Power Window Serial Link Check

1. Remove key and close front door LH and RH.
2. Check signal between BCM harness connector and ground with oscilloscope when door lock and unlock switch (LH and RH) 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 (LH and RH) is turned to "LOCK" or "UNLOCK".

   Terminal			Signal (Reference value)
   (+)		(-)
   BCM	Terminal
   M20	54	Ground	Courtesy of NISSAN NORTH AMERICA, INC.

Is the inspection result normal?

YES 

Power window serial link is OK.

NO 

GO TO STEP 2  .

1. Turn ignition switch OFF.
2. Disconnect BCM and main power window and door lock/unlock switch.
3. Check continuity between BCM harness connector and main power window and door lock/unlock switch harness connector.

   BCM connector	Terminal	Main power window and door lock/unlock switch connector	Terminal	Continuity
   M20	54	D7	11	Yes

4. Check continuity between BCM connector and ground.

   BCM connector	Terminal	Ground	Continuity
   M20	54		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.