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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 999 (Heater & Air Conditioning Control System) >> With Monochrome Display >> Component Diagnosis >> B2578, B2579 In-Vehicle Sensor >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK IN-VEHICLE SENSOR POWER SUPPLY
    1. Disconnect in-vehicle sensor connector.
    2. Turn ignition switch ON.
    3. Check voltage between in-vehicle sensor harness connector M34 terminal 1 and ground.

      1 - Ground: Approx. 5V 

      Fig 1: Checking Voltage Between In-Vehicle Sensor Harness Connector M34 Terminal 1 And Ground
      G05875921Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: GO TO  4.

  2. CHECK CONTINUITY BETWEEN IN-VEHICLE SENSOR AND A/C AUTO AMP.
    1. Turn ignition switch OFF.
    2. Disconnect A/C auto amp. connector.
    3. Check continuity between in-vehicle sensor harness connector M34 (A) terminal 2 and A/C auto amp. harness connector M37 (B) terminal 37.

      2 - 37: Continuity should exist. 

      Fig 2: Checking Continuity Between In-Vehicle Sensor Connector M34 Terminal 2 And A/C Auto Amp Connector M37 Terminal 37
      G05875922Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: Repair harness or connector.

  3. CHECK IN-VEHICLE SENSOR

    Check in-vehicle sensor. Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: Replace A/C auto amp. Refer to "REMOVAL AND INSTALLATION ".

    NO: Replace in-vehicle sensor. Refer to "REMOVAL AND INSTALLATION ".

  4. CHECK CONTINUITY BETWEEN IN-VEHICLE SENSOR AND A/C AUTO AMP.
    1. Turn ignition switch OFF.
    2. Disconnect A/C auto amp. connector.
    3. Check continuity between in-vehicle sensor harness connector M34 (A) terminal 1 and A/C auto amp. harness connector M37 (B) terminal 36.

      1 - 36: Continuity should exist. 

      Fig 3: Checking Continuity Between In-Vehicle Sensor Connector M34 Terminal 1 And A/C Auto Amp Connector M37 Terminal 36
      G05875923Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check continuity between in-vehicle sensor harness connector M34 (A) terminal 1 and ground.

      1 - Ground: Continuity should not exist. 

    Is the inspection result normal? 

    YES: Replace A/C auto amp. Refer to "REMOVAL AND INSTALLATION ".

    NO: Repair harness or connector.

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