Nissan Pathfinder: Body Control System - Dtc/circuit Diagnosis

• B2c95-01 Combination Switch
• B2c95-64 Combination Switch
• U0073-00 Control Module Comm Bus a Off
• U1327-52 Mac Key Update
• U1327-54 Mac Key Update
• U1c01-08 Lin Communication
• U1c02-08 Lin Communication
• U2140-57 Can Comm Err (ecm)
• Power Supply and Ground Circuit
• Combination Switch Input Circuit
• Combination Switch Output Circuit

B2c95-01 Combination Switch Nissan Pathfinder 2022

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC Detection Condition
B2C95-01	Combination switch (Combination switch)	Diagnosis condition	Ignition switch OFF (auto ACC status).
		Signal (terminal)	Combination switch signal.
		Threshold	Combination switch circuit short to battery.
		Diagnosis delay time	2 seconds or more.

POSSIBLE CAUSE

• Harness or connector (combination switch circuit is short to battery)

• Combination switch

• BCM

FAIL-SAFE

Turns ON the headlamp (LO)

DTC CONFIRMATION PROCEDURE

CHECK SELF-DIAG RESULT

CONSULT

1. Erase DTC.

2. Ignition switch OFF.

3. Select “Self Diagnostic Result” mode of "BCM", when 2 seconds or more have passed after the ignition switch is OFF (auto ACC status).

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 COMBINATION SWITCH CIRCUIT FOR SHORT TO BATTERY

1. Ignition switch OFF.

2. Disconnect combination switch connector and BCM connector M19.

3. Check voltage between combination switch harness connector and ground.

   +		-	Voltage (Approx.)
   Combination switch
   Connector	Terminal
   M28	1	Ground	0 V
   	3
   	4
   	6
   	8
   	13
   	12
   	7
   	15
   	10
   	5
   	2

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Repair or replace harness or connectors.

PERFORM “DATA MONITOR” OF BCM (COMB SW)

CONSULT

1. Connect combination switch connector and BCM connector.

2. Select “Data Monitor” mode of "BCM(COMB SW)" to check for any malfunctioning item. Refer to Symptom Table.

Is the inspection result normal?

YES>>

Replace combination switch. Refer to Removal and Installation.

NO>>

Replace BCM. Refer to Removal and Installation.

B2c95-64 Combination Switch Nissan Pathfinder 5th Gen

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC Detection Condition
B2C95-64	Combination switch (Combination switch)	Diagnosis condition	Ignition switch OFF (auto ACC status).
		Signal (terminal)	Combination switch signal.
		Threshold	BCM detects the combination switch check diode positions stuck at ON for 2 seconds or more.
		Diagnosis delay time	2 seconds or more.

POSSIBLE CAUSE

• Harness or connector (combination switch circuit is short to battery)

• Combination switch

• BCM

FAIL-SAFE

Turns ON the headlamp (LO)

DTC CONFIRMATION PROCEDURE

CHECK SELF-DIAG RESULT

CONSULT

1. Erase DTC.

2. Ignition switch OFF.

3. Select “Self Diagnostic Result” mode of "BCM", when 2 seconds or more have passed after the ignition switch is OFF (auto ACC status).

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 COMBINATION SWITCH SYSTEM SYMPTOMS

Perform COMBINATION SWITCH SYSTEM SYMPTOMS. Refer to Symptom Table.

>>

Inspection End.

U0073-00 Control Module Comm Bus a Off Nissan Pathfinder R53

DTC Description

DESCRIPTION

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-Nissan Pathfinder vehicle multiplex communication line with high data communication speed and excellent error detection ability. Modern Nissan Pathfinder vehicles are equipped with many electronic control unit, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN-High line, CAN-Low line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only. CAN Communication Signal Chart. Refer to CAN Communication Signal Chart.

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC Detection Condition
U0073-00	Control module comm Bus A Off (Control module communication Bus A Off)	Diagnosis condition	Ignition switch is ON.
		Signal (terminal)	CAN communication signal.
		Threshold	BCM cannot communicate CAN communication signal.
		Diagnosis delay time	2 seconds or more.

POSSIBLE CAUSE

CAN communication system

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

CHECK SELF-DIAG RESULT

CONSULT

1. Ignition switch ON and wait for 2 seconds or more.

2. 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 CAN COMMUNICATION SYSTEM

Check CAN communication system. Refer to Trouble Diagnosis Flow Chart.

>>

Inspection End.

U1327-52 Mac Key Update Nissan Pathfinder

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC Detection Condition
U1327-52	MAC key update (Message Authentication Code key update)	Diagnosis condition	-
		Signal (terminal)	-
		Threshold	MAC key writing is incomplete.
		Diagnosis delay time	-

POSSIBLE CAUSE

• Network communication error between CONSULT and BCM

• BCM used in other vehicles is installed in the Nissan Pathfinder vehicle

• BCM

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

CHECK DTC PRIORITY

If DTC U1327-52 is displayed with DTC U1327-54, first perform the trouble diagnosis for DTC U1327-54.

Is DTC U1327-54 detected?

YES>>

Refer to DTC Description.

NO>>

GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON.

2. Select “MAC key writing” in "Work Support" mode of "BCM(BCM)". Refer to Description.

3. Select “MAC Diagnosis” of “BCM”.

Is DTC U1327-52 detected as the current malfunction?

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 DTC PRIORITY

If DTC U1327-52 is displayed with DTC U1327-54, first perform the trouble diagnosis for DTC U1327-54.

Is DTC U1327-54 detected?

YES>>

Refer to DTC Description.

NO>>

GO TO 2.

PERFORM MAC KEY WRITING

CONSULT

1. Select “MAC key writing” in "Work Support" mode of "BCM(BCM)". Refer to Description.

2. Select “MAC Diagnosis” of “BCM”.

Is DTC U1327-52 detected as the current malfunction?

YES>>

GO TO 3.

NO>>

Inspection End.

REPLACE BCM

Replace BCM. Refer to Removal and Installation.

>>

Inspection End.

U1327-54 Mac Key Update Nissan Pathfinder Fifth generation

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC Detection Condition
U1327-54	MAC key update (Message Authentication Code key update)	Diagnosis condition	-
		Signal (terminal)	-
		Threshold	MAC key is not written after BCM replacement.
		Diagnosis delay time	-

POSSIBLE CAUSE

• Writing of MAC key has not been executed

• BCM

FAIL-SAFE

-

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON.

2. Select “MAC Diagnosis” of “BCM”.

Is DTC U1327-54 detected as the current malfunction?

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

PERFORM MAC KEY WRITING

CONSULT

1. Select “MAC key writing” in "Work Support" mode of "BCM(BCM)". Refer to Description.

2. Select “MAC Diagnosis” of “BCM”.

Is DTC U1327-54 detected as the current malfunction?

YES>>

GO TO 2.

NO>>

Inspection End.

PERFORM MAC KEY WRITING AGAIN (SECOND TIME)

CONSULT

1. Restart CONSULT.

2. Select “MAC key writing” in "Work Support" mode of "BCM(BCM)" again. Refer to Description.

3. Select “MAC Diagnosis” of “BCM”.

Is DTC U1327-54 detected as the current malfunction?

YES>>

GO TO 3.

NO>>

Inspection End.

PERFORM MAC KEY WRITING AGAIN (THIRD TIME)

CONSULT

1. Restart CONSULT.

2. Select “MAC key writing” in "Work Support" mode of "BCM(BCM)" again. Refer to Description.

3. Select “MAC Diagnosis” of “BCM”.

Is DTC U1327-54 detected as the current malfunction?

YES>>

Replace BCM. Refer to Removal and Installation.

NO>>

Inspection End.

U1c01-08 Lin Communication Nissan Pathfinder Fifth generation

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC Detection Condition
U1C01-08	LIN communication (Local interconnect network communication)	Diagnosis condition	Ignition switch is ON or OFF (auto ACC status).
		Signal (terminal)	LIN communication signal.
		Threshold	BCM detects LIN communication error.
		Diagnosis delay time	1 second or less.

POSSIBLE CAUSE

• LIN communication line

• Hands free sensor control unit

• BCM

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

CHECK SELF-DIAG RESULT

CONSULT

1. Ignition switch ON.

2. 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 HANDS FREE SENSOR CONTROL UNIT POWER SUPPLY AND GROUND CIRCUIT

Check hands free sensor control unit power supply and ground circuit.

Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Repair or replace harness.

CHECK AUTOMATIC BACK DOOR LIN COMMUNICATION

Check automatic back door LIN communication.

Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

Replace hands free sensor control unit. Refer to Removal and Installation.

NO>>

Inspection End.

U1c02-08 Lin Communication Nissan Pathfinder R53

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC Detection Condition
U1C02-08	LIN communication (Local interconnect network communication)	Diagnosis condition	Ignition switch is ON or OFF (auto ACC status).
		Signal (terminal)	LIN communication signal.
		Threshold	BCM detects LIN communication error.
		Diagnosis delay time	1 second or less.

POSSIBLE CAUSE

• LIN communication line

• Main power window and door mirror switch

• Front power window motor LH

• Passenger door mirror control module

• Moonroof motor assembly

• Sunshade motor assembly

• BCM

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

CHECK DTC PRIORITY

If DTC U1C02-08 is displayed with following DTC, first perform the trouble diagnosis for following DTC:

• B2C40-04

• B2C41-04

• B2CCF-04

• B2F98-04

• B2F99-04

Is applicable DTC detected?

YES>>

B2C40-04: Refer to DTC Description.

YES>>

B2C41-04: Refer to DTC Description.

YES>>

B2CCF-04: Refer to DTC Description.

YES>>

B2F98-04: Refer to DTC Description.

YES>>

B2F99-04: Refer to DTC Description.

NO>>

GO TO 2.

CHECK SELF-DIAG RESULT

CONSULT

1. Ignition switch ON.

2. 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 DTC PRIORITY

If DTC U1C02-08 is displayed with following DTC, first perform the trouble diagnosis for following DTC:

• B2C40-04

• B2C41-04

• B2CCF-04

• B2F98-04

• B2F99-04

Is applicable DTC detected?

YES>>

B2C40-04: Refer to DTC Description.

YES>>

B2C41-04: Refer to DTC Description.

YES>>

B2CCF-04: Refer to DTC Description.

YES>>

B2F98-04: Refer to DTC Description.

YES>>

B2F99-04: Refer to DTC Description.

NO>>

GO TO 2.

CHECK FRONT LH POWER WINDOW OPERATION

Check front power window LH operation using the main power window and door mirror switch.

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Perform diagnosis of DRIVER SIDE POWER WINDOW DOES NOT OPERATE. Refer to Diagnosis Procedure.

CHECK Nissan Pathfinder Vehicle SPECIFICATION

Check if vehicle is equipped with automatic drive positioner.

Is vehicle equipped with automatic drive positioner?

YES>>

GO TO 4.

NO>>

GO TO 5.

CHECK DOOR MIRROR RH OPERATION

Check door mirror RH operation using main power window and door mirror switch.

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Perform diagnosis of DOOR MIRROR DOES NOT OPERATE. Refer to Diagnosis Procedure (with automatic drive positioner system).

CHECK Nissan Pathfinder Vehicle SPECIFICATION

Check if vehicle equipped moonroof.

Is equipped moonroof?

YES>>

GO TO 6.

NO>>

Inspection End.

CHECK MOONROOF AND SUNSHADE OPERATION

Check moonroof and sunshade operation.

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Perform diagnosis of MOONROOF AND SUNSHADE DOES NOT OPERATE PROPERLY. Refer to Diagnosis Procedure (moonroof) and Diagnosis Procedure (sunshade).

NO>>

Perform diagnosis of MOONROOF DOES NOT OPERATE PROPERLY. Refer to Diagnosis Procedure.

NO>>

Perform diagnosis of SUNSHADE DOES NOT OPERATE PROPERLY. Refer to Diagnosis Procedure.

U2140-57 Can Comm Err (ecm) Nissan Pathfinder R53

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC Detection Condition
U2140-57	CAN comm err (ECM) [Control Area Network communication error (engine control module)]	Diagnosis condition	-
		Signal (terminal)	-
		Threshold	MAC communication error.
		Diagnosis delay time	-

POSSIBLE CAUSE

• MAC communication error

• BCM used in other vehicles is installed in the Nissan Pathfinder vehicle

• BCM

• ECM

FAIL-SAFE

-

DTC CONFIRMATION PROCEDURE

CHECK DTC PRIORITY

If DTC U2140-57 is displayed with DTC U1327-52 or DTC U1327-54, first perform the trouble diagnosis for DTC U1327-52 or U1327-54.

Is DTC U1327-52 or U1327-54 detected?

YES>>

U1327-52: Refer to DTC Description.

YES>>

U1327-54: Refer to DTC Description.

NO>>

GO TO 2.

CHECK MAC DIAGNOSIS

CONSULT

1. Ignition switch ON.

2. Select “MAC Diagnosis” of “BCM”.

Is DTC U2140-57 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 DTC PRIORITY

If DTC U2140-57 is displayed with DTC U1327-52 or DTC U1327-54, first perform the trouble diagnosis for DTC U1327-52 or U1327-54.

Is DTC U1327-52 or U1327-54 detected?

YES>>

U1327-52: Refer to DTC Description.

YES>>

U1327-54: Refer to DTC Description.

NO>>

GO TO 2.

CHECK MAC DIAGNOSIS

CONSULT

Select “MAC Diagnosis” of “BCM”.

Is DTC U2140-57 detected with DTC U2152–57 (with ProPILOT Assist), DTC U2175–57 (with around view monitor control unit) and DTC U2176–57 at the same time?

YES (all DTC codes are detected at the same time)>>

Replace BCM. Refer to Removal and Installation.

NO (all DTC codes are not detected at the same time)>>

GO TO 3.

CHECK CAN COMMUNICATION SYSTEM

Check CAN communication system. Refer to Trouble Diagnosis Flow Chart.

>>

Inspection End.

Power Supply and Ground Circuit Nissan Pathfinder 2022

Diagnosis Procedure

CHECK FUSES AND FUSIBLE LINK

Check that the following fuse and fusible link are not blown:

Terminal No.	Signal name	Fuses No.	Capacity
7	Battery power supply	30	5 A
133		15	10 A
135	Battery power supply (front door lock)	12	15 A
136	Battery power supply (turn signal)	53	10 A
138	Battery power supply (rear wiper)	56	10 A
139	Battery power supply (stop lamp)	21	10 A
144	Battery power supply (rear door lock)	14	15 A

Is the fuse or fusible link blown?

YES>>

Replace the blown fuse or fusible link after repairing the affected circuit.

NO>>

GO TO 2.

CHECK POWER SUPPLY CIRCUIT

1. Disconnect BCM connector.

2. Check voltage between BCM harness connector and ground.

   +		–	Voltage (Approx.)
   BCM
   Connector	Terminal
   M18	7	Ground	Battery voltage
   M81	133
   	135
   	136
   	138
   	139
   	144

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair harness or connector.

CHECK GROUND CIRCUIT

Check continuity between BCM harness connector and ground.

BCM		—	Continuity
Connector	Terminal
M81	137	Ground	Yes
	129

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Repair harness or connector.

Combination Switch Input Circuit Nissan Pathfinder R53

Diagnosis Procedure

CHECK INPUT CIRCUIT

1. Ignition switch OFF.

2. Disconnect combination switch connector.

3. Ignition switch ON.

4. Check voltage between combination switch harness connector and ground.

   Switch signal	+		−	Voltage (Approx.)
   	Combination switch
   	Connector	Terminal
   Input 1	M28	1	Ground	Battery voltage
   Input 2		3
   Input 3		4
   Input 4		6
   Input 5		8
   Input 6		13

Is the inspection result normal?

YES>>

Replace combination switch. Refer to Removal and Installation.

NO>>

GO TO 2.

CHECK INPUT CIRCUIT FOR OPEN

1. Ignition switch OFF.

2. Disconnect BCM connector.

3. Check continuity between BCM harness connector and combination switch harness connector.

   Switch signal	BCM		Combination switch		Continuity
   	Connector	Terminal	Connector	Terminal
   Input 1	M19	67	M28	1	Yes
   Input 2		68		3
   Input 3		69		4
   Input 4		70		6
   Input 5		71		8
   Input 6		72		13

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair harness or connector.

CHECK INPUT CIRCUIT FOR SHORT

Check continuity between BCM harness connector and ground.

Switch signal	BCM		—	Continuity
	Connector	Terminal
Input 1	M19	67	Ground	No
Input 2		68
Input 3		69
Input 4		70
Input 5		71
Input 6		72

Is the inspection result normal?

YES>>

Replace BCM. Refer to Removal and Installation.

NO>>

Repair harness or connector.

Combination Switch Output Circuit Nissan Pathfinder R53

Diagnosis Procedure

CHECK OUTPUT CIRCUIT

1. Ignition switch ON.

2. Turn ON any switch in the system that is malfunctioning.

3. Check voltage between BCM harness connector and ground.

   System	+		−	Voltage (Approx.)
   	BCM
   	Connector	Terminal
   Output 1	M19	48	Ground	Refer to Reference Value.
   Output 2		49
   Output 3		53
   Output 4		52
   Output 5		50
   Output 6		51

Is the inspection result normal?

YES>>

Check intermittent incident. Refer to Intermittent Incident.

NO>>

Fixed to 0 V: GO TO 2.

NO>>

Fixed to battery voltage: Replace combination switch. Refer to Removal and Installation.

CHECK OUTPUT CIRCUIT FOR OPEN

1. Ignition switch OFF.

2. Disconnect BCM connector.

3. Check continuity between BCM harness connector and combination switch harness connector.

   System	BCM		Combination switch		Continuity
   	Connector	Terminal	Connector	Terminal
   Output 1	M19	48	M28	7	Yes
   Output 2		49		15
   Output 3		53		10
   Output 4		52		5
   Output 5		50		2
   Output 6		51		12

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair harness or connector.

CHECK OUTPUT CIRCUIT FOR SHORT

Check for continuity between BCM harness connector and ground.

System	BCM		—	Continuity
	Connector	Terminal
Output 1	M19	48	Ground	No
Output 2		49
Output 3		53
Output 4		52
Output 5		50
Output 6		51

Is the inspection result normal?

YES>>

Replace combination switch. Refer to Removal and Installation.

NO>>

Repair harness or connector.