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Home >> Infiniti >> 2015 >> QX80 Base, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> Audio, Visual & Navigation System (BOSE Audio With Navigation) (Diagnostic Trouble Codes (DTCS) U1207-B272C, Symptom Tests And R & I) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> Headrest Display Unit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUSE

    Check for blown fuses.

    Power source Fuse No.
    Battery 35

    Is the inspection result normal?

    YES 

    GO TO STEP 2  .

    NO 

    Be sure to eliminate cause of malfunction before installing new fuse.

  2. CHECK POWER SUPPLY CIRCUIT

    Check voltage between headrest display unit harness connector and ground.

    Signal name Connector Terminal Ignition switch position Value (Approx.)
    Battery power supply B554* 1
    B574* 2    		 2 OFF Battery voltage
    4
    • * 1: Headrest display unit LH
    • * 2: Headrest display unit RH

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    Check harness between headrest display unit and fuse.

  3. CHECK GROUND CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect headrest display unit connector.
    3. Check continuity between headrest display unit harness connector and ground.
      Signal name Connector Terminal Ignition switch position Continuity
      Ground B554* 1
      B574* 2      		 1 OFF Existed
      3
    • * 1: Headrest display unit LH
    • * 2: Headrest display unit RH

    Is the inspection result normal?

    YES 

    INSPECTION END

    NO 

    Repair harness or connector.

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