Optical sensor System Inspection

WARNING: This page is about a different car, the 2005 Infiniti FX45 and 2005 Infiniti FX35. 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 "HEAD LAMP" data monitor, make sure "OPTICAL SENSOR", check difference in the voltage when auto light sensor is illuminated and not illuminated.
1. Illuminated
2. OPTICAL SENSOR: 3.1 V or more
3. Not illuminated
4. OPTICAL SENSOR: 0.6V or less
  
  Fig 1: CONSULT-II Diagnosis Function Display (2 Of 2)
  Courtesy of NISSAN MOTOR CO., U.S.A.
CAUTION: Optical sensor must be securely subjected to work lamp light. If optical sensor is insufficiently illuminated, the measured value may not satisfy the standard.

Without CONSULT-II
1. Turn ignition switch ON.
2. Check voltage between BCM harness connector M3 terminal 14 (P) and ground.
  1. Illuminated
  2. OPTICAL SENSOR: 3.1 V or more
  3. Not illuminated
  4. OPTICAL SENSOR: 0.6V or less
  Fig 2: Checking Voltage Between BCM Harness Connector M3 Terminal 14 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
CAUTION: Optical sensor must be securely subjected to work lamp light. If optical sensor is insufficiently illuminated, the measured value may not satisfy the standard.

OK or NG
1. OK: INSPECTION END
2. 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 M3 terminal 17 (Y/G) and optical sensor harness connector M37 terminal 1 (Y/G).
  1. 17 (Y/G) - 1 (Y/G): Continuity should exist.
4. Check continuity (short circuit) between BCM harness connector M3 terminal 17 (Y/G) and ground.
  1. 17 (Y/G) - Ground: Continuity should not exist.
  Fig 3: Checking Continuity Between BCM Harness Connector M3 Terminal 17 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 3.
2. NG: Repair harness or connector.
CHECK OPTICAL SENSOR SIGNAL CIRCUIT
1. Check continuity (open circuit) between BCM harness connector M3 terminal 14 (P) and optical sensor harness connector M37 terminal 2 (P).
  1. 14 (P) - 2 (P): Continuity should exist.
2. Check continuity (short circuit) between BCM harness connector M3 terminal 14 (P) and ground.
  1. 14 (P) - Ground: Continuity should not exist.
  Fig 4: Checking Continuity Between BCM Harness Connector M3 Terminal 14 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 4.
2. NG: Repair harness or connector.
CHECK OPTICAL SENSOR GROUND CIRCUIT
1. Check continuity (open circuit) between BCM harness connector M3 terminal 18 (B) and optical sensor harness connector M37 terminal 3 (B).
  1. 18 (B) - 3 (B): Continuity should exist.
2. Check continuity (short circuit) between BCM harness connector M3 terminal 18 (B) and ground.
  1. 18 (B) - Ground: Continuity should not exist.
  Fig 5: Checking Continuity Between BCM Harness Connector M3 Terminal 18 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 5.
2. 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 M3 terminal 17 (Y/G) and ground.
  1. 17 (Y/G) - Ground: Approx. 5V
OK or NG
1. OK: Replace optical sensor.
2. NG: Replace BCM. Refer to "REMOVAL AND INSTALLATION OF BCM ".
Fig 6: Checking Voltage Between BCM Harness Connector M3 Terminal 17 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.