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

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

Component Function Check

Component Function Check

CHECK STOP LAMP OPERATION

Ignition switch ON.

With operating the brake pedal, check that the stop lamp and high-mounted stop lamp is turned ON.

Depressed	: Stop lamp and high-mounted stop lamp ON
Fully released	: Stop lamp and high-mounted stop lamp OFF

Is the inspection result normal?

YES >>

Stop lamp circuit is normal.

NO >>

Refer to Diagnosis Procedure.

Diagnosis Procedure

Diagnosis Procedure

CHECK SYMPTOM

Check symptom (A or B).

Symptom
A	Both stop lamps and the high-mounted stop lamp will not turn ON
B	Any of the stop lamps and the high-mounted stop lamp will not turn ON

Which symptom is detected?

A>>

GO TO 2.

B>>

GO TO 8.

CHECK FUSE

Ignition switch OFF.

Check if the following fuse is not blown:

Signal name	Location	Fuse No.	Capacity
Battery power supply (stop lamp) Battery power supply (stop lamp switch)	Fuse block (J/B)	34	10 A

Is the fuse blown (open)?

YES >>

Replace the blown fuse after repairing the affected circuit.

NO >>

GO TO 3.

CHECK BATTERY POWER SUPPLY (STOP LAMP)

Disconnect BCM connector.

Check voltage between BCM harness connector and ground.

+	-	Voltage (Approx.)
M20	139	Ground	Battery voltage

Voltage

(Approx.)

BCM

Connector

Terminal

M20

139

Ground

Battery voltage

Is the inspection result normal?

YES >>

GO TO 4.

NO >>

Repair or replace harness.

CHECK STOP LAMP SWITCH POWER SUPPLY

Check voltage between stop lamp switch harness connector and ground.

+	-	Voltage (Approx.)
E60	1	Ground	Battery voltage

Voltage

(Approx.)

Stop lamp switch

Connector

Terminal

E60

Ground

Battery voltage

YES >>

GO TO 5.

NO >>

Repair or replace harness.

CHECK STOP LAMP SWITCH SIGNAL

With operating the brake pedal, check voltage between BCM harness connector and ground.

+		-	Condition		Voltage (Approx.)
BCM
Connector	Terminal
M142	110	Ground	Ignition switch OFF	Brake pedal is released	0V
M142	110	Ground	Ignition switch OFF	Brake pedal is depressed	Battery voltage

Is the inspection result normal?

YES >>

Replace BCM. Refer to Removal and Installation.

NO >>

GO TO 6.

CHECK STOP LAMP SWITCH
1. Check stop lamp switch. Refer to Component Inspection.
Is the inspection result normal?
YES >>
GO TO 7.
NO >>
Repair or replace the malfunctioning part.

CHECK STOP LAMP SWITCH CIRCUIT (OPEN)

Disconnect following connectors:
- BCM
- Stop lamp switch

Check continuity between BCM harness connector and stop lamp switch harness connector.

BCM		Stop lamp switch		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M142	110	E60	2	Yes

Is the inspection result normal?

YES >>

Check intermittent incident. Refer to Intermittent Incident.

NO >>

Repair or replace harness.

CHECK STOP LAMP
1. Check the stop lamp. Refer to Component Inspection.
Is the inspection result normal?
YES>>
GO TO 9.
NO>>
Repair or replace the malfunctioning part.

CHECK STOP LAMP / HIGH-MOUNTED STOP LAMP OUTPUT VOLTAGE

CONSULT

Ignition switch ON.
Select “STOP LAMP 1” or “STOP LAMP 2” in “Active Test” mode of "BCM(HEAD LAMP)".

With operating the test items, check voltage between BCM harness connector and ground.

Stop lamp RH
+		-	Test item		Voltage (Approx.)
BCM
Connector	Terminal
M21	157	Ground	STOP LAMP 1	On	Battery voltage
M21	157	Ground	STOP LAMP 1	Off	0V

Stop lamp LH and high-mounted stop lamp
+		-	Test item		Voltage (Approx.)
BCM
Connector	Terminal
M21	160	Ground	STOP LAMP 2	On	Battery voltage
M21	160	Ground	STOP LAMP 2	Off	0V

Is the inspection result normal?

YES >>

GO TO 11.

NO >>

GO TO 10.

CHECK STOP LAMP / HIGH-MOUNTED STOP LAMP POWER SUPPLY CIRCUIT (SHORT)

Ignition switch OFF.
Disconnect following connectors:
- BCM
- Rear combination lamp LH (body side)
- Rear combination lamp RH (body side)
- High-mounted stop lamp

Check continuity between BCM harness connector and ground.

Stop lamp RH
BCM		—	Continuity
Connector	Terminal	—	Continuity
M21	157	Ground	No

Stop lamp LH and high-mounted stop lamp
BCM		—	Continuity
Connector	Terminal	—	Continuity
M21	160	Ground	No

Is the inspection result normal?

YES >>

Replace BCM. Refer to Removal and Installation.

NO >>

Repair or replace harness.

CHECK STOP LAMP / HIGH-MOUNTED STOP LAMP POWER SUPPLY CIRCUIT (OPEN)

Ignition switch OFF.
Disconnect following connectors:
- BCM
- Rear combination lamp LH (body side)
- Rear combination lamp RH (body side)
- High-mounted stop lamp

Check continuity between BCM harness connector and each stop lamp harness connector.

Stop lamp
BCM			Rear combination lamp (body side)		Continuity
Connector		Terminal	Connector	Terminal	Continuity
RH	M21	157	B42	3	Yes
LH	M21	160	B25	3	Yes

High-mounted stop lamp
BCM		High-mounted stop lamp		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M21	160	B74	1	Yes

Is the inspection result normal?

YES>>

GO TO 12.

NO>>

Repair or replace harness.

CHECK STOP LAMP / HIGH-MOUNTED STOP LAMP GROUND CIRCUIT

Check continuity between each stop lamp harness connector and ground.

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

High-mounted stop lamp
High-mounted stop lamp		—	Continuity
Connector	Terminal	—	Continuity
B74	2	Ground	Yes

Is the inspection result normal?

YES >>

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

YES >>

High-mounted stop lamp: Replace the high-mounted stop lamp. Refer to Removal and Installation.

NO >>

Repair or replace harness.

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