Nissan Sentra B18 (2020-2025) Service Manual / Driver Controls / Exterior Lighting System :: Led Headlamp / Dtc/circuit Diagnosis / Turn Signal Lamp Circuit

Nissan Sentra B18 (2020-2025) Service Manual: Turn Signal Lamp Circuit

Component Function Check

Component Function Check

CHECK TURN SIGNAL LAMP OPERATION

CONSULT

Select “FLASHER” in "Active Test" mode of “BCM(FLASHER)".

With operating the test item, check that the turn signal lamp is blinks.

RH	: Turn signal lamp RH blink
LH	: Turn signal lamp LH blink
LH/RH	: Turn signal lamps LH and RH blink

Is the inspection result normal?

YES >>

Turn signal lamp circuit is normal.

NO >>

Refer to Diagnosis Procedure.

Diagnosis Procedure

Diagnosis Procedure

CHECK TURN SIGNAL LAMP BULB
1. Check the turn signal lamp bulb. Refer to Component Inspection.
Is the inspection result normal?
YES >>
GO TO 2.
NO >>
Front turn signal lamp: Replace corresponding front combination lamp bulb. Refer to Bulb Replacement.
NO >>
Rear turn signal lamp: Replace corresponding rear combination lamp (body side) bulb. Refer to Bulb Replacement.
NO >>
Side turn signal lamp: Replace corresponding door mirror turn signal lamp. Refer to Removal and Installation.

CHECK SYMPTOM

Check symptom (A or B).

Symptom
A	All of turn signal lamp do not blink
B	Applicable side performs high flasher activation

Which symptom is detected?

A>>

GO TO 3.

B>>

GO TO 5.

CHECK FUSE

Ignition switch OFF.

Check if the following BCM fuses are blown:

Component	Location	Fuse No.	Capacity
BCM	Fuse block (J/B)	41	5 A
BCM	Fuse block (J/B)	32	10 A

Is the fuse blown (open)?

YES >>

Replace the blown fuse after repairing the affected circuit.

NO >>

GO TO 4.

CHECK BCM POWER SUPPLY (TURN SIGNAL LAMP)

Disconnect BCM connector.

Check voltage between BCM harness connector and ground.

+		-	Voltage (Approx.)
BCM
Connector	Terminal
M84	7	Ground	Battery voltage
M20	133	Ground	Battery voltage

Is the inspection result normal?

YES >>

Replace BCM. Refer to Removal and Installation.

NO >>

Repair or replace harness.

CHECK TURN SIGNAL LAMP OUTPUT VOLTAGE

Ignition switch OFF.
Disconnect the following connectors:
- Front combination lamp LH
- Front combination lamp RH
- Door mirror LH
- Door mirror RH
- Rear combination lamp LH (body side)
- Rear combination lamp RH (body side)
Ignition switch ON.

With operating the turn signal switch, check voltage between BCM harness connector and ground.

Front turn signal lamp
+			-	Condition		Voltage (Approx.)
BCM
Connector		Terminal
RH	M142	116	Ground	Turn signal switch	Right	Blinking : Battery voltage
RH		116			Center	0V
LH		128			Left	Blinking : Battery voltage
LH		128			Center	0V

Side turn signal lamp
+			-	Condition		Voltage (Approx.)
BCM
Connector		Terminal
RH	M84	1	Ground	Turn signal switch	Right	Blinking : Battery voltage
RH		1			Center	0V
LH		21			Left	Blinking : Battery voltage
LH		21			Center	0V

Rear turn signal lamp
+			-	Condition		Voltage (Approx.)
BCM
Connector		Terminal
RH	M21	159	Ground	Turn signal switch	Right	Blinking : Battery voltage
RH		159			Center	0V
LH		151			Left	Blinking : Battery voltage
LH		151			Center	0V

Is the inspection result normal?

YES >>

GO TO 7.

NO >>

GO TO 6.

CHECK TURN SIGNAL LAMP POWER SUPPLY CIRCUIT (SHORT)

Ignition switch OFF.
Disconnect BCM connector.

Check continuity between BCM harness connector and ground.

Front turn signal lamp
BCM			—	Continuity
Connector		Terminal	—	Continuity
RH	M142	116	Ground	No
LH	M142	128	Ground	No

Side turn signal lamp
BCM			—	Continuity
Connector		Terminal	—	Continuity
RH	M84	1	Ground	No
LH	M84	21	Ground	No

Rear turn signal lamp
BCM			—	Continuity
Connector		Terminal	—	Continuity
RH	M21	159	Ground	No
LH	M21	151	Ground	No

Is the inspection result normal?

YES >>

Replace BCM. Refer to Removal and Installation.

NO >>

Repair or replace harness.

CHECK TURN SIGNAL LAMP POWER SUPPLY CIRCUIT (OPEN)

Ignition switch OFF.
Disconnect BCM connector.

Check continuity between BCM harness connector and each turn signal lamp harness connector.

Front turn signal lamp
BCM			Front combination lamp		Continuity
Connector		Terminal	Connector	Terminal	Continuity
RH	M142	116	E38	2	Yes
LH	M142	128	E37	2	Yes

Side turn signal lamp (with Intelligent Around View® Monitor)
BCM			Door mirror		Continuity
Connector		Terminal	Connector	Terminal	Continuity
RH	M84	1	D106	11	Yes
LH	M84	21	D7	11	Yes

Side turn signal lamp (with Intelligent Around View® Monitor)
BCM			Door mirror		Continuity
Connector		Terminal	Connector	Terminal	Continuity
RH	M84	1	D113	1	Yes
LH	M84	21	D4	1	Yes

Rear turn signal lamp
BCM			Rear combination lamp (body side)		Continuity
Connector		Terminal	Connector	Terminal	Continuity
RH	M21	159	B42	1	Yes
LH	M21	151	B25	1	Yes

Is the inspection result normal?

YES >>

GO TO 8.

NO >>

Repair or replace harness.

CHECK TURN SIGNAL LAMP GROUND CIRCUIT

Check continuity between each turn signal lamp harness connector and ground.

Front turn signal lamp
Front combination lamp			—	Continuity
Connector		Terminal	—	Continuity
RH	E38	1	Ground	Yes
LH	E37	1	Ground	Yes

Side turn signal lamp (with Intelligent Around View® Monitor)
Door mirror			—	Continuity
Connector		Terminal	—	Continuity
RH	D106	12	Ground	Yes
LH	D7	12	Ground	Yes

Side turn signal lamp (without Intelligent Around View® Monitor)
Door mirror			—	Continuity
Connector		Terminal	—	Continuity
RH	D113	5	Ground	Yes
LH	D4	5	Ground	Yes

Rear turn signal lamp
Rear combination lamp (body side)			—	Continuity
Connector		Terminal	—	Continuity
RH	B42	4	Ground	Yes
LH	B25	4	Ground	Yes

Is the inspection result normal?

YES >>

Front turn signal lamp: Replace corresponding front combination lamp bulb. Refer to Bulb Replacement.

YES >>

Rear turn signal lamp: Replace corresponding rear combination lamp (body side) bulb. Refer to Bulb Replacement.

YES >>

Side turn signal lamp: Replace corresponding door mirror turn signal lamp. Refer to Removal and Installation.

NO >>

Repair or replace harness.

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