Diagnostic Procedure For Ambient Sensor

SYMPTOM: Ambient sensor circuit is open or shorted. (21 or -21 is indicated on display and A/C auto amp. As a result of performing Self-diagnosis STEP-2.)

Fig 1: Diagnostic Procedure For Ambient Sensor

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

1. CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND 
   1. Disconnect ambient sensor connector.
   2. Turn ignition switch ON.
   3. Check voltage between ambient sensor harness connector E34 terminal 1 (Y/G) and ground.

      1 - Ground: Approx. 5V 

      Fig 2: Checking Voltage Between Ambient Sensor And Ground

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

   OK or NG 

   1. OK: GO TO 2.
   2. NG: GO TO  4.
2. CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND DISPLAY AND A/C AUTO AMP. 
   1. Turn ignition switch OFF.
   2. Disconnect display and A/C auto amp. connector.
   3. Check continuity between ambient sensor harness connector E34 terminal 2 (W/G) and display and A/C auto amp. harness connector M31 terminal 11 (W/G).

      2 - 11: Continuity should exist. 

      Fig 3: Checking Circuit Continuity Between Ambient Sensor And Display And A/C Auto Amp

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

   OK or NG 

   1. OK: GO TO 3.
   2. NG: Repair harness or connector.
3. CHECK AMBIENT SENSOR 

   Refer to "AMBIENT SENSOR ".

   OK or NG 

   1. OK: Go to next step.
      1. Replace display and A/C auto amp.
      2. Go to self-diagnosis "FUNCTION CONFIRMATION PROCEDURE " and perform self-diagnosis STEP-2. Confirm that code No. 20 is displayed.
   2. NG: Go to next step.
      1. Replace ambient sensor.
      2. Go to self-diagnosis "FUNCTION CONFIRMATION PROCEDURE " and perform self-diagnosis STEP-2. Confirm that code No. 20 is displayed.
4. CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND DISPLAY AND A/C AUTO AMP. 
   1. Turn ignition switch OFF.
   2. Disconnect display and A/C auto amp. connector.
   3. Check continuity between ambient sensor harness connector E34 terminal 1 (Y/G) and display and A/C auto amp. harness connector M31 terminal 2 (Y/G).

      1 - 2: Continuity should exist. 

      Fig 4: Checking Circuit Continuity Between Ambient Sensor And Display And A/C Auto Amp

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

   OK or NG 

   1. OK: Go to next step.
      1. Replace display and A/C auto amp.
      2. Go to self-diagnosis "FUNCTION CONFIRMATION PROCEDURE " and perform self-diagnosis STEP-2. Confirm that code No. 20 is displayed.
   2. NG: Repair harness or connector.