Nissan Murano: Dtc/circuit Diagnosis / U1a0b Mic in Conn

Nissan Murano (Z52) 2015-2024 Service Manual / Driver Information & Multimedia / Audio, Visual & Navigation System :: Telematics System / Dtc/circuit Diagnosis / U1a0b Mic in Conn

DTC Description

DTC DETECTION LOGIC

DTC No.

CONSULT screen terms

(Trouble diagnosis content)
DTC detection condition
U1A0B

MIC IN CONN

(MIC in conn)
Diagnosis condition When ignition switch is ON.
Signal (terminal)
Threshold No input of microphone circuits
Diagnosis delay time

POSSIBLE CAUSE

  • Harness or connectors

  • Microphone

  • TCU

FAIL-SAFE

  • Transmit an own vehicle position to the NissanConnect center

  • Inform a NissanConnect center about abnormality

DTC Confirmation Procedure

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

  1. Ignition switch ON.

  2. Select “Self Diagnostic Result” mode of “TELEMATICS”.

  3. Check DTC.

Is DTC U1A0B detected?

YES>>

Proceed to DTC Diagnosis Procedure.

NO>>

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

NO>>

Confirmation after repair: Inspection End.

Diagnosis Procedure

CHECK MIC IN SIGNAL CIRCUIT AND MIC VCC CIRCUIT CONTINUITY

  1. Ignition switch OFF.

  2. Disconnect TCU connector and microphone connector.

  3. Check continuity between TCU connector and microphone connector.

    TCU Microphone Continuity
    Connector Terminal Connector Terminal
    M126 17 R8 1 Yes
    18 4
  4. Check the continuity between TCU connector and ground.

    TCU Ground Continuity
    Connector Terminal
    M126 17 No
    18

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Repair or replace harness or connectors.

CHECK MIC VCC VOLTAGE

  1. Connect TCU connector and microphone connector.

  2. Ignition switch ON.

  3. Check voltage between terminals of TCU connector.

    TCU

    Voltage

    (Approx.)
    Connector (+) (−)
    Terminal Terminal
    M126 18 28 5.0 V

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Replace TCU. Refer to Removal and Installation.

CHECK MIC IN SIGNAL

Check signal between terminals of TCU connector.

TCU Condition Reference value
Connector (+) (−)
Terminal Terminal
M126 17 28 Speak into microphone.

Is the inspection result normal?

YES>>

Replace TCU. Refer to Removal and Installation.

NO>>

Replace microphone. Refer to Removal and Installation.

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