Nissan Sentra B18 (2020-2025) Service Manual: B2fac-12 Accessory Relay

Nissan Sentra B18 (2020-2025) Service Manual / Electrical & Power Control / Power Control System :: Power Distribution System / Dtc/circuit Diagnosis / B2fac-12 Accessory Relay

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC detection condition
B2FAC-12	Accessory relay (Accessory relay)	Diagnosis condition	When ignition switch is ON
		Signal (terminal)	Accessory relay-1 control signal (terminal #34)
		Threshold	16 V or more
		Diagnosis delay time	1 second or more

POSSIBLE CAUSE

Harness or connectors (accessory relay-1 control signal circuit is shorted to battery)
Accessory relay-1
BCM

FAIL-SAFE

—

Dtc Confirmation Procedure

DTC Confirmation Procedure

PERFORM DTC CONFIRMATION PROCEDURE
1. CONSULT
  1. Ignition switch ON.
  2. Ignition switch OFF and wait for 1 minute with the front door LH opened.
  3. Ignition switch ON.
  4. 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 ACCESSORY RELAY-1 CONTROL SIGNAL CIRCUIT (SHORT TO BATTERY)

Ignition switch OFF.
Disconnect accessory relay-1 connector and BCM connector.

Check voltage between BCM harness connector and ground.

+	-	Voltage (Approx.)
M84	34	Ground	0 V

Voltage

(Approx.)

BCM

Connector

Terminal

M84

Ground

0 V

Is the inspection result normal?

YES >>

GO TO 2.

NO >>

Repair or replace harness

CHECK ACCESSORY RELAY-1
1. Check accessory relay-1. Refer to Component Inspection.
Is the inspection result normal?
YES>>
Replace BCM. Refer to Removal and Installation.
NO>>
Replace accessory relay-1.

B2fac-14 Accessory Relay

Dtc Description DTC Description DTC DETECTION LOGIC DTC No. CONSULT screen items (Tro ...

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