Nissan Sentra B18 (2020-2025) Service Manual: Main Power Window and Door Lock/unlock Switch

Diagnosis Procedure

1. CHECK FUSE

   1. 1. Ignition switch OFF.

      2. Check that any of the following fuses are not blown (open):

         Signal name	Fuse No.	Capacity
         Ignition power supply	52	20 A
         	53	30 A

   Is the fuse blown (open)?

   YES >>

   Repair the blown (open) fuse after repairing the affected circuit if a fuse is blown (open).

   NO >>

   GO TO 2.

2. CHECK MAIN POWER WINDOW AND DOOR LOCK/UNLOCK SWITCH POWER SUPPLY

   1. 1. Disconnect main power window and door lock/unlock switch connector.

      2. Ignition switch ON.

      3. Check voltage between main power window and door lock/unlock switch harness connector and ground.

         (+)		(–)	Voltage (Approx.)
         Main power window and door lock/unlock switch
         Connector	Terminal
         D5	11	Ground	Battery voltage
         	12

   Is the inspection result normal?

   YES >>

   GO TO 7.

   NO >>

   GO TO 3.

3. CHECK POWER WINDOW RELAY POWER SUPPLY

   1. 1. Ignition switch OFF.

      2. Remove power window relay.

      3. Check voltage between fuse block (J/B) harness connector and ground.

         (+)		(–)	Voltage (Approx.)
         Fuse block (J/B)
         Terminal
         Power window relay	1	Ground	Battery voltage
         	5

   Is the inspection result normal?

   YES >>

   GO TO 4.

   NO >>

   Repair or replace harness.

4. CHECK MAIN POWER WINDOW AND DOOR LOCK/UNLOCK SWITCH POWER SUPPLY CIRCUIT

   1. Check continuity between fuse block (J/B) harness connector and main power window and door lock/unlock switch harness connector.

      Fuse block (J/B)		Main power window and door lock/unlock switch		Continuity
      Terminal		connector	Terminal
      Power window relay	3	D5	11	Yes
      			12

   Is the inspection result normal?

   YES >>

   GO TO 5

   NO >>

   Repair or replace harness.

5. CHECK POWER WINDOW RELAY CONTROL CIRCUIT

   1. 1. Disconnect BCM connector.

      2. Check continuity between BCM harness connector and fuse block (J/B) harness connector.

         BCM		Fuse block (J/B)		Continuity
         Connector	Terminal	Terminal
         M84	32	Power window relay	2	Yes

      3. Check continuity between BCM harness connector and ground.

         BCM		—		Continuity
         Connector	Terminal
         M84	32	Ground		No

   Is the inspection result normal?

   YES >>

   GO TO 6.

   NO >>

   Repair or replace harness.

6. CHECK POWER WINDOW RELAY

   1. Check power window relay.

      Refer to Component Inspection.

   Is the inspection result normal?

   YES >>

   Replace BCM. Refer to Removal and Installation.

   NO >>

   Replace power window relay.

7. CHECK MAIN POWER WINDOW AND DOOR LOCK/UNLOCK SWITCH GROUND CIRCUIT

   1. 1. Ignition switch OFF.

      2. Check continuity between main power window and door lock/unlock switch harness connector and ground.

         Main power window and door lock/unlock switch		—	Continuity
         Connector	Terminal
         D5	13	Ground	Yes

   Is the inspection result normal?

   YES >>

   Inspection End.

   NO >>

   Repair or replace harness.

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