 terminal 40 and ground with oscilloscope when door lock and unlock switch (key cylinder switch) is turned to "LOCK" or "UNLOCK".
   3. Check that signals which are shown in the figure below can be detected during 10 seconds just after door lock and unlock switch (key cylinder switch) is turned to "LOCK" or "UNLOCK".
   Fig 1: Checking Signal Between BCM Connector Terminal 40 And Ground

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

   Terminal			Signal (Reference value)
   (+)		(-)
   BCM connector	Terminal
   M18	40	Ground	Courtesy of NISSAN MOTOR CO., U.S.A.

   Is the inspection result normal? 

   YES: Power window serial link is OK.

   NO: GO TO 2

2. CHECK POWER WINDOW SERIAL LINK CIRCUIT
   1. Turn ignition switch OFF.
   2. Disconnect BCM connector M18 and main power window and door lock/unlock switch connector D7.
   3. Check continuity between BCM connector M18 (A) terminal 40 and main power window and door lock/unlock switch connector D7 (B) terminal 14.
      CONTINUITY SPECIFICATION
      
      

      BCM connector	Terminal	Main power window and door lock/unlock switch connector	Terminal	Continuity
      M18 (A)	40	D7 (B)	14	Yes

      Fig 2: Checking Continuity Between BCM Connector M18 (A) Terminal 40 And Ground

      Courtesy of NISSAN MOTOR CO., U.S.A.
   4. Check continuity between BCM connector M18 (A) terminal 40 and ground.
   CONTINUITY SPECIFICATION
   
   

   BCM connector	Terminal	Ground	Continuity
   M18 (A)	40		No

   Is the inspection result normal? 

   YES: Replace main power window and door lock/unlock switch. Refer to "REMOVAL AND INSTALLATION ".

   NO: Repair or replace harness or connectors.