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Diagnosis Procedure For A/C Display

WARNING: This page is about a different car, the 2008 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM: A/C display inoperative.

Fig 1: A/C Display Inoperative Diagnosis Circuit
G04917637Courtesy of NISSAN MOTOR CO., U.S.A.
  1. CHECK FOR UNIFIED METER AND A/C AMP. OUTPUT 
    1. Disconnect the front air control.
    2. Turn ignition switch ON.
    3. Check multiplex communication signal between unified meter and A/C amp. harness connector M49 terminal 10 and ground using an oscilloscope.
    UNIFIED METER AND A/C AMP. HARNESS CONNECTOR M49 TERMINAL 10 AND GROUND

    Terminal Voltage
    (+) (-)
    Unified meter and A/C amp. connector Terminal No.
    M49 10 Ground
    G04917631Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 2: Checking Unified Meter And A/C Amp. Output Connector Terminal
    G04917632Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  3.

    NG: GO TO  2.

  2. CHECK CIRCUIT CONTINUITY BETWEEN A/C DISPLAY AND UNIFIED METER AND A/C AMP  .
    1. Turn ignition switch OFF.
    2. Disconnect A/C display connector and unified meter and A/C amp. connector.
    3. Check continuity between A/C display harness connector M118 (B) terminal 3 and unified meter and A/C amp. harness connector M49 (A) terminal 10.

      3 - 10: Continuity should exist  .

    Fig 3: Checking Continuity Between A/C Display And Unified Meter And A/C Amp. Connector Terminal
    G04917640Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Replace unified meter and A/C amp. Refer to "UNIFIED METER AND A/C AMP ".

    NG: Repair harness or connector.

  3. CHECK POWER SUPPLY CIRCUIT FOR A/C DISPLAY 
    1. Turn ignition switch OFF.
    2. Disconnect A/C display.
    3. Turn ignition switch ON.
    4. Check voltage between A/C display harness connector M118 terminal 1 and ground.
    POWER SUPPLY CIRCUIT FOR A/C DISPLAY

    Terminals Ignition switch position
    (+) (-) OFF ON
    A/C display Terminal No.
    M118 1 Ground Approx. 0V Battery voltage
    Fig 4: Checking Voltage Between A/C Display Harness Connector M118 Terminal 1 And Ground
    G04917641Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  4.

    NG: Repair harness or connector as necessary

  4. CHECK GROUND CIRCUIT FOR A/C DISPLAY 
    1. Turn ignition OFF.
    2. Check continuity between A/C display harness connector M118 terminal 7 and ground.

      7 - Ground: Continuity should exist  .

    Fig 5: Checking Continuity Between A/C Display Harness Connector M118 Terminal 7 And Ground
    G04917642Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Replace A/C display. Refer to "CENTER STACK ASSEMBLY "

    NG: Repair harness or connector.

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