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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 >> B257B, B257C Ambient 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 VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND
    1. Disconnect ambient sensor connector.
    2. Turn ignition switch ON.
    3. Check voltage between ambient sensor harness connector E211 terminal 1 and ground.

      1 - Ground: Approx. 5V 

      Fig 1: Checking Voltage Between Ambient Sensor Harness Connector E211 Terminal 1 And Ground
      G05875914Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: GO TO  4.

  2. CHECK CONTINUITY BETWEEN AMBIENT SENSOR AND A/C AUTO AMP.
    1. Turn ignition switch OFF.
    2. Disconnect A/C auto amp. connector.
    3. Check continuity between ambient sensor harness connector E211 (A) terminal 2 and A/C auto amp. harness connector M37 (B) terminal 37.

      2 - 37: Continuity should exist. 

      Fig 2: Checking Continuity Between Ambient Sensor Connector E211 Terminal 2 And A/C Auto Amp Connector M37 Terminal 37
      G05875915Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: Repair harness or connector.

  3. CHECK AMBIENT SENSOR

    Check ambient sensor. Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

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

    NO: Replace ambient sensor. Refer to "REMOVAL AND INSTALLATION ".

  4. CHECK CONTINUITY BETWEEN AMBIENT SENSOR AND A/C AUTO AMP.
    1. Turn ignition switch OFF.
    2. Disconnect A/C auto amp. connector.
    3. Check continuity between ambient sensor harness connector E211 (A) terminal 1 and A/C auto amp. harness connector M37 (B) terminal 35.

      1 - 35: Continuity should exist. 

      Fig 3: Checking Continuity Between Ambient Sensor Connector E211 Terminal 1 And A/C Auto Amp Connector M37 Terminal 35
      G05875916Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check continuity between ambient sensor harness connector E211 (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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