Nissan Sentra B18 (2020-2025) Service Manual: Door Motor Circuit

Diagnosis Procedure

If all of door motor DTCs are detected, check this circuit.

1. CHECK DOOR MOTOR POWER SUPPLY

   1. 1. Ignition switch ON.

      2. Check voltage between intake door motor harness connector and ground.

         +		-	Voltage (Approx.)
         Intake door motor
         Connector	Terminal
         M165	1	Ground	Battery voltage

   Is the inspection result normal?

   YES >>

   GO TO 2.

   NO >>

   GO TO 7.

2. CHECK DOOR MOTOR GROUND CIRCUIT FOR OPEN

   1. 1. Ignition switch OFF.

      2. Disconnect intake door motor connector.

      3. Check continuity between intake door motor harness connector and ground.

         Intake door motor		—	Continuity
         Connector	Terminal
         M165	2	Ground	Yes

   Is the inspection result normal?

   YES >>

   GO TO 3.

   NO >>

   Repair harness or connector.

3. CHECK DOOR MOTOR LIN SIGNAL

   1. 1. Connect intake door motor connector.

      2. Ignition switch ON.

      3. Confirm output waveform between intake door motor harness connector and ground with oscilloscope.

         +		-	Output waveform
         Intake door motor
         Connector	Terminal
         M165	3	Ground

   Is the inspection result normal?

   YES >>

   GO TO 4.

   NO >>

   GO TO 6.

4. CHECK DOOR MOTOR LIN SIGNAL CIRCUIT FOR OPEN

   1. 1. Ignition switch OFF.

      2. Disconnect A/C auto amp. connector and intake door motor connector.

      3. Check continuity between A/C auto amp. harness connector and intake door motor harness connector.

         A/C auto amp.		Intake door motor		Continuity
         Connector	Terminal	Connector	Terminal
         M33	22	M165	3	Yes

   Is the inspection result normal?

   YES >>

   GO TO 5.

   NO >>

   Repair harness or connector.

5. CHECK INTERMITTENT INCIDENT

   1. Check intermittent incident. Refer to Intermittent Incident.

   >>

   Inspection End.

6. CHECK DOOR MOTOR LIN SIGNAL CIRCUIT FOR SHORT

   1. 1. Ignition switch OFF.

      2. Disconnect following connectors:

         • A/C auto amp.

         • Air mix door motor RH

         • Air mix door motor LH

         • Mode door motor

         • Intake door motor

      3. Check continuity between A/C auto amp. harness connector and ground.

         A/C auto amp.		—	Continuity
         Connector	Terminal
         M33	22	Ground	No

   Is the inspection result normal?

   YES >>

   Replace A/C auto amp. Refer to Removal and Installation.

   NO >>

   Repair harness or connector.

7. CHECK DOOR MOTOR POWER SUPPLY CIRCUIT FOR OPEN

   1. 1. Ignition switch OFF.

      2. Disconnect intake door motor connector and A/C auto amp. connector.

      3. Check continuity between intake door motor harness connector and A/C auto amp. harness connector.

         Intake door motor		A/C auto amp.		Continuity
         Connector	Terminal	Connector	Terminal
         M165	1	M33	1	Yes

   Is the inspection result normal?

   YES >>

   GO TO 8.

   NO >>

   Repair harness or connector.

8. CHECK DOOR MOTOR POWER SUPPLY CIRCUIT FOR SHORT

   1. 1. Disconnect following connectors:

         • Air mix door motor RH

         • Air mix door motor LH

         • Mode door motor

      2. Check continuity between A/C auto amp. harness connector and ground.

         A/C auto amp.		—	Continuity
         Connector	Terminal
         M33	1	Ground	No

   Is the inspection result normal?

   YES >>

   Replace A/C auto amp. Refer to Removal and Installation.

   NO >>

   Repair harness or connector.

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