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Nissan Sentra B18 (2020-2025) Service Manual: B203d-14 Inside Antenna

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.

CONSULT screen items

(Trouble diagnosis content)

DTC detecting condition

B203D–14

Inside antenna

(Inside antenna)

Diagnosis condition

Work support “INSIDE/OUTSIDE ANT DIAGNOSIS”: activated

Signal (terminal)

Inside key antenna (trunk room) signal (Intelligent Key unit connector terminal: 33, 34)

Threshold

Inside key antenna (trunk room) circuit is shorted to ground

Diagnosis delay time

1 second or less

POSSIBLE CAUSE

  • Intelligent Key unit

  • Inside key antenna (trunk room)

  • Harness or connector (inside key antenna (trunk room) circuit is open or shorted)

FAIL-SAFE

–

Confirmation Procedure

Confirmation Procedure

  1. PERFORM DTC CONFIRMATION PROCEDURE

    1. CONSULT

      Select “Self Diagnosis Result” mode of “HANDS FREE MODULE”.

    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

DTC Diagnosis Procedure

  1. CHECK INSIDE KEY ANTENNA INPUT SIGNAL 1

      1. Ignition switch ON.

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

        (+)

        (–)

        Condition

        Signal

        (Reference value)

        Intelligent Key unit

        Connector

        Terminal

        M155

        33

        Ground

        Push-button ignition switch OFF

        When Intelligent Key is in the passenger compartment

        When Intelligent Key is not in the passenger compartment

        34

        When Intelligent Key is in the passenger compartment

        When Intelligent Key is not in the passenger compartment

    Is the inspection result normal?

    YES >>

    Replace Intelligent Key unit. Refer to Removal and Installation.

    NO >>

    GO TO 2.

  2. CHECK INSIDE KEY ANTENNA CIRCUIT

      1. Ignition switch OFF.

      2. Disconnect Intelligent Key unit connector and inside key antenna (trunk room) connector.

      3. Check continuity between Intelligent Key unit harness connector and inside key antenna (trunk room) harness connector.

        Intelligent Key unit

        Inside key antenna (trunk room)

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        M155

        33

        B49

        2

        Yes

        34

        1

      4. Check continuity between Intelligent Key unit harness connector and ground.

        Intelligent Key unit

        —

        Continuity

        Connector

        Terminal

        M155

        33

        Ground

        No

        34

    Is the inspection result normal?

    YES >>

    GO TO 3.

    NO >>

    Repair or replace harness.

  3. CHECK INSIDE KEY ANTENNA INPUT SIGNAL 2

      1. Replace inside key antenna (trunk room). (New antenna or other antenna)

      2. Connect Intelligent Key unit connector and inside key antenna (trunk room) connector.

      3. Ignition switch ON.

      4. Check signal between Intelligent Key unit harness connector and ground using oscilloscope.

        (+)

        (–)

        Condition

        Signal

        (Reference value)

        Intelligent Key unit

        Connector

        Terminal

        M155

        33

        Ground

        Push-button ignition switch OFF

        When Intelligent Key is in the passenger compartment

        When Intelligent Key is not in the passenger compartment

        34

        When Intelligent Key is in the passenger compartment

        When Intelligent Key is not in the passenger compartment

    Is the inspection result normal?

    YES >>

    Replace inside key antenna (trunk room). Refer to Removal and Installation.

    NO >>

    Replace Intelligent Key unit. Refer to Removal and Installation.

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