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Diagnostic Procedure For Optical Sensor

WARNING: This page is about a different car, the 2006 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM: Optical sensor circuit is open or shorted. (44 or 46 is indicated on front air control display as a result of conducting selfdiagnosis).

Fig 1: Optical Sensor Circuit Diagram
G04176579Courtesy of NISSAN MOTOR CO., U.S.A.
  1. CHECK CIRCUIT CONTINUITY BETWEEN OPTICAL SENSOR AND FRONT AIR CONTROL 
    1. Turn ignition switch OFF.
    2. Disconnect front air control connector and optical sensor connector.
    3. Check continuity between optical sensor harness connector M145 (B) terminal 1 and 2 and front air control harness connector M50 (A) terminal 37 and 29.
      CIRCUIT CONTINUITY BETWEEN OPTICAL SENSOR AND FRONT AIR CONTROL

      A B  
      Connector Terminal Connector Terminal Continuity
      Front air control: M50 29 Optical sensor: M145 2 Yes
      Front air control: M50 37 Optical sensor: M145 1 Yes
      Fig 2: Checking Continuity Between Harness Connector M145 (B) Terminal 1 And 2 And Connector M50 (A) Terminal 37 And 29
      G04176580Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check continuity between optical sensor harness connector M145 (B) terminal 1 and 2 and ground.
    OPTICAL SENSOR HARNESS CONNECTOR M145 (B) TERMINAL 1 AND 2 AND GROUND

    B   Continuity
    Connector Terminal Ground  
    Optical sensor: M145 1 No
    Optical sensor: M145 2 No

    OK or NG 

    OK: GO TO 2.

    NG: Repair harness or connector.

  2. CHECK CIRCUIT CONTINUITY BETWEEN OPTICAL SENSOR AND BCM 
    1. Turn ignition switch OFF.
    2. Disconnect BCM connector and optical sensor connector.
    3. Check continuity between optical sensor harness connector M145 (B) terminal 3 and BCM harness connector M18 (A) terminal 18.
      CIRCUIT CONTINUITY BETWEEN OPTICAL SENSOR AND BCM

      A B  
      Connector Terminal Connector Terminal Continuity
      BCM: M18 18 Optical sensor: M145 3 Yes
      Fig 3: Checking Continuity Between Harness Connector M145 (B) Terminal 3 And BCM Harness Connector M18 (A) Terminal 18
      G04176581Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check continuity between optical sensor harness connector M145 (B) terminal 3 and ground.
    OPTICAL SENSOR HARNESS CONNECTOR M145 (B) TERMINAL 3 AND GROUND

    B   Continuity
    Connector Terminal Ground No
    Optical Sensor: M145 3

    OK or NG 

    OK: Replace optical sensor. Refer to "OPTICAL SENSOR ".

    NG: Repair harness or connector.

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