WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

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.

Fig 1: Displaying OPTICAL SENSOR On DATA MONITOR Mode
Courtesy of NISSAN MOTOR CO., U.S.A.

Illuminated OPTICAL SENSOR: 3.0V or less

Not illuminated OPTICAL SENSOR: 3.1V 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
- OK: Inspection End.
- NG: GO TO 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).
  18 (P) - 3 (P): Continuity should exist.
4. Check continuity (short circuit) between BCM harness connector M18 terminal 18 (P) and ground.
  
  Fig 2: Checking Continuity (Short Circuit) Between BCM Harness Connector M18 Terminal 18 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  18 (P) - Ground: Continuity should not exist.
OK or NG
- OK: GO TO 3.
- NG: Repair harness or connector.
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).
  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.
  
  Fig 3: Checking Continuity (Short Circuit) Between BCM Harness Connector M19 Terminal 43 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  43 (W/R) - Ground: Continuity should not exist.
OK or NG
- 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 ".
- NG: Repair harness or connector.

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.

Safety Warning

Optical Sensor System Inspection

Use the Manual With the Right Hardware

When to See a Mechanic

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