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Nissan

Nissan Ariya: Dtc/circuit Diagnosis

Nissan Ariya (FE0) 2023-2025 Service & Repair Manual / Electrical & Power Control / Body Control System / Dtc/circuit Diagnosis

B2c95-01 Combination Switch

DTC Description

DTC DETECTION LOGIC

DTC No. CONSULT screen items DTC Detection Condition
B2C95-01 Combination switch Diagnosis condition Power 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

With CONSULT

  1. Erase DTC.

  2. Power switch OFF.

  3. Perform the “Self Diagnostic Result” of BCM with CONSULT, when passed 2 seconds or more after the power switch is turned OFF (auto ACC status).

Is DTC detected?

YES>>

Refer to Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

Diagnosis Procedure

CHECK COMBINATION SWITCH CIRCUIT FOR SHORT TO BATTERY

  1. Power switch OFF.

  2. Disconnect combination switch connector and BCM connectors.

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

    + -

    Voltage

    (Approx.)
    Combination switch
    Connector Terminal
    M32 1 Ground 0 V
    2
    3
    4
    5
    6
    7
    8
    10
    12
    13
    15

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Repair or replace harness or connectors.

PERFORM “DATA MONITOR” OF BCM (COMB SW)

With CONSULT

  1. Connect combination switch connector and BCM connectors.

  2. Perform “Data Monitor” 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

DTC Description

DTC DETECTION LOGIC

DTC No. CONSULT screen items DTC Detection Condition
B2C95-64 Combination switch Diagnosis condition Power 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

With CONSULT

  1. Erase DTC.

  2. Power switch OFF.

  3. Perform the “Self Diagnostic Result” of BCM with CONSULT, when passed 2 seconds or more after the power switch is turned OFF (auto ACC status).

Is DTC detected?

YES>>

Refer to Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

Diagnosis Procedure

CHECK COMBINATION SWITCH SYSTEM SYMPTOMS

Perform COMBINATION SWITCH SYSTEM SYMPTOMS. Refer to Symptom Table.

>>

INSPECTION END

U0073-00 Can Comm Circuit

DTC Description

DESCRIPTION

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-Nissan Ariya vehicle multiplex communication line with high data communication speed and excellent error detection ability. Modern Nissan Ariya vehicle is 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 H-line, CAN L-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 DTC Detection Condition
U0073-00 Control module communication Bus A Off Diagnosis condition Power switch is ON.
Signal (terminal) CAN communication signal
Threshold Transmission error or reception error
Diagnosis delay time 2 seconds or more

POSSIBLE CAUSE

CAN communication system

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

CHECK SELF-DIAG RESULT

With CONSULT

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

  2. Perform “Self Diagnostic Result” mode of “BCM” using CONSULT.

Is DTC detected?

YES>>

Refer to Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

Diagnosis Procedure

CHECK CAN COMMUNICATION SYSTEM

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

>>

INSPECTION END

U1327-52 Mac Key

DTC Description

DTC DETECTION LOGIC

DTC No. CONSULT screen items DTC Detection Condition
U1327-52 MAC 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 Ariya 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

With CONSULT

  1. Ignition switch ON.

  2. Perform “MAC key writing”. Refer to Description.

  3. Perform “MAC Diagnosis” of “BCM” using CONSULT.

Is DTC U1327-52 detected as the current malfunction?

YES>>

Refer to Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

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

With CONSULT

  1. Perform “MAC key writing”. Refer to Description.

  2. Perform “MAC Diagnosis” of “BCM” using CONSULT.

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

DTC Description

DTC DETECTION LOGIC

DTC No. CONSULT screen items DTC Detection Condition
U1327-54 MAC 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

With CONSULT

  1. Power switch ON.

  2. Perform “MAC Diagnosis” of “BCM” using CONSULT.

Is DTC U1327-54 detected as the current malfunction?

YES>>

Refer to Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

Diagnosis Procedure

PERFORM MAC KEY WRITING

With CONSULT

  1. Perform “MAC key writing”. Refer to Description.

  2. Perform “MAC Diagnosis” of “BCM” using CONSULT.

Is DTC U1327-54 detected as the current malfunction?

YES>>

GO TO 2.

NO>>

INSPECTION END

PERFORM MAC KEY WRITING AGAIN (SECOND TIMES)

With CONSULT

  1. Restart CONSULT.

  2. Perform “MAC Key writing” again. Refer to Description.

  3. Perform “MAC Diagnosis” of “BCM” using CONSULT.

Is DTC U1327-54 detected as the current malfunction?

YES>>

GO TO 3.

NO>>

INSPECTION END

PERFORM MAC KEY WRITING AGAIN (THIRD TIMES)

With CONSULT

  1. Restart CONSULT.

  2. Perform “MAC Key writing” again. Refer to Description.

  3. Perform “MAC Diagnosis” of “BCM” using CONSULT.

Is DTC U1327-54 detected as the current malfunction?

YES>>

Replace BCM. Refer to Removal and Installation.

NO>>

INSPECTION END

U1c00-08 Lin Communication

DTC Description

NOTE:

When the power switch is turned ON, the DTC may be detected. If it has been detected due to previous error/operation, erase the history once and check if the DTC is detected again.

DTC DETECTION LOGIC

DTC No. CONSULT screen terms DTC detection condition
U1C00-08 LIN communication Diagnosis condition Power switch OFF (auto ACC status) or ON
Signal (terminal) LIN communication signal
Threshold BCM detects LIN communication error.
Diagnosis delay time 1 second or less

POSSIBLE CAUSE

  • Harness or connector (The light & rain sensor circuit is open or shorted)

  • Light & rain sensor

  • BCM

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

CHECK SELF-DIAG RESULT

With CONSULT

  1. Power switch ON.

  2. Select “Self Diagnostic Result” mode of “BCM” using CONSULT.

Is DTC detected?

YES>>

Refer to Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

Diagnosis Procedure

CHECK LIN COMMUNICATION CIRCUIT

Check LIN communication circuit. Refer to Diagnosis Procedure.

>>

INSPECTION END

U1c01-08 Lin Communication

DTC Description

NOTE:

When the power switch is turned ON, the DTC may be detected. If it has been detected due to previous error/operation, erase the history once and check if the DTC is detected again.

DTC DETECTION LOGIC

DTC No. CONSULT screen items DTC Detection Condition
U1C01-08 LIN communication Diagnosis condition Power 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

With CONSULT

  1. Power switch ON.

  2. Perform “Self Diagnostic Result” mode of “BCM” using CONSULT.

Is DTC detected?

YES-1>>

CRNT: Refer to Diagnosis Procedure.

YES-2>>

PAST: GO TO 2.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

CHECK OPERATION

Check the automatic back door system (hands free function) operate properly.

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Refer to Diagnosis Procedure.

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 SERIAL COMMUNICATION

Check automatic back door serial communication.

Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

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

NO>>

Repair or replace harness.

U1c02-08 Lin Communication

DTC Description

NOTE:

When the power switch is turned ON, the DTC may be detected. If it has been detected due to previous error/operation, erase the history once and check if the DTC is detected again.

DTC DETECTION LOGIC

DTC No. CONSULT screen items DTC Detection Condition
U1C02-08 LIN communication Diagnosis condition Power 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

  • Power window main switch

  • Front power window motor (driver side)

  • Front power window motor (passenger side)

  • Rear power window motor RH

  • Rear power window motor LH

  • Sunroof motor assembly

  • Sunshade motor assembly

  • Passenger door mirror control module

  • BCM

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

CHECK DTC PRIORITY 1

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

  • B2C40-04

  • B2C41-04

  • B2C42-04

  • B2C43-04

  • B2C44-04

  • B2F98-04

  • B2F99-04

  • B2CCF-04

Is applicable DTC detected?

YES-1>>

B2C40-04: Refer to DTC Description.

YES-2>>

B2C41-04: Refer to DTC Description.

YES-3>>

B2C42-04: Refer to DTC Description.

YES-4>>

B2C43-04: Refer to DTC Description.

YES-5>>

B2C44-04: Refer to DTC Description.

YES-6>>

B2F98-04: Refer to DTC Description.

YES-7>>

B2F99-04: Refer to DTC Description.

YES-8>>

B2CCF-04: Refer to DTC Description.

NO>>

GO TO 2.

CHECK DTC PRIORITY 2

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

  • B2C40-95

  • B2C41-95

  • B2C42-95

  • B2C43-95

  • B2C44-95

  • B2F98-95

  • B2F99-95

  • B2CCF-95

Is applicable DTC detected?

YES-1>>

B2C40-95: Refer to DTC Description.

YES-2>>

B2C41-95: Refer to DTC Description.

YES-3>>

B2C42-95: Refer to DTC Description.

YES-4>>

B2C43-95: Refer to DTC Description.

YES-5>>

B2C44-95: Refer to DTC Description.

YES-6>>

B2F98-95: Refer to DTC Description.

YES-7>>

B2F99-95: Refer to DTC Description.

YES-8>>

B2CCF-95: Refer to DTC Description.

NO>>

GO TO 3.

CHECK SELF-DIAG RESULT

With CONSULT

  1. Power switch ON.

  2. Perform “Self Diagnostic Result” mode of “BCM” using CONSULT.

Is DTC detected?

YES-1>>

CRNT: Refer to Diagnosis Procedure.

YES-2>>

PAST: GO TO 4.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

CHECK OPERATION

Check that following systems operate properly.

  • Power window

  • Sunroof

  • Sunshade

  • Passenger door mirror

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Refer to Diagnosis Procedure.

Diagnosis Procedure

CHECK DTC PRIORITY 1

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

  • B2C40-04

  • B2C41-04

  • B2C42-04

  • B2C43-04

  • B2C44-04

  • B2F98-04

  • B2F99-04

  • B2CCF-04

Is applicable DTC detected?

YES-1>>

B2C40-04: Refer to DTC Description.

YES-2>>

B2C41-04: Refer to DTC Description.

YES-3>>

B2C42-04: Refer to DTC Description.

YES-4>>

B2C43-04: Refer to DTC Description.

YES-5>>

B2C44-04: Refer to DTC Description.

YES-6>>

B2F98-04: Refer to DTC Description.

YES-7>>

B2F99-04: Refer to DTC Description.

YES-8>>

B2CCF-04: Refer to DTC Description.

NO>>

GO TO 2.

CHECK DTC PRIORITY 2

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

  • B2C40-95

  • B2C41-95

  • B2C42-95

  • B2C43-95

  • B2C44-95

  • B2F98-95

  • B2F99-95

  • B2CCF-95

Is applicable DTC detected?

YES-1>>

B2C40-95: Refer to DTC Description.

YES-2>>

B2C41-95: Refer to DTC Description.

YES-3>>

B2C42-95: Refer to DTC Description.

YES-4>>

B2C43-95: Refer to DTC Description.

YES-5>>

B2C44-95: Refer to DTC Description.

YES-6>>

B2F98-95: Refer to DTC Description.

YES-7>>

B2F99-95: Refer to DTC Description.

YES-8>>

B2CCF-95: Refer to DTC Description.

NO>>

GO TO 3.

CHECK POWER WINDOW OPERATION

Check power window operation using power window main switch.

Is the inspection result normal?

YES>>

GO TO 14.

NO-1>>

Not operate (all power window) :GO TO 4.

NO-2>>

Not operate (driver side) : GO TO 6.

NO-3>>

Not operate (passenger side) : GO TO 8.

NO-4>>

Not operate (rear RH) : GO TO 10.

NO-5>>

Not operate (rear LH) : GO TO 12.

CHECK POWER WINDOW MAIN SWITCH POWER SUPPLY AND GROUND CIRCUIT

Check power window main switch power supply and ground circuit. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Repair or replace the malfunctioning parts.

CHECK LIN COMMUNICATION CIRCUIT (POWER WINDOW MAIN SWITCH)

Check LIN communication circuit. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

Replace power window main switch. Refer to Removal and Installation.

NO>>

Repair or replace the malfunctioning parts.

CHECK FRONT POWER WINDOW MOTOR (DRIVER SIDE) POWER SUPPLY AND GROUND CIRCUIT

Check front power window motor (driver side) power supply and ground circuit. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

GO TO 7.

NO>>

Repair or replace the malfunctioning parts.

CHECK LIN COMMUNICATION CIRCUIT [FRONT POWER WINDOW MOTOR (DRIVER SIDE)]

Check LIN communication circuit. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

Replace front power window motor (driver side). Refer to Disassembly & Assembly.

NO>>

Repair or replace the malfunctioning parts.

CHECK FRONT POWER WINDOW MOTOR (PASSENGER SIDE) POWER SUPPLY AND GROUND CIRCUIT

Check front power window motor (passenger side) power supply and ground circuit. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

GO TO 9.

NO>>

Repair or replace the malfunctioning parts.

CHECK LIN COMMUNICATION CIRCUIT [FRONT POWER WINDOW MOTOR (PASSENGER SIDE)]

Check LIN communication circuit. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

Replace front power window motor (passenger side). Refer to Disassembly & Assembly.

NO>>

Repair or replace the malfunctioning parts.

CHECK REAR POWER WINDOW MOTOR RH POWER SUPPLY AND GROUND CIRCUIT

Check rear power window motor RH power supply and ground circuit. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

GO TO 11.

NO>>

Repair or replace the malfunctioning parts.

CHECK LIN COMMUNICATION CIRCUIT (REAR POWER WINDOW MOTOR RH)

Check LIN communication circuit. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

Replace rear power window motor RH. Refer to Disassembly & Assembly.

NO>>

Repair or replace the malfunctioning parts.

CHECK REAR POWER WINDOW MOTOR LH POWER SUPPLY AND GROUND CIRCUIT

Check rear power window motor LH power supply and ground circuit. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

GO TO 13.

NO>>

Repair or replace the malfunctioning parts.

CHECK LIN COMMUNICATION CIRCUIT (REAR POWER WINDOW MOTOR LH)

Check LIN communication circuit. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

Replace rear power window motor LH. Refer to Disassembly & Assembly.

NO>>

Repair or replace the malfunctioning parts.

CHECK Nissan Ariya Vehicle SPECIFICATION

Check if vehicle equipped sunroof and sunshade.

Is equipped sunroof and sunshade?

YES>>

GO TO 15.

NO>>

GO TO 21.

CHECK SUNROOF AND SUNSHADE OPERATION

Check sunroof and sunshade operation.

Is the inspection result normal?

YES>>

GO TO 21.

NO-1>>

Not operate (sunroof and sunshade) : GO TO 16.

NO-2>>

Not operate (sunroof) : GO TO 17.

NO-3>>

Not operate (sunshade) : GO TO 19.

CHECK OPEN/CLOSED STATE THE SUNROOF AND SUNSHADE

Check open/closed state of the sunroof and sunshade.

Which is the state of sunroof and sunshade?

The sunroof and sunshade fully open>>

GO TO 17.

The sunroof and sunshade fully closed>>

GO TO 19.

CHECK SUNROOF MOTOR ASSEMBLY POWER SUPPLY AND GROUND CIRCUIT

Check sunroof motor assembly power supply and ground circuit. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

GO TO 18.

NO>>

Repair or replace the malfunctioning parts.

CHECK LIN COMMUNICATION CIRCUIT (SUNROOF MOTOR ASSEMBLY)

Check LIN communication circuit. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

Replace sunroof motor assembly. Refer to Removal & Installation.

NO>>

Repair or replace the malfunctioning parts.

CHECK SUNSHADE MOTOR ASSEMBLY POWER SUPPLY GROUND CIRCUIT

Check sunshade motor assembly power supply and ground circuit. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

GO TO 20.

NO>>

Repair or replace the malfunctioning parts.

CHECK LIN COMMUNICATION CIRCUIT (SUNSHADE MOTOR ASSEMBLY)

Check LIN communication circuit. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

Replace sunshade motor assembly. Refer to Removal & Installation.

NO>>

Repair or replace the malfunctioning parts.

CHECK Nissan Ariya Vehicle SPECIFICATION

Check if vehicle equipped automatic drive positioner.

Is equipped automatic drive positioner?

YES>>

GO TO 21.

NO>>

INSPECTION END

CHECK PASSENGER DOOR MIRROR OPERATION

Check passenger door mirror operation.

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

GO TO 23.

CHECK PASSENGER DOOR MIRROR CONTROL MODULE CIRCUIT

Check passenger door mirror control module circuit. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

Replace passenger door mirror control module. Refer to Removal & Installation.

NO>>

Repair or replace the malfunctioning parts.

U1c03-08 Lin Communication

DTC Description

NOTE:

When the power switch is turned ON, the DTC may be detected. If it has been detected due to previous error/operation, erase the history once and check if the DTC is detected again.

DTC DETECTION LOGIC

DTC No. CONSULT screen terms DTC detection condition
U1C03-08 LIN communication Diagnosis condition Power switch OFF (auto ACC status) or ON
Signal (terminal) LIN communication signal
Threshold BCM detects LIN communication error.
Diagnosis delay time 1 second or less

POSSIBLE CAUSE

  • LIN communication line

  • Advanced ambient light (front door)

  • Advanced ambient light (instrument upper)

  • BCM

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

CHECK SELF-DIAG RESULT

With CONSULT

  1. Power switch ON.

  2. Select “Self Diagnostic Result” mode of “BCM” using CONSULT.

Is DTC detected?

YES>>

Refer to Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

Diagnosis Procedure

CHECK SELF-DIAGNOSIS RESULT

With CONSULT

  1. Power switch ON.

  2. Select “Self Diagnostic Result” mode of “BCM” using CONSULT.

Are the DTC B2C76-04, B2C77-04, B2C78-04 and B2C79-04 detecting?

YES-1>>

All of the above DTCs are detected.: GO TO 2.

YES-2>>

Any of the above DTCs is detected.: Perform diagnosis of the corresponding DTC. Refer to DTC Index.

NO>>

All of the above DTCs are not detected.: Replace BCM. Refer to Removal and Installation.

CHECK INTERIOR ROOM LAMP POWER SUPPLY CIRCUIT

Check interior room lamp power supply circuit. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair or replace malfunctioning parts.

CHECK ADVANCED AMBIENT LIGHT POWER SUPPLY CIRCUIT

  1. Power switch OFF.

  2. Disconnect following connectors.

    • Fuse block (J/B)

    • Advanced ambient light (front door LH)

    • Advanced ambient light (front door RH)

    • Advanced ambient light (instrument upper LH)

    • Advanced ambient light (instrument upper RH)

  3. Check continuity between fuse block (J/B) harness connector and each advanced ambient light harness connector.

    Front door
    Fuse block (J/B) Advanced ambient light (front door) Continuity
    Connector Terminal Connector Terminal
    RH M74 93 D11 1 Existed
    LH D51
    Instrument upper
    Fuse block (J/B) Advanced ambient light (instrument upper) Continuity
    Connector Terminal Connector Terminal
    RH M74 93 M77 1 Existed
    LH M76

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair or replace harness.

CHECK LIN COMMUNICATION SIGNAL

  1. Connect fuse block (J/B) connector.

  2. Power switch ON.

  3. Check output waveform between BCM harness connector and ground using oscilloscope.

    + - Output waveform
    BCM
    Connector Terminal
    M8 3 Ground

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Replace BCM. Refer to Removal and Installation.

CHECK LIN COMMUNICATION SIGNAL CIRCUIT

  1. Power switch OFF.

  2. Disconnect BCM connector.

  3. Check continuity between BCM harness connector and ground.

    BCM — Continuity
    Connector Terminal
    M8 3 Ground Not existed

Is the inspection result normal?

YES>>

GO TO 6.

NO>>

Repair or replace harness.

CHECK LIN COMMUNICATION LINE (ADVANCED AMBIENT LIGHT)

With CONSULT

  1. Connect following connectors.

    • BCM

    • Advanced ambient light (front door LH)

    • Advanced ambient light (front door RH)

    • Advanced ambient light (instrument upper LH)

    • Advanced ambient light (instrument upper RH)

  2. Power switch ON.

  3. Select “Self Diagnostic Result” mode of “BCM” using CONSULT.

  4. Confirm DTC detection state when each advanced ambient light connector is disconnected.

    CAUTION:

    The advanced ambient light connector removed for diagnosis should be reconnected after diagnosis and diagnose another part.

    When the advanced ambient light (front door LH) is removed.
    DTC detection state Diagnosis result
    Detecting DTC B2C76-04, B2C77-04 or B2C78-04. A
    Not detecting DTC B2C76-04, B2C77-04 or B2C78-04. B
    When the advanced ambient light (front door RH) is removed.
    DTC detection state Diagnosis result
    Detecting DTC B2C76-04, B2C77-04 or B2C79-04. A
    Not detecting DTC B2C76-04, B2C77-04 or B2C79-04. C
    When the advanced ambient light (instrument upper LH) is removed.
    DTC detection state Diagnosis result
    Detecting DTC B2C76-04, B2C78-04 or B2C79-04. A
    Not detecting DTC B2C76-04, B2C78-04 or B2C79-04. D
    When the advanced ambient light (instrument upper RH) is removed.
    DTC detection state Diagnosis result
    Detecting DTC B2C77-04, B2C78-04 or B2C79-04. A
    Not detecting DTC B2C77-04, B2C78-04 or B2C79-04. E

What is the diagnosis result?

A>>

When the diagnosis result of all parts is "A".: Replace BCM. Refer to Removal and Installation.

B>>

Replace advanced ambient light (front door LH). Refer to Replacement.

C>>

Replace advanced ambient light (front door RH). Refer to Replacement.

D>>

Replace advanced ambient light (instrument upper LH). Refer to Replacement.

E>>

Replace advanced ambient light (instrument upper RH). Refer to Replacement.

U2143-57 Mac Comm Error (vcm)

DTC Description

DTC DETECTION LOGIC

DTC No. CONSULT screen items DTC Detection Condition
U2143-57 CAN comm err (VCM/HCM) 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 Ariya vehicle

  • BCM

  • VCM

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

CHECK DTC PRIORITY

If DTC U2143-57 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.

  • U1327-54: Refer to DTC Description.

NO>>

GO TO 2.

CHECK MAC DIAGNOSIS

With CONSULT

  1. Power switch ON.

  2. Perform “MAC Diagnosis” mode of “BCM” using CONSULT.

Is DTC U2143-57 detected?

YES>>

Refer to Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

Diagnosis Procedure

CHECK DTC PRIORITY

If DTC U2143-57 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.

  • U1327-54: Refer to DTC Description.

NO>>

GO TO 2.

CHECK MAC DIAGNOSIS

With CONSULT

Perform “MAC Diagnosis” mode of “BCM” using CONSULT.

Is DTC U2143-57 detected with DTC U2152-57, DTC U2175-57 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

Diagnosis Procedure

CHECK FUSE

  1. Power switch OFF.

  2. Check that the following fuses are not blown (open).

    Unit Location Fuses No. Capacity
    BCM Fuse block (J/B) #147 5A
    #23

Is the fuses blown (open)?

YES>>

Replace the blown (open) fuses after repairing the affected circuit if a fuses are blown (open).

NO>>

GO TO 2.

CHECK POWER SUPPLY CIRCUIT

  1. Disconnect BCM connectors.

  2. Check voltage between BCM harness connector and ground.

    + − Voltage
    BCM
    Connector Terminal
    M8 7 Ground 9 – 16 V
    B14 133

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
B14 129 Ground Existed
137

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Repair harness or connector.

Combination Switch Input Circuit

Diagnosis Procedure

CHECK INPUT CIRCUIT

  1. Power switch OFF.

  2. Disconnect combination switch connector.

  3. Power switch ON.

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

    Switch signal + − Voltage
    Combination switch
    Connector Terminal
    Input 1 M32 1 Ground 9 – 16 V
    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. Power 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 M7 67 M32 1 Existed
    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 M7 67 Ground Not existed
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

Diagnosis Procedure

CHECK OUTPUT CIRCUIT

  1. Power switch ON.

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

  3. Check duty ratios between BCM harness connector and ground by using an oscilloscope.

    System + − Output waveform
    BCM
    Connector Terminal
    Output 1 M7 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-1>>

Fixed to 0 V: GO TO 2.

NO-2>>

Fixed to 9 – 16 V: Replace BCM. Refer to Removal and Installation.

CHECK OUTPUT CIRCUIT FOR OPEN

  1. Power 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 M7 48 M32 7 Existed
    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 harnesses or connector.

CHECK OUTPUT CIRCUIT FOR SHORT

Check for continuity between BCM harness connector and ground.

System BCM — Continuity
Connector Terminal
Output 1 M7 48 Ground Not existed
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 harnesses or connector.

 
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Nissan Ariya (FE0) 2023-2025 Service & Repair Manual

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