Nissan Sentra B18 (2020-2025) Service Manual / Body Exterior, Doors, Roof & Vehicle Security / Door & Lock :: Dtc/circuit Diagnosis / Door Switch

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

Component Function Check

CHECK FUNCTION

CONSULT

Select "Door switch AS", "Door switch DR", "Door switch RL" or "Door switch RR" in "Data Monitor" mode of "BCM(DOOR LOCK)".
Check that the function operates normally according to the following conditions:

Monitor Item	Condition		Status
DOOR switch DR	Front door LH	Open	On
DOOR switch DR	Front door LH	Closed	Off
DOOR switch AS	Front door RH	Open	On
DOOR switch AS	Front door RH	Closed	Off
DOOR switch RL	Rear door LH	Open	On
DOOR switch RL	Rear door LH	Closed	Off
DOOR switch RR	Rear door RH	Open	On
DOOR switch RR	Rear door RH	Closed	Off

Is the inspection result normal?

YES>>

Door switch is OK.

NO>>

Refer to Diagnosis Procedure.

Diagnosis Procedure

CHECK DOOR SWITCH INPUT SIGNAL

Ignition switch OFF.
Disconnect malfunctioning door switch connector.

Check signal between malfunctioning door switch harness connector and ground using oscilloscope.

(+)			(–)	Signal (Reference value)
Door switch
Connector		Terminal
Front LH	B21	3	Ground	7.0 - 8.0 V
Front RH	B28
Rear LH	B26
Rear RH	B41

Is the inspection result normal?

YES >>

GO TO 3.

NO >>

GO TO 2.

CHECK DOOR SWITCH CIRCUIT

Disconnect BCM connector.

Check continuity between door switch harness connector and BCM harness connector.

Door switch			BCM		Continuity
Connector		Terminal	Connector	Terminal	Continuity
Front LH	B21	3	M85	81	Yes
Front RH	B28			93
Rear LH	B26			94
Rear RH	B41			95

Check continuity between door switch harness connector and ground.

Door switch			—	Continuity
Connector		Terminal	—	Continuity
Front LH	B21	3	Ground	No
Front RH	B28
Rear LH	B26
Rear RH	B41

Is the inspection result normal?

YES >>

Replace BCM. Refer to Removal and Installation.

NO >>

Repair or replace harness.

CHECK DOOR SWITCH
1. Refer to Component Inspection.
Is the inspection result normal?
YES >>
GO TO 4.
NO >>
Replace malfunctioning door switch. Refer to Removal and Installation.
CHECK INTERMITTENT INCIDENT
1. Refer to Intermittent Incident.
>>
Inspection End.

Component Inspection

CHECK DOOR SWITCH

Ignition switch OFF.
Disconnect malfunctioning door switch connector.

Check continuity between door switch terminals.

Door switch		Condition		Continuity
Terminal		Condition		Continuity
3	Ground contact is part of the switch.	Door switch	Pressed	No
3	Ground contact is part of the switch.	Door switch	Released	Yes

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Replace malfunctioning door switch. Refer to Removal and Installation.

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