Diagnostic Procedure For Optical Sensor

SYMPTOM: Optical sensor circuit is open or shorted. Using the CONSULT-II, DTC B257F or B2580 is displayed. Without a CONSULT-II, code 50 or 52 is indicated on front air control as a result of conducting the front air control self-diagnosis.

Fig 1: Optical Sensor Circuit Diagram

Courtesy of NISSAN MOTOR CO., U.S.A.

1. CHECK OPTICAL SENSOR (DRIVER) CIRCUIT VOLTAGE 
   1. Turn ignition switch OFF.
   2. Disconnect optical sensor connector.
   3. Turn ignition switch ON.
   4. Check voltage between optical sensor harness connector M16 terminal 1 and ground.
      VOLTAGE CHART
      
      

      Connector	Terminals		Voltage (Approx.)
      	(+)	(-)
      Optical sensor: M16	1	Ground	5V

      Fig 2: Checking Voltage Between Optical Sensor Harness Connector M16 Terminal 1 And Ground

      Courtesy of NISSAN MOTOR CO., U.S.A.

   OK or NG 

   OK: GO TO 2.

   NG: GO TO  5.

2. CHECK OPTICAL SENSOR (PASSENGER) CIRCUIT VOLTAGE 

   Check voltage between optical sensor harness connector M16 terminal 2 and ground.

   VOLTAGE CHART
   
   

   Connector	Terminals		Voltage (Approx.)
   	(+)	(-)
   Optical sensor: M16	2	Ground	5V

   OK or NG 

   OK: GO TO 3.

   NG: GO TO  6.

   Fig 3: Checking Voltage Between Optical Sensor Harness Connector M16 Terminal 2 And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. CHECK OPTICAL SENSOR GROUND CIRCUIT 
   1. Turn ignition switch OFF.
   2. Check continuity between optical sensor harness connector M16 terminal 3 and ground.

      Continuity should exist. 

   OK or NG 

   OK: Replace optical sensor. Refer to "OPTICAL SENSOR ".

   NG: GO TO 4.

   Fig 4: Checking Continuity Between Optical Sensor Harness Connector M16 Terminal 3 And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. CHECK CIRCUIT CONTINUITY BETWEEN OPTICAL SENSOR AND BCM 
   1. Disconnect BCM.
   2. Check continuity between optical sensor harness connector M16 (B) terminal 3 and BCM harness connector M18 (A) terminal 18.

      Continuity should exist. 

   OK or NG 

   OK: Replace BCM. Refer to "REMOVAL AND INSTALLATION OF BCM ".

   NG: Repair harness or connector.

   Fig 5: Checking Continuity Between Optical Sensor Harness Connector M16 (B) Terminal 3 And BCM Harness Connector M18 (A) Terminal 18

   Courtesy of NISSAN MOTOR CO., U.S.A.
5. CHECK OPTICAL SENSOR (DRIVER) CIRCUIT FOR OPEN OR SHORTED 
   1. Turn ignition switch OFF.
   2. Disconnect front air control connector.
   3. Check continuity between optical sensor harness connector M16 (B) terminal 1 and front air control harness connector M49 (A) terminal 1.

      Continuity should exist. 

   4. Check continuity between optical sensor harness connector M16 (B) terminal 1 and ground.
      Fig 6: Checking Continuity Between Optical Sensor Harness Connector M16 (B) Terminal 1 And Front Air Control Harness Connector M49 (A) Terminal 1, And Between Connector M16 Terminal 1 And Ground

      Courtesy of NISSAN MOTOR CO., U.S.A.

      Continuity should not exist. 

   OK or NG 

   OK: Replace front air control. Refer to "FRONT AIR CONTROL ".

   NG: Repair harness or connector.

6. CHECK OPTICAL SENSOR (PASSENGER) CIRCUIT FOR OPEN AND SHORTED 
   1. Turn ignition switch OFF.
   2. Disconnect front air control connector.
   3. Check continuity between optical sensor harness connector M16 (B) terminal 2 and front air control harness connector M50 (A) terminal 42.

      Continuity should exist. 

      Fig 7: Checking Continuity Between Optical Sensor Harness Connector M16 Terminal 2 And Connector M50 Terminal 42, And Between Connector M16 Terminal 2 And Ground

      Courtesy of NISSAN MOTOR CO., U.S.A.
   4. Check continuity between optical sensor harness connector M16 (B) terminal 2 and ground.

      Continuity should not exist. 

   OK or NG 

   OK: Replace front air control. Refer to "FRONT AIR CONTROL ".

   NG: Repair harness or connector.