Nissan Murano: Door & Lock :: Dtc/circuit Diagnosis / B2422 Back Door State

Nissan Murano (Z52) 2015-2024 Service Manual / Body Exterior, Doors, Roof & Vehicle Security / Door & Lock :: Dtc/circuit Diagnosis / B2422 Back Door State

DTC Description

DTC DETECTION LOGIC

DTC No.

CONSULT screen items

(Trouble diagnosis content) 		DTC detecting condition
B2422–78

BACK DOOR STATE

(Back door state) 		Diagnosis condition All times
Signal (terminal) Encoder LH A signal, encoder LH B signal, encoder RH A signal, encoder RH B signal (automatic back door control module connector terminal: 19, 20, 21)
Threshold When the automatic back door control module detect the encoder pulse signal LH does not according with the encoder pulse signal RH
Diagnosis delay time –
B2422–79

BACK DOOR STATE

(Back door state) 		Diagnosis condition All times
Signal (terminal) –
Threshold When automatic back door position information is deleted from automatic back door control module memory
Diagnosis delay time –

POSSIBLE CAUSE

  • Improper installation of back door assembly

  • Calibration of automatic back door position information

  • Back door mechanism

  • Encoder

  • Harness or connectors (encoder circuit is open or shorted)

  • Automatic back door control module

  • Battery terminal is disconnected and reconnected

FAIL-SAFE

Inhibit automatic back door system auto open/close function

DTC Confirmation Procedure

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

  1. Ignition switch ON.

  2. Operate automatic back door.

  3. Select “Self Diagnostic Result” mode of “AUTO BACK DOOR”.

Is DTC detected?

YES>>

DTC “B2422-78”: Refer to DTC Diagnosis Procedure (B2422-78).

YES>>

DTC “B2422-79”: Refer to DTC Diagnosis Procedure (B2422-79).

NO>>

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

NO>>

Confirmation after repair: Inspection End.

Diagnosis Procedure (B2422-78)

CHECK INSTALLATION OF BACK DOOR ASSEMBLY

  1. Check that back door assembly is installed normally.

    Refer to Adjustment.

  2. Check back door assembly mechanism deformation, looseness, rattle, interference with other parts, and pinched foreign materials.

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

GO TO 2.

ADJUST BACK DOOR ASSEMBLY INSTALLATION AND ERASE DTC

CONSULT

  1. Ignition switch OFF.

  2. Adjust the back door assembly installation. Refer to Adjustment.

  3. Ignition switch ON.

  4. Select “Self Diagnostic Result” mode of “AUTO BACK DOOR”.

  5. Erase DTC, and then repeat “DTC CONFIRMATION PROCEDURE”. Refer to DTC Confirmation Procedure.

Is DTC “B2422-78” detected?

YES>>

GO TO 3.

NO>>

Inspection End.

CALIBRATION OF AUTOMATIC BACK DOOR POSITION INFORMATION

CONSULT

  1. Perform initialization setting of automatic back door position information.

    Refer to Work Procedure.

  2. Erase DTC, and then repeat “DTC CONFIRMATION PROCEDURE”. Refer to DTC Confirmation Procedure.

Is DTC “B2422-78” detected?

YES>>

GO TO 4.

NO>>

Inspection End.

CHECK ENCODER MONITOR ITEM

CONSULT

  1. Ignition switch ON.

  2. Select “SPINDLE LH ENCODER A”, “SPINDLE LH ENCODER B”, “SPINDLE RH ENCODER A” and “SPINDLE RH ENCODER B” in “Data Monitor” mode of “AUTO BACK DOOR”.

  3. Check that the function operates normally according to the following conditions:

    Monitor item Condition Status
    SPINDLE LH ENCODER A Back door Moving (auto or manual) HI ⇔ LO
    When stopped HI or LO
    SPINDLE LH ENCODER B Moving (auto or manual) HI ⇔ LO
    When stopped HI or LO
    SPINDLE RH ENCODER A Back door Moving (auto or manual) HI ⇔ LO
    When stopped HI or LO
    SPINDLE RH ENCODER B Moving (auto or manual) HI ⇔ LO
    When stopped HI or LO

Is the inspection result normal?

YES>>

GO TO 11.

NO>>

GO TO 5.

CHECK ENCODER POWER SUPPLY

  1. Ignition switch OFF.

  2. Disconnect spindle unit connector.

  3. Check voltage between spindle unit harness connector and ground.

    (+) (–)

    Voltage

    (Approx.)
    Spindle unit
    Connector Terminal
    LH B70 6 Ground Battery voltage
    RH B162

Is the inspection result normal?

YES>>

GO TO 7.

NO>>

GO TO 6.

CHECK ENCODER POWER SUPPLY CIRCUIT

  1. Disconnect automatic back door control module connector.

  2. Check continuity between automatic back door control module harness connector and spindle unit harness connector.

    Automatic back door control module Spindle unit Continuity
    Connector Terminal Connector Terminal
    B55 19 LH B70 6 Yes
    20 RH B162

  3. Check continuity between automatic back door control module harness connector and ground.

    Automatic back door control module Ground Continuity
    Connector Terminal
    B55 19 No
    20

Is the inspection result normal?

YES>>

Replace automatic back door control module. Refer to Removal and Installation.

NO>>

Repair or replace harness.

CHECK ENCODER CIRCUIT GROUND CIRCUIT

  1. Disconnect automatic back door control module connector.

  2. Check continuity between automatic back door control module harness connector and spindle unit harness connector.

    Automatic back door control module Spindle unit Continuity
    Connector Terminal Connector Terminal
    B55 21 LH B70 3 Yes
    RH B162

  3. Check continuity between automatic back door control module harness connector and ground.

    Automatic back door control module Ground Continuity
    Connector Terminal
    B55 21 No

Is the inspection result normal?

YES>>

GO TO 8.

NO>>

Repair or replace harness.

CHECK ENCODER OUTPUT SIGNAL

  1. Connect spindle unit and automatic back door control module connector.

  2. Check signal between spindle unit harness connector and ground using oscilloscope.

    (+) (–) Condition

    Voltage

    (Approx.)
    Spindle unit
    Connector Terminal
    LH B70 7 Ground Back door Moving (auto)

    When stopped 0 V or 12 V
    10 Moving (auto)

    When stopped 0 V or 12 V
    RH B162 7 Moving (auto)

    When stopped 0 V or 12 V
    10 Moving (auto)

    When stopped 0 V or 12 V

Is the inspection result normal?

YES>>

GO TO 10.

NO>>

GO TO 9.

CHECK ENCODER OUTPUT SIGNAL CIRCUIT

  1. Disconnect automatic back door control module and spindle unit connector.

  2. Check continuity between automatic back door control module harness connector and spindle unit harness connector.

    Spindle unit Automatic back door control module Continuity
    Connector Terminal Connector Terminal
    LH B70 7 B55 6 Yes
    10 7
    RH B162 7 8
    10 9

  3. Check continuity between automatic back door control module harness connector and ground.

    Automatic back door control module Ground Continuity
    Connector Terminal
    B55 6 No
    7
    8
    9

Is the inspection result normal?

YES>>

Replace automatic back door control module. Refer to Removal and Installation.

NO>>

Repair or replace harness.

REPLACE SPINDLE UNIT AND ERASE DTC

CONSULT

  1. Ignition switch OFF.

  2. Replace spindle unit.

  3. Ignition switch ON.

  4. Select “Self Diagnostic Result” mode of “AUTO BACK DOOR”.

  5. Erase DTC, and then repeat “DTC CONFIRMATION PROCEDURE”. Refer to DTC Confirmation Procedure.

Is DTC “B2422-78” detected?

YES>>

Replace automatic back door control module. Refer to Removal and Installation.

NO>>

Inspection End.

CHECK INSTALLATION OF SPINDLE UNIT

Check that spindle unit is installed normally. Refer to Removal and Installation.

Is the inspection result normal?

YES>>

GO TO 13.

NO>>

GO TO 12.

ADJUST SPINDLE UNIT INSTALLATION AND ERASE DTC

CONSULT

  1. Ignition switch OFF.

  2. Adjust the spindle unit installation.

  3. Ignition switch ON.

  4. Select “Self Diagnostic Result” mode of “AUTO BACK DOOR”.

  5. Erase DTC, and then repeat “DTC CONFIRMATION PROCEDURE”. Refer to DTC Confirmation Procedure.

Is DTC “B2422-78” detected?

YES>>

GO TO 13.

NO>>

Inspection End.

REPLACE SPINDLE UNIT AND ERASE DTC

CONSULT

  1. Ignition switch OFF.

  2. Replace spindle unit.

  3. Ignition switch ON.

  4. Select “Self Diagnostic Result” mode of “AUTO BACK DOOR”.

  5. Erase DTC, and then repeat “DTC CONFIRMATION PROCEDURE”. Refer to DTC Confirmation Procedure.

Is DTC “B2422-78” detected?

YES>>

Replace automatic back door control module. Refer to Removal and Installation.

NO>>

Inspection End.

Diagnosis Procedure (B2422-79)

ERASE DTC

CONSULT

  1. Fully close then back door manually.

  2. Ignition switch ON.

  3. Select “Self Diagnostic Result” mode of “AUTO BACK DOOR”.

  4. Erase DTC, and then repeat “PERFORM DTC CONFIRMATION PROCEDURE”. Refer to DTC Confirmation Procedure.

Is DTC “B2422-79” detected?

YES>>

GO TO 2.

NO>>

Inspection End.

CHECK AUTOMATIC BACK DOOR CONTROL MODULE EACH DTC

If DTC “B2422-79” is displayed with DTC “B2426-23, B2426-24, B2426-29, B2427-23, B2427-24, B2427-29”, first perform the trouble diagnosis for DTC “B2426-23, B2426-24, B2426-29, B2427-23, B2427-24, B2427-29”.

Is DTC “B2426-23, B2426-24, B2426-29, B2427-23, B2427-24, B2427-29” detected?

YES>>

Refer to DTC Index.

NO>>

Replace automatic back door control module. Refer to Removal and Installation.

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