Nissan Sentra B18 (2020-2025) Service Manual: Diagnosis Procedure

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

Component Function Check CHECK FUNCTION CONSULT Select "Door switch AS", "Door switch DR", "Door switc ...

Component Inspection

Component Inspection CHECK DOOR SWITCH Ignition switch OFF. Disconnect malfunctioning door s ...

Other materials:

Operation
I-Fcw 4.2 Inch Information Display Operation Switch Name and Function No. Switch name Description ...

Wiring diagram
Tire pressure monitoring system With intelligent key WITH INTELLIGENT KEY : Wiring Diagram Without intelligent key WITHOUT INTELLIGENT KEY : Wiring Diagram ...

Instrument panel
This instrument panel overview helps Nissan Sentra drivers quickly identify switches, displays, and controls essential for safe vehicle operation. Headlight/turn signal switch Steering wheel switch Audio controls Driver's supplemental air bag Horn Meters and gauges Warning ...