2002 Nissan-Datsun Sentra SE-R, StandardFACTORY OEM SERVICE PROCEDURE

Optical Sensor System Inspection

WARNING: This page is about a different car, the 2004 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK OPTICAL SENSOR INPUT SIGNAL 

    With CONSULT-II

    Select "BCM" on CONSULT-II. With "OPTICAL SENSOR" data monitor, check difference in the voltage when the optical sensor is illuminated and not illuminated.

    Illuminated OPTICAL SENSOR: 3.0V or less 

    Not illuminated OPTICAL SENSOR: 3.1 V or more 

    CAUTION: Optical sensor must be completely subjected to work lamp light. If the optical sensor is insufficiently illuminated, the measured value may not satisfy the standard.

    Without CONSULT-II

    GO TO 2.

    OK or NG

    1. OK: INSPECTION END.
    2. NG: GO TO 2.
      Fig 1: CONSULT-II Function Display OPTICAL SENSOR
      G03500524Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK OPTICAL SENSOR SIGNAL GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect BCM connector and optical sensor connector.
    3. Check continuity (open circuit) between BCM harness connector M18 terminal 18 (P) and optical sensor harness connector M402 terminal 3 (P).
      1. 18 (P) - 3 (P): Continuity should exist. 
    4. Check continuity (short circuit) between BCM harness connector M18 terminal 18 (P) and ground.
      1. 18 (P) - Ground: Continuity should not exist. 

    OK or NG

    1. OK: GO TO 3.
    2. NG: Repair harness or connector.
    Fig 2: Checking Continuity Between BCM Harness Connector M18 Terminal 18 (P) & Ground
    G03500525Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK OPTICAL SENSOR SIGNAL CIRCUIT 
    1. Check continuity (open circuit) between BCM harness connector M19 terminal 43 (W/R) and optical sensor harness connector M402 terminal 4 (W/R).
      1. 43 (W/R) - 4 (W/R): Continuity should exist. 
    2. Check continuity (short circuit) between BCM harness connector M19 terminal 43 (W/R) and ground.
      1. 43 (W/R) - Ground: Continuity should not exist. 

    OK or NG

    1. OK: Replace optical sensor. Refer to "REMOVAL AND INSTALLATION OF OPTICAL SENSOR ". Recheck sensor output with CONSULT-II. If NG, replace BCM. Refer to REMOVAL AND INSTALLATION OF BCM .
    2. NG: Repair harness or connector.
    Fig 3: Checking Continuity Between BCM Harness Connector M19 Terminal 43 (W/R) & Ground
    G03500526Courtesy of NISSAN MOTOR CO., U.S.A.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.