Diagnostic Procedure

SYMPTOM: Mode door motor does not operate normally. 

Fig 1: Identifying Diagnostic Procedure Circuit Of Mode Door Motor

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

1. CHECK BODY GROUND CIRCUIT FOR MODE DOOR MOTOR 
   Fig 2: Body Ground Circuit For Mode Door Motor Continuity Table

   Courtesy of NISSAN MOTOR CO., U.S.A.
   Fig 3: Checking Body Ground Circuit For Mode Door Motor

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

   Continuity should exist. 

   If OK, check harness for short.

   OK or NG 

   1. OK: GO TO 2.
   2. NG: Repair harness or connector.
2. CHECK CIRCUIT CONTINUITY BETWEEN EACH TERMINAL ON A/C CONTROL UNIT AND ON MODE DOOR MOTOR 
   Fig 4: A/C Control Unit Terminal And On Mode Door Motor Continuity Table

   Courtesy of NISSAN MOTOR CO., U.S.A.
   Fig 5: Checking Circuit Continuity Between Terminal On A/C Control Unit And On Mode Door Motor

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

   Continuity should exist. 

   If OK, check harness for short.

   OK or NG 

   1. OK: GO TO 3.
   2. NG: Repair harness or connector.
3. CHECK FOR A/C CONTROL UNIT OUTPUT 
   1. Reconnect mode door motor connector.
   2. Measure voltage across A/C control unit harness connector M51 terminals 9 (L/B) and 12 (L/R) while turning air control dial to each position.

      Voltage (V) : Approx. 12V 

   OK or NG 

   1. OK: Replace mode door motor.
   2. NG: Replace A/C control unit.
   Fig 6: Checking For A/C Control Unit Output

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