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Nissan Pathfinder: Power Control System - Dtc/circuit Diagnosis

Nissan Pathfinder (R53) 2022-2025 Service Manual / Electrical & Power Control :: Power Control System / Power Distribution System / Dtc/circuit Diagnosis

B2fac-12 Accessory Relay Nissan Pathfinder

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 Fifth generation

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 Fifth generation

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

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 Fifth generation

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 2022

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 5th Gen

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.

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Nissan Pathfinder (R53) 2022-2025 Service Manual

Dtc/circuit Diagnosis

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