Nissan Sentra B18 (2020-2025) Service Manual / Driver Controls / Interior Lighting System :: Dtc/circuit Diagnosis

Nissan Sentra B18 (2020-2025) Service Manual: Interior Lighting System :: Dtc/circuit Diagnosis

Interior Room Lamp Battery Saver Output Circuit. Diagnosis Procedure

Diagnosis Procedure

CHECK SYMPTOM

Check symptom (A or B).

All the following lamps do not turn ON:

Front room/map lamp assembly lamp
Rear personal lamp
Trunk room lamp
Vanity mirror lamp LH
Vanity mirror lamp RH

Interior room lamp battery saver does not activate.

Which symptom is detected?

A>>

GO TO 2.

B>>

GO TO 6.

CHECK FUSE

Ignition switch OFF.
Check that the following fuses are not blown (open):

Location	Fuse No.	Capacity
Fuse block (J/B)	19	10 A
Fuse block (J/B)	36	10 A

Are the fuses blown (open)?

YES>>

Replace the blown fuse after repairing the affected circuit.

NO>>

GO TO 3.

CHECK ROOM LAMP RELAY CIRCUIT 1

Disconnect room lamp relay connector.

Check voltage between room lamp relay harness connector and ground.

+		-	Voltage (Approx.)
Room lamp relay
Connector	Terminal
J-2	2	Ground	Battery voltage
J-2	3	Ground	Battery voltage

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair or replace harnesses.

CHECK ROOM LAMP RELAY 1
1. Check room lamp relay. Refer to Component Inspection.
Is the inspection result normal?
YES>>
GO TO 5.
NO>>
Replace room lamp relay.

CHECK ROOM LAMP RELAY CIRCUIT 2

Disconnect BCM connector.

Check continuity between room lamp relay harness connector and BCM harness connector.

Room lamp relay		BCM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
J-2	1	M84	37	Yes

Is the inspection result normal?

YES>>

Replace BCM. Refer to Removal and Installation.

NO>>

Repair or replace harnesses.

CHECK ROOM LAMP RELAY 2

Check room lamp relay. Refer to Component Inspection.

Is the inspection result normal?
YES>>
GO TO 7.
NO>>
Replace room lamp relay.

CHECK ROOM LAMP RELAY CIRCUIT 4

Disconnect BCM connector M84.

Check continuity between room lamp relay harness connector and ground.

Room lamp relay		—	Continuity
Connector	Terminal	—	Continuity
J-2	1	Ground	No

Is the inspection result normal?

YES>>

Replace BCM. Refer to Removal and Installation.

NO>>

Repair or replace harnesses.

Component Inspection

CHECK ROOM LAMP RELAY

Ignition switch OFF.
Disconnect room lamp relay connector.
Check continuity between room lamp relay terminals.

Room lamp relay		Condition	Continuity
Terminals		Condition	Continuity
3	5	12 V direct current supply between terminals 1 and 2.	Yes
3	5	No current supply	No

Is the inspection result normal?

YES >>

Inspection End.

NO >>

Replace room lamp relay.

Interior Room Lamp Power Supply Circuit. Component Function Check

Component Function Check

Note:

Before performing the diagnosis, check that the following items are normal:

Interior room lamp battery saver output circuit

CHECK INTERIOR ROOM LAMP CONTROL FUNCTION

CONSULT

Ignition switch ON.
Select “INT LAMP” in "Active Test" mode of "BCM(INT LAMP)".

With operating the test items, check that each interior room lamp turns ON/OFF.

On	: Interior room lamp ON
Off	: Interior room lamp OFF

Does the interior room lamp turns ON/OFF?

YES >>

Interior room lamp power supply circuit is normal.

NO >>

Refer to Diagnosis Procedure.

Diagnosis Procedure

CHECK INTERIOR ROOM LAMP POWER SUPPLY CIRCUIT

Ignition switch OFF.
Disconnect the following connectors:
- Room lamp relay connector.
- Front room/map lamp assembly
- Rear personal lamp
- Trunk room lamp
- Vanity mirror lamp LH
- Vanity mirror lamp RH

Check continuity between room lamp relay harness connector and each interior room lamp harness connector.

Room lamp relay		Interior room lamp			Continuity
Connector	Terminal	Connector		Terminal	Continuity
J-2	5	Front room/map lamp assembly	R3	8	Yes
		Rear personal lamp	R103	1
		Trunk room lamp	B78	1
		Vanity mirror lamp LH	R104	2
		Vanity mirror lamp RH	R105	2

Check continuity between room lamp relay harness connector and ground.

Room lamp relay		—	Continuity
Connector	Terminal	—	Continuity
J-2	5	Ground	No

Is the inspection result normal?

YES >>

GO TO 2.

NO >>

Repair or replace harnesses.

CHECK INTERIOR ROOM LAMP GROUND CIRCUIT

Check continuity between each interior room lamp harness connector and ground.

Interior room lamp			—	Continuity
Connector		Terminal	—	Continuity
Front room/map lamp assembly	R3	7	Ground	Yes
Rear personal lamp	R103	2	Ground	Yes

Is the inspection result normal?

YES>>

Refer to Intermittent Incident.

NO>>

Repair or replace harnesses.

Interior Room Lamp Control Circuit. Component Function Check

Component Function Check

Note:

Before performing the diagnosis, check that the following items are normal:

Interior room lamp power supply circuit
Front room/map lamp assembly bulb
Rear personal lamp bulb

CHECK INTERIOR ROOM LAMP CONTROL FUNCTION

CONSULT

Switch the map lamp switch and room lamp switch to DOOR position.
Ignition switch ON.
Select “INT LAMP” in "Active Test" mode of "BCM(INT LAMP)".

With operating the test items, check that each interior room lamp turns ON/OFF.

On	: Interior room lamp ON
Off	: Interior room lamp OFF

Does the interior room lamp turns ON/OFF?

YES >>

Interior room lamp control circuit is normal.

NO >>

Refer to Diagnosis Procedure.

Diagnosis Procedure

CHECK INTERIOR ROOM LAMP CONTROL CIRCUIT

Ignition switch OFF.
Disconnect following connectors:
- Front room/map lamp assembly
- Rear personal lamp
Ignition switch ON.
Check continuity between BCM harness connector and the ground.

BCM		—	Condition		Continuity
Connector	Terminal	—	Condition		Continuity
M20	130	Ground	Front door LH	Open	Yes
M20	130	Ground	Front door LH	Close	No

Is the inspection result normal?

YES >>

GO TO 2.

NO>>

Continuity exists and remains unchanged: GO TO 3.

NO>>

Continuity does not exist and remains unchanged: Replace BCM. Refer to Removal and Installation.

CHECK INTERIOR ROOM LAMP CONTROL CIRCUIT

Ignition switch OFF.
Disconnect BCM connector.

Check continuity between BCM harness connector and front room/map lamp assembly harness connector.

BCM		Front room/map lamp assembly		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M20	130	R3	5	Yes

Check continuity between front room/map lamp assembly harness connector and rear personal lamp harness connector.

Front room/map lamp assembly		Rear personal lamp		Continuity
Connector	Terminal	Connector	Terminal	Continuity
R3	1	R103	3	Yes

Is the inspection result normal?

YES >>

Front room/map lamp assembly: Replace front room/map lamp assembly. Refer to Removal and Installation.

YES >>

Rear personal lamp: Replace corresponding rear personal lamp. The rear personal lamp is serviced as part of an assembly to the headlining. Refer to Removal and Installation.

NO >>

Repair or replace harnesses.

CHECK INTERIOR ROOM LAMP SHORT CIRCUIT

Ignition switch OFF.
Disconnect BCM connector.

Check continuity between BCM harness connector and the ground.

BCM		—	Continuity
Connector	Terminal	—	Continuity
M20	130	Ground	No

Check continuity between front room/map lamp assembly harness connector and ground.

Front room/map lamp		—	Continuity
Connector	Terminal	—	Continuity
R3	1	Ground	No

Is the inspection result normal?

YES >>

Replace BCM. Refer to Removal and Installation.

NO >>

Repair or replace harnesses.

Trunk Room Lamp Circuit. Component Function Check

Component Function Check

CAUTION:

Before performing the diagnosis, check that the following are normal:

Interior room lamp power supply circuit

Trunk room lamp bulb

CHECK TRUNK ROOM LAMP OPERATION

CONSULT

Ignition switch ON.
Select “Trunk/luggage lamp” in "Active Test" mode of "BCM(TRUNK)".

With operating the test items, check that trunk room lamp turns ON/OFF.

On	: Trunk room lamp ON
Off	: Trunk room lamp OFF

Does the Trunk room lamp turn ON/OFF?

YES >>

Trunk room lamp circuit is normal.

NO >>

Refer to Diagnosis Procedure.

Diagnosis Procedure

CHECK TRUNK ROOM LAMP OUTPUT

CONSULT

Ignition switch OFF.
Disconnect trunk room lamp connector.
Ignition switch ON.
Select “Trunk/luggage lamp” in "Active Test" mode of "BCM(TRUNK)".
With operating the test item, check continuity between BCM harness connector and the ground.

BCM		—	Test item		Continuity
Connector	Terminal	—	Test item		Continuity
M84	30	Ground	Trunk/luggage lamp	On	Yes
M84	30	Ground	Trunk/luggage lamp	Off	No

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Continuity exists and remains unchanged: GO TO 3.

NO>>

Continuity does not exist and remains unchanged: Replace BCM. Refer to Removal and Installation.

CHECK TRUNK ROOM LAMP OPEN CIRCUIT 1

Ignition switch OFF.
Disconnect BCM connector.
Check continuity between BCM harness connector and trunk room lamp harness connector.

BCM		Trunk room lamp		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M84	30	B78	2	Yes

Is the inspection result normal?

YES >>

Replace trunk room lamp bulb. Refer to Bulb Replacement.

NO >>

Repair or replace harnesses.

CHECK TRUNK ROOM LAMP SHORT CIRCUIT

Ignition switch OFF.
Disconnect BCM connector.
Check continuity between BCM harness connector and the ground.

BCM		—	Continuity
Connector	Terminal	—	Continuity
M84	30	Ground	No

Is the inspection result normal?

YES >>

Replace BCM. Refer to Removal and Installation.

NO >>

Repair or replace harnesses.

Push-Button Ignition Switch Illumination Circuit. Component Function Check

Component Function Check

CHECK PUSH-BUTTON IGNITION SWITCH ILLUMINATION OPERATION
1. Check that the push-button ignition switch illumination turns ON/OFF in all of the conditions. Refer to System Description.
Is the inspection result normal?
YES >>
Push-button ignition switch illumination circuit is normal.
NO >>
Refer to Diagnosis Procedure.

Diagnosis Procedure

CHECK PUSH-BUTTON IGNITION SWITCH ILLUMINATION OUTPUT

Ignition switch OFF.
Check voltage between push-button ignition switch harness connector and ground.

Push-button ignition switch	—	Condition	Voltage (Approx.)
M25	5	Ground	Push-button ignition switch illumination	OFF	0 V
ON	Battery voltage

Push-button ignition switch

—

Condition

Voltage

(Approx.)

Connector

Terminal

M25

Ground

Push-button ignition switch illumination

OFF

0 V

Battery voltage

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

GO TO 2.

CHECK PUSH-BUTTON IGNITION SWITCH ILLUMINATION CIRCUIT 1

Disconnect Intelligent Key unit connector and push-button ignition switch connector.

Check continuity between Intelligent Key unit harness connector and push-button ignition switch harness connector.

Intelligent Key unit		Push-button ignition switch		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M155	10	M25	5	Yes

Is the inspection result normal?

YES >>

GO TO 3.

NO >>

Repair or replace harnesses.

CHECK PUSH-BUTTON IGNITION SWITCH ILLUMINATION CIRCUIT 2

Check continuity between Intelligent Key unit harness connector and ground.

Intelligent Key unit		—	Continuity
Connector	Terminal	—	Continuity
M155	10	Ground	No

Is the inspection result normal?

YES >>

Replace Intelligent Key unit. Refer to Removal and Installation.

NO >>

Repair or replace harnesses.

CHECK PUSH-BUTTON IGNITION SWITCH ILLUMINATION GROUND CIRCUIT

Disconnect push-button ignition switch connector.

Check continuity between push-button ignition switch harness connector and ground.

Push-button ignition switch		—	Continuity
Connector	Terminal	—	Continuity
M25	6	Ground	Yes

Is the inspection result normal?

YES >>

Replace push-button ignition switch. Refer to Removal and Installation.

NO >>

Repair or replace harnesses.

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