Nissan Sentra B18 (2020-2025) Service Manual: Mode Door Motor
Diagnosis Procedure
Diagnosis Procedure
-
CHECK MODE DOOR MOTOR POWER SUPPLY
-
-
Ignition switch ON.
-
Check voltage between mode door motor harness connector and ground.
+
–
Voltage
(Approx.)
Mode door motor
Connector
Terminal
M166
1
Ground
Battery voltage
-
Is the inspection result normal?
YES >>GO TO 2.
NO >>GO TO 5.
-
-
CHECK MODE DOOR MOTOR GROUND CIRCUIT
-
-
Ignition switch OFF.
-
Disconnect mode door motor connector and A/C amp. connector.
-
Check continuity between mode door motor harness connector and ground.
Mode door motor
—
Continuity
Connector
Terminal
M166
2
Ground
Yes
-
Is the inspection result normal?
YES >>GO TO 3.
NO >>Repair harness or connector.
-
-
CHECK MODE DOOR MOTOR LIN SIGNAL
-
-
Connect mode door motor connector and A/C amp. connector.
-
Ignition switch ON.
-
Confirm output waveform between mode door motor harness connector and ground using oscilloscope.
+
—
Output waveform
Mode door motor
Connector
Terminal
M166
3
Ground

-
Is the inspection result normal?
YES >>GO TO 4.
NO >>GO TO 6.
-
-
CHECK INSTALLATION OF MODE DOOR MOTOR
-
Check mode door motor is properly installed. Refer to Exploded View.
Is the inspection result normal?
YES >>Replace mode door motor. Refer to Removal and Installation.
NO >>Repair or replace malfunctioning part.
-
-
CHECK MODE DOOR MOTOR POWER SUPPLY CIRCUIT FOR OPEN
-
-
Ignition switch OFF.
-
Disconnect mode door motor connector and A/C amp. connector.
-
Check continuity between mode door motor harness connector and A/C amp. connector.
Mode door motor
A/C amp.
Continuity
Connector
Terminal
Connector
Terminal
M166
1
M81
1
Yes
-
Is the inspection result normal?
YES >>Replace A/C amp. Refer to Removal and Installation.
NO >>Repair harness or connector.
-
-
CHECK MODE DOOR MOTOR LIN SIGNAL CIRCUIT FOR OPEN
-
-
Ignition switch OFF.
-
Disconnect mode door motor connector and A/C amp. connector.
-
Check continuity between mode door motor harness connector and A/C amp. harness connector.
Mode door motor
A/C amp.
Continuity
Connector
Terminal
Connector
Terminal
M166
3
M81
22
Yes
-
Is the inspection result normal?
YES >>Replace A/C amp. Refer to Removal and Installation.
NO >>Repair harness or connector.
-
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