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Nissan Sentra B18 (2020-2025) Service Manual: Door Switch

Component Function Check

Component Function Check

  1. CHECK FUNCTION

    1. CONSULT

      1. Select "Door switch AS", "Door switch DR", "Door switch RL" or "Door switch RR" in "Data Monitor" mode of "BCM(DOOR LOCK)".

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

      Monitor Item

      Condition

      Status

      DOOR switch DR

      Front door LH

      Open

      On

      Closed

      Off

      DOOR switch AS

      Front door RH

      Open

      On

      Closed

      Off

      DOOR switch RL

      Rear door LH

      Open

      On

      Closed

      Off

      DOOR switch RR

      Rear door RH

      Open

      On

      Closed

      Off

    Is the inspection result normal?

    YES>>

    Door switch is OK.

    NO>>

    Refer to Diagnosis Procedure.

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK DOOR SWITCH INPUT SIGNAL

      1. Ignition switch OFF.

      2. Disconnect malfunctioning door switch connector.

      3. Check signal between malfunctioning door switch harness connector and ground using oscilloscope.

        (+)

        (–)

        Signal

        (Reference value)

        Door switch

        Connector

        Terminal

        Front LH

        B21

        3

        Ground

        7.0 - 8.0 V

        Front RH

        B28

        Rear LH

        B26

        Rear RH

        B41

    Is the inspection result normal?

    YES >>

    GO TO 3.

    NO >>

    GO TO 2.

  2. CHECK DOOR SWITCH CIRCUIT

      1. Disconnect BCM connector.

      2. Check continuity between door switch harness connector and BCM harness connector.

        Door switch

        BCM

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        Front LH

        B21

        3

        M85

        81

        Yes

        Front RH

        B28

        93

        Rear LH

        B26

        94

        Rear RH

        B41

        95

      3. Check continuity between door switch harness connector and ground.

        Door switch

        —

        Continuity

        Connector

        Terminal

        Front LH

        B21

        3

        Ground

        No

        Front RH

        B28

        Rear LH

        B26

        Rear RH

        B41

    Is the inspection result normal?

    YES >>

    Replace BCM. Refer to Removal and Installation.

    NO >>

    Repair or replace harness.

  3. CHECK DOOR SWITCH

    1. Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    Replace malfunctioning door switch. Refer to Removal and Installation.

  4. CHECK INTERMITTENT INCIDENT

    1. Refer to Intermittent Incident.

    >>

    Inspection End.

Component Inspection

Component Inspection

  1. CHECK DOOR SWITCH

      1. Ignition switch OFF.

      2. Disconnect malfunctioning door switch connector.

      3. Check continuity between door switch terminals.

        Door switch

        Condition

        Continuity

        Terminal

        3

        Ground contact is part of the switch.

        Door switch

        Pressed

        No

        Released

        Yes

    Is the inspection result normal?

    YES>>

    Inspection End.

    NO>>

    Replace malfunctioning door switch. Refer to Removal and Installation.

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