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Diagnostic Procedure For Optical Sensor

WARNING: This page is about a different car, the 2007 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. (50 or 52 is indicated on front air control display as a result of conducting self-diagnosis).

Fig 1: Inspecting Optical Sensor
G04913491
  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.
      CONTINUITY REFERENCE CHART

      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 Terminal 1 And 2 And Connector M50 (A) Terminal 37 And 29
      G04913492
    4. Check continuity between optical sensor harness connector M145 (B) terminal 1 and 2 and ground.
      CONTINUITY REFERENCE CHART

      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.
      CONTINUITY REFERENCE CHART

      A B  
      Connector Terminal Connector Terminal Continuity
      BCM: M18 18 Optical sensor: M145 3 Yes
    4. Check continuity between optical sensor harness connector M145 (B) terminal 3 and ground.
      CONTINUITY REFERENCE CHART

      B   Continuity
      Connector Terminal Ground No
      Optical Sensor: M145 3
      Fig 3: Checking Continuity Between Harness Connector M145 Terminal 3 And BCM Harness Connector M18 (A) Terminal 18
      G04913493

    OK or NG 

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

    NG: Repair harness or connector.

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