WARNING: This page is about a different car, the 2008 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK OPTICAL SENSOR INPUT SIGNAL
With CONSULT-III

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

Illuminated

OPTICAL SENSOR: 3.1 V 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-III

OK or NG

OK: Inspection End.

NG: GO TO 2.
CHECK OPTICAL SENSOR POWER SUPPLY 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 17 and optical sensor harness connector M15 terminal 1.
  17 - 1: Continuity should exist.
4. Check continuity (short circuit) between BCM harness connector M18 terminal 17 and ground.
  17 - Ground: Continuity should not exist.
Fig 1: Checking Continuity (Short Circuit) Between BCM Harness Connector M34 Terminal 17 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 3.

NG: Repair harness or connector.
CHECK OPTICAL SENSOR POWER SUPPLY CIRCUIT
1. Check continuity (open circuit) between BCM harness connector M18 terminal 14 and optical sensor harness connector M15 terminal 2.
  14 - 2: Continuity should exist.
2. Check continuity (short circuit) between BCM harness connector M18 terminal 14 and ground.
  14 - Ground: Continuity should not exist.
Fig 2: Checking Continuity (Short Circuit) Between BCM Harness Connector M34 Terminal 14 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 4.

NG: Repair harness or connector.
CHECK OPTICAL SENSOR POWER SUPPLY CIRCUIT
1. Check continuity (open circuit) between BCM harness connector M18 terminal 18 and optical sensor harness connector M15 terminal 3.
  18 - 3: Continuity should exist.
2. Check continuity (short circuit) between BCM harness connector M18 terminal 18 and ground.
  18 - Ground: Continuity should not exist.
Fig 3: Checking Continuity (Short Circuit) Between BCM Harness Connector M34 Terminal 18 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 5.

NG: Repair harness or connector.
CHECK OPTICAL SENSOR VOLTAGE
1. Connect BCM connector.
2. Turn ignition switch ON.
3. Check voltage between BCM harness connector M18 terminal 17 and ground.
  17 - Ground: Approx. 5V should exist.
Fig 4: Checking Voltage Between BCM Connector M18 Terminal 17 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

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

NG: Replace BCM. Refer to "BCM ".

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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