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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1074 (Exterior Lighting System) >> DTC/Circuit Diagnosis >> Optical Sensor >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

  1. CHECK OPTICAL SENSOR GROUND CIRCUIT
    1. Turn the ignition switch OFF.
    2. Disconnect BCM connector M18 and optical sensor connector M145.
    3. Check continuity between BCM harness connector and optical sensor harness connector.
      BCM Optical sensor Continuity
      Connector Terminal Connector Terminal
      M18 18 M145 3 Yes
    4. Check continuity between BCM harness connector and ground.
      BCM - Continuity
      Connector Terminal
      M18 18 Ground No

      Are continuity results as specified? 

      YES: GO TO 2

      NO: Repair harness or connector.

  2. CHECK OPTICAL SENSOR SIGNAL CIRCUIT
    1. Check continuity between BCM harness connector and optical sensor harness connector.
      BCM Optical sensor Continuity
      Connector Terminal Connector Terminal
      M20 58 M145 4 Yes
    2. Check continuity between BCM harness connector M20 and ground.
      BCM - Continuity
      Connector Terminal
      M20 58 Ground No

      Are the continuity results as specified? 

      YES: Replace the optical sensor. Refer to "REMOVAL AND INSTALLATION ".

      NO: Repair harness or connector.

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