WARNING: This page is about a different car, the 2005 Nissan Frontier. 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.

Illuminated

OPTICAL SENSOR: 3.1V or more

Not illuminated

OPTICAL SENSOR: 0.6V or less

NOTE: 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.
  
  Fig 1: CONSULT-II Scan Display - DATA MONITOR
  Courtesy of NISSAN MOTOR CO., U.S.A.
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 and optical sensor harness connector M14 terminal 3.
  18 - 3: Continuity should exist.
4. Check continuity (short circuit) between BCM harness connector M18 terminal 18 and ground.
  18 - Ground: Continuity should not exist.
OK or NG
- OK: GO TO 3.
- NG: Repair harness or connector.
  
  Fig 2: Checking Continuity Between BCM Harness Connector M18 Terminal 18 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK OPTICAL SENSOR SIGNAL CIRCUIT
1. Check continuity (open circuit) between BCM harness connector M20 terminal 58 and optical sensor harness connector M14 terminal 4.
  58 - 4: Continuity should exist.
2. Check continuity (short circuit) between BCM harness connector M20 terminal 58 and ground.
  58 - 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.
  
  Fig 3: Checking Optical Sensor Signal Circuit
  Courtesy of NISSAN MOTOR CO., U.S.A.

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

Rather have a pro handle this?