Nissan Pathfinder: Power Control System - Dtc/circuit Diagnosis

• B2fac-12 Accessory Relay
• B2fac-14 Accessory Relay
• B2fae-12 Ignition Relay-1
• B2fae-14 Ignition Relay-1
• Push-Button Ignition Switch Circuit
• Accessory Relay
• Ignition Relay-1
• Power Supply and Ground Circuit

B2fac-12 Accessory Relay Nissan Pathfinder 2025

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 control signal (terminal #34)
		Threshold	16 V or more
		Diagnosis delay time	1 second or more

POSSIBLE CAUSE

• Harness or connectors (accessory relay control signal circuit is shorted to battery)

• Accessory relay

• BCM

FAIL-SAFE

—

DTC Confirmation Procedure

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait for 1 minute with the front LH door 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

CHECK ACCESSORY RELAY CONTROL SIGNAL CIRCUIT (SHORT TO BATTERY)

1. Ignition switch OFF.

2. Disconnect accessory relay connector.

3. Disconnect BCM connector.

4. Check voltage between BCM harness connector and ground.

   +		-	Voltage (Approx.)
   BCM
   Connector	Terminal
   M18	34	Ground	0 V

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Repair or replace harness

CHECK ACCESSORY RELAY

Check accessory relay. Refer to Component Inspection.

Is the inspection result normal?

YES>>

Replace BCM. Refer to Removal and Installation.

NO>>

Replace accessory relay.

B2fac-14 Accessory Relay Nissan Pathfinder R53

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC detection condition
B2FAC-14	Accessory relay (Accessory relay)	Diagnosis condition	When ignition switch is OFF (not auto ACC status)
		Signal (terminal)	Accessory relay control signal (terminal #34)
		Threshold	0 V
		Diagnosis delay time	1 second or more

POSSIBLE CAUSE

• Harness or connectors (accessory relay control signal circuit is shorted to ground or open)

• Accessory relay

• BCM

FAIL-SAFE

—

DTC Confirmation Procedure

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait for 1 minute with the front LH door 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

CHECK ACCESSORY RELAY CONTROL SIGNAL VOLTAGE

1. Ignition switch OFF.

2. Disconnect BCM connector.

3. Check voltage between BCM harness connector and ground.

   +		-	Voltage (Approx.)
   BCM
   Connector	Terminal
   M18	34	Ground	Battery voltage

Is the inspection result normal?

YES>>

Replace BCM. Refer to Removal and Installation.

NO>>

GO TO 2.

CHECK ACCESSORY RELAY CONTROL SIGNAL CIRCUIT (OPEN)

1. Disconnect accessory relay connector.

2. Check continuity between BCM harness connector and accessory relay harness connector.

   BCM		Accessory relay		Continuity
   Connector	Terminal	Connector	Terminal
   M18	34	J-d	1	Yes

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair or replace harness.

CHECK ACCESSORY RELAY CONTROL SIGNAL CIRCUIT (SHORT TO GROUND)

Check continuity between BCM harness connector and ground.

BCM		—	Continuity
Connector	Terminal
M18	34	Ground	No

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair or replace harness.

CHECK ACCESSORY RELAY

Check accessory relay. Refer to Component Inspection.

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Replace accessory relay.

B2fae-12 Ignition Relay-1 Nissan Pathfinder R53

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC detection condition
B2FAE-12	Ignition relay-1 (Ignition relay-1)	Diagnosis condition	When ignition switch is ON
		Signal (terminal)	Ignition relay-1 [fuse block (J/B)] control signal (terminal #105)
		Threshold	16 V or more
		Diagnosis delay time	1 second or more

POSSIBLE CAUSE

• Harness or connectors {ignition relay-1 [fuse block (J/B)] control signal circuit is shorted to battery}

• Ignition relay-1

• BCM

FAIL-SAFE

Inhibit engine cranking

DTC Confirmation Procedure

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait for 1 second or more.

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

CHECK IGNITION RELAY-1 [FUSE BLOCK (J/B)] CONTROL SIGNAL CIRCUIT (SHORT TO BATTERY)

1. Ignition switch OFF.

2. Disconnect BCM connector and ignition relay-1 connector.

3. Check voltage between BCM harness connector and ground.

   +		-	Voltage (Approx.)
   BCM
   Connector	Terminal
   M80	105	Ground	0 V

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Repair or replace harness.

CHECK IGNITION RELAY-1

Check ignition relay-1. Refer to Component Inspection.

Is the inspection result normal?

YES>>

Replace BCM. Refer to Removal and Installation.

NO>>

Replace ignition relay-1.

B2fae-14 Ignition Relay-1 Nissan Pathfinder 2022

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC detection condition
B2FAE-14	Ignition relay-1 (Ignition relay-1)	Diagnosis condition	When ignition switch is OFF
		Signal (terminal)	Ignition relay-1 [fuse block (J/B)] control signal (terminal #105)
		Threshold	0 V
		Diagnosis delay time	1 second or more

POSSIBLE CAUSE

• Harness or connectors {ignition relay-1 [fuse block (J/B)] control signal circuit is shorted to ground or open}

• Ignition relay-1

• BCM

FAIL-SAFE

Inhibit engine cranking

DTC Confirmation Procedure

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait for 1 second or more.

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

CHECK IGNITION RELAY-1 [FUSE BLOCK (J/B)] CONTROL SIGNAL VOLTAGE

1. Ignition switch OFF.

2. Disconnect BCM connector.

3. Check voltage between BCM harness connector and ground.

   +		-	Voltage (Approx.)
   BCM
   Connector	Terminal
   M80	105	Ground	Battery voltage

Is the inspection result normal?

YES>>

Replace BCM. Refer to Removal and Installation.

NO>>

GO TO 2.

CHECK IGNITION RELAY-1 [FUSE BLOCK (J/B)] CONTROL SIGNAL CIRCUIT (OPEN)

1. Disconnect ignition relay-1 connector.

2. Check continuity between BCM harness connector and ignition relay-1 harness connector.

   BCM		Ignition relay-1		Continuity
   Connector	Terminal	Connector	Terminal
   M80	105	J-d	2	Yes

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair or replace harness.

CHECK IGNITION RELAY-1 [FUSE BLOCK (J/B)] CONTROL SIGNAL CIRCUIT (SHORT TO GROUND)

Check continuity between BCM harness connector and ground.

BCM		—	Continuity
Connector	Terminal
M80	105	Ground	No

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair or replace harness.

CHECK IGNITION RELAY-1

Check ignition relay-1. Refer to Component Inspection.

Is the inspection result normal?

YES>>

Inspection End

NO>>

Replace ignition relay-1.

Push-Button Ignition Switch Circuit Nissan Pathfinder SUV

Component Function Check

CHECK FUNCTION

CONSULT

1. Ignition switch ON

2. Select “Push SW” in “Data Monitor” mode of “HANDS FREE MODULE”.

3. Check the push-button ignition switch signal under the following conditions:

Test item	Condition	Status
Push SW	Push-button ignition switch is pressed	On
	Push-button ignition switch is not pressed	Off

Is the indication normal?

YES>>

Inspection End.

NO>>

Refer to Diagnosis Procedure.

Diagnosis Procedure

CHECK PUSH-BUTTON IGNITION SWITCH SIGNAL OUTPUT VOLTAGE

1. Ignition switch OFF.

2. Disconnect push-button ignition switch connector.

3. Check voltage between push-button ignition switch harness connector and ground.

   +		-	Voltage (Approx.)
   Push-button ignition switch
   Connector	Terminal
   M17	8	Ground	Battery voltage

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

GO TO 2.

CHECK PUSH-BUTTON IGNITION SWITCH SIGNAL CIRCUIT (OPEN)

1. Disconnect Intelligent Key unit connector.

2. Check continuity between push-button ignition switch harness connector and Intelligent Key unit harness connector.

   Push-button ignition switch		Intelligent Key unit		Continuity
   Connector	Terminal	Connector	Terminal
   M17	8	M38	9	Yes

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair the harness or connector.

CHECK PUSH-BUTTON IGNITION SWITCH SIGNAL CIRCUIT (SHORT TO GROUND)

Check continuity between push-button ignition switch harness connector and ground.

Push-button ignition switch		—	Continuity
Connector	Terminal
M17	8	Ground	No

Is the inspection result normal?

YES>>

Replace Intelligent Key unit. Refer to Removal and Installation.

NO>>

Repair the harness or connector.

CHECK PUSH-BUTTON IGNITION SWITCH GROUND CIRCUIT

Check continuity between push-button ignition switch harness connector and ground.

Push-button ignition switch		—	Continuity
Connector	Terminal
M17	4	Ground	Yes

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Repair the harness or connector.

CHECK PUSH-BUTTON IGNITION SWITCH

Check push-button ignition switch. Refer to Component Inspection.

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Replace push-button ignition switch. Refer to Removal and Installation.

Component Inspection

CHECK PUSH-BUTTON IGNITION SWITCH

1. Ignition switch OFF.

2. Disconnect push-button ignition switch connector.

3. Check continuity between push-button ignition switch terminals.

   Push-button ignition switch		Condition	Continuity
   Terminals
   4	8	Pressed	Yes
   		Not pressed	No

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Replace push-button ignition switch. Refer to Removal and Installation.

Accessory Relay Nissan Pathfinder 2025

Component Inspection

CHECK ACCESSORY RELAY

1. Ignition switch OFF.

2. Disconnect accessory relay connector.

3. Check continuity between accessory relay terminals.

Accessory relay		Condition	Continuity
Terminals
		12 V direct current supply between terminals and .	Yes
		No current supply	No

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Replace accessory relay.

Ignition Relay-1 Nissan Pathfinder 2022

Component Inspection

CHECK IGNITION RELAY-1

1. Ignition switch OFF.

2. Disconnect ignition relay-1 connector.

3. Check continuity between ignition relay-1 terminals.

Ignition relay-1		Condition	Continuity
Terminals
		12 V direct current supply between terminals and .	Yes
		No current supply	No

Is the inspection result normal?

YES>>

Inspection End

NO>>

Replace ignition relay-1.

Power Supply and Ground Circuit Nissan Pathfinder

Ipdm E/r (intelligent Power Distribution Module Engine Room)

Diagnosis Procedure

CHECK FUSIBLE LINKS

Check that the following IPDM E/R fusible links are not blown:

Terminal	Signal name	Fusible link Nos.	Capacity
1	Battery	H	100 A
2		F
81		D
		O	40 A

Is the fusible link blown?

YES>>

Replace the blown fusible link after repairing the affected circuit.

NO>>

GO TO 2

CHECK POWER SUPPLY CIRCUIT

1. Disconnect IPDM E/R connector.

2. Check voltage between IPDM E/R harness connector and ground.

   IPDM E/R		—	Voltage (Approx.)
   Connector	Terminal
   E118	1	Ground	Battery voltage
   	2
   E77	81

Is the inspection result normal?

YES>>

GO TO 3

NO>>

Repair harness or connectors.

CHECK GROUND CIRCUIT

1. Ignition switch OFF.

2. Disconnect IPDM E/R connector.

3. Check continuity between IPDM E/R harness connector and ground.

IPDM E/R		—	Continuity
Connector	Terminal
E120	12	Ground	Yes
E119	31
E121	47

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Repair harness or connectors.