Nissan Sentra B18 (2020-2025) Service Manual / Body Exterior, Doors, Roof & Vehicle Security / Security Control System :: Intelligent Key System / Dtc/circuit Diagnosis / B2c20-12 Starter Cut Relay

Nissan Sentra B18 (2020-2025) Service Manual: B2c20-12 Starter Cut Relay

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC detecting condition
B2C20-12	Starter cut relay (Starter cut relay)	Diagnosis condition	Ignition switch ON
		Signal (terminal)	Starter cut relay signal
		Threshold	When BCM detects starter cut relay circuit is short to battery
		Diagnosis delay time	1 second or less

POSSIBLE CAUSE

Harness or connectors

(Starter cut relay circuit is short to battery)
Starter cut relay

FAIL-SAFE

—

Confirmation Procedure

Confirmation Procedure

PERFORM DTC CONFIRMATION PROCEDURE
1. 1. Ignition switch ON under the following conditions and wait 1 second or more:
    - CVT models
      - Selector lever: In the P position.
      - Brake pedal: Depressed.
    - M/T models
      - Shift lever: In the neutral position.
      - Clutch pedal or Brake pedal: Depressed.
  2. CONSULT
    
    Select “Self Diagnostic Result” mode of “BCM”.
Is the 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 STARTER CUT RELAY INPUT SIGNAL

Check voltage between BCM harness connector and ground.

(+)		(-)	Condition	Voltage (Approx.)
BCM
Connector	Terminal
M142	123	Ground	At engine cranking	0 V
M142	123	Ground	Other than above	Battery voltage

Is the inspection result normal?

YES >>

Inspection End.

NO >>

GO TO 2.

CHECK STARTER CUT RELAY INPUT SIGNAL CIRCUIT

Ignition switch OFF.
Disconnect BCM connector and starter cut relay connector.

Check continuity between BCM harness connector and starter cut relay harness connector.

BCM		Starter cut relay		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M142	123	H-2	2	Yes

Check continuity between BCM harness connector and ground.

BCM		—	Continuity
Connector	Terminal	—	Continuity
M142	123	Ground	No

Is the inspection result normal?

YES >>

GO TO 3.

NO >>

Repair or replace harness.

CHECK STARTER CUT RELAY
1. Check starter cut relay. Refer to Component Inspection.
Is the inspection result normal?
YES >>
Inspection End.
NO >>
Replace starter cut relay.

 Dtc/circuit Diagnosis

 B2c20-23 Starter Cut Relay

Dtc Description DTC Description DTC DETECTION LOGIC DTC No. CONSULT screen items (Trouble diagnosis content) DTC detecting condition B2C20-23 Starter cut relay (Starter cut rela...

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