Nissan Sentra B18 (2020-2025) Service Manual / Body Exterior, Doors, Roof & Vehicle Security / Security Control System :: Intelligent Key System / Dtc/circuit Diagnosis / B2f70-01 Stop Lamp

Nissan Sentra B18 (2020-2025) Service Manual: B2f70-01 Stop Lamp

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC detecting condition
B2F70-01	Stop lamp (Stop lamp)	Diagnosis condition	When brake pedal is depressed
		Signal (terminal)	Brake pedal position switch signal Stop lamp switch signal
		Threshold	BCM makes a comparison between the brake pedal position switch signal and stop lamp switch signal. It judges from their values to detect the malfunctioning circuit 10 consecutive times.
		Diagnosis delay time	10 times

POSSIBLE CAUSE

Harness or connectors

(Brake pedal position switch circuit is open or shorted)
Brake pedal position switch
Fuse
Stop lamp switch

FAIL-SAFE

—

Confirmation Procedure

Confirmation Procedure

PERFORM DTC CONFIRMATION PROCEDURE
1. CONSULT
  1. Depress brake pedal 10 times.
  2. Ignition switch ON.
  3. Select “Self Diagnostic Result” mode of “BCM”.
Is DTC detected?
YES >>
Refer to DTC Diagnosis Procedure.
NO >>
To check malfunction symptom before repair: Refer to Intermittent Incident.
NO >>
Confirmation after repair: Inspection End.

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

CHECK BRAKE PEDAL POSITION SWITCH AND STOP LAMP SWITCH

CONSULT

Select “Brake switch 1” and “Brake switch 2” in “Data Monitor” mode of “BCM(SIGNAL BUFFER)”.
Check “Brake switch 1” and “Brake switch 2” indication under the following condition.

Monitor item	Condition		Indication
Brake switch 1	Brake pedal	Depressed	Off
Brake switch 1		Not depressed	On
Brake switch 2		Depressed	On
Brake switch 2		Not depressed	Off

Is the indication normal?

YES >>

Brake pedal position switch and stop lamp switch is OK.

NO >>

Brake pedal position switch: GO TO 2.

NO >>

Stop lamp switch: GO TO 7.

CHECK FUSE

Check that the following fuse is not blown (open):

Signal name	Fuse No.	Capacity
Ignition power supply	3	10 A

Is the fuse blown (open)?

YES >>

Replace the blown (open) fuse after replacing the cause of blown (open).

NO >>

GO TO 3.

CHECK BRAKE PEDAL POSITION SWITCH SIGNAL

Ignition switch OFF.
Disconnect BCM connector.
Ignition switch ON.

Check voltage between BCM harness connector and ground.

(+)		(–)	Condition	Voltage (Approx.)
BCM
Connector	Terminal
M142	111	Ground	Brake pedal is not depressed	Battery voltage
M142	111	Ground	Brake pedal is depressed	0 V

Is the inspection normal?

YES >>

Inspection End.

NO >>

GO TO 4.

CHECK BRAKE PEDAL POSITION SWITCH POWER SUPPLY CIRCUIT

Ignition switch OFF.
Disconnect brake pedal position switch connector.
Ignition switch ON.

Check voltage between brake pedal position switch harness connector and ground.

(+)	(–)	Voltage (Approx.)
E84	1	Ground	Battery voltage

(+)

(–)

Voltage

(Approx.)

Brake pedal position switch

Connector

Terminal

E84

Ground

Battery voltage

Is the inspection result normal?

YES >>

GO TO 5.

NO >>

Check harness for open or short between brake pedal position switch and fuse.

CHECK BRAKE PEDAL POSITION SWITCH SIGNAL CIRCUIT

Ignition switch OFF.

Check continuity between brake pedal position switch harness connector and BCM harness connector.

Brake pedal position switch		BCM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
E84	2	M142	111	Yes

Check continuity between brake pedal position switch harness connector and ground.

Brake pedal position switch		—	Continuity
Connector	Terminal	—	Continuity
E84	2	Ground	No

Is the inspection result normal?

YES >>

GO TO 6.

NO >>

Repair or replace harness.

CHECK BRAKE PEDAL POSITION SWITCH
1. Refer to Component Inspection.
Is the inspection result normal?
YES >>
Inspection End.
NO >>
Replace brake pedal position switch. Refer to Exploded View.

CHECK FUSE

Check that the following fuse is not blown (open):

Signal name	Fuse No.	Capacity
Battery power supply	34	10 A

Is the fuse blown (open)?

YES >>

Replace the blown (open) fuse after replacing the cause of blown (open).

NO >>

GO TO 8.

CHECK STOP LAMP SWITCH SIGNAL

Ignition switch OFF.
Disconnect BCM connector.

Check voltage between BCM harness connector and ground.

(+)		(–)	Condition	Voltage (Approx.)
BCM
Connector	Terminal
M142	110	Ground	Brake pedal is depressed	Battery voltage
M142	110	Ground	Brake pedal is not depressed	0 V

Is the inspection normal?

YES >>

Inspection End.

NO >>

GO TO 9.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

Disconnect stop lamp switch connector.
Ignition switch ON.

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

Is the inspection result normal?

YES >>

GO TO 10.

NO >>

Check harness for open or short between stop lamp switch and fuse.

CHECK STOP LAMP SWITCH SIGNAL CIRCUIT

Ignition switch OFF.

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

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

Check continuity between stop lamp switch harness connector and ground.

Stop lamp switch		—	Continuity
Connector	Terminal	—	Continuity
E60	2	Ground	No

Is the inspection result normal?

YES>>

GO TO 11.

NO>>

Repair or replace harness.

CHECK STOP LAMP SWITCH
1. Refer to Component Inspection.
Is the inspection result normal?
YES >>
Inspection End.
NO >>
Replace stop lamp switch. Refer to Exploded View.

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