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Encoder Circuit Check

WARNING: This page is about a different car, the 2008 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK ENCODER SIGNAL
    1. Turn ignition switch ON.
    2. Check the signal between rear power window control unit RH connector D309 terminal 4 and ground with oscilloscope.
      SIGNAL REFERENCE

      Connector Terminals Condition Signal
      (+) (-)
      D309 4 Ground Opening
      G05742469Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 1: Identifying Signal Between Rear Power Window Control Unit RH Connector D309 Terminal 4 And Ground
      G05231119Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 2

    NG: Replace rear power window control unit RH.

  2. CHECK HARNESS CONTINUITY
    1. Turn ignition switch OFF.
    2. Disconnect rear power window control unit RH and rear power window motor RH.
    3. Check continuity between rear power window control unit RH connector D309 terminal 4 and rear power window motor RH connector D304 terminal 3.

      4 - 3 : Continuity should exist. 

    OK or NG 

    OK: GO TO 3

    NG: Repair or replace harness.

    Fig 2: Identifying Continuity Between Rear Power Window Control Unit RH Connector And Rear Power Window Motor RH Connector
    G05231120Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK REAR POWER WINDOW MOTOR RH POWER SUPPLY
    1. Turn ignition switch OFF.
    2. Disconnect rear power window motor RH.
    3. Turn ignition switch ON.
    4. Check voltage between rear power window motor RH connector D304 terminal 4 and ground.

      4 - Ground : Approx. 10V 

    OK or NG 

    OK: GO TO  5

    NG: GO TO 4

    Fig 3: Identifying Voltage Between Rear Power Window Motor RH Connector D304 Terminal 4 And Ground
    G04917129Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK HARNESS CONTINUITY
    1. Turn ignition switch OFF.
    2. Disconnect rear power window motor RH and rear power window control unit RH.
    3. Check continuity between rear power window motor RH connector D304 (B) terminal 4 and rear power window control unit RH connector D309 (A) terminal 5.

      4 - 5 : Continuity should exist. 

    OK or NG 

    OK: Replace rear power window switch RH. Refer to "REMOVAL AND INSTALLATION ".

    NG: Repair or replace harness.

    Fig 4: Identifying Continuity Between Rear Power Window Motor RH Connector And Rear Power Window Control Unit RH Connector
    G05231115Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK ENCODER GROUND
    1. Disconnect rear power window motor RH.
    2. Check continuity between rear power window motor RH connector D304 terminal 6 and ground.

      6 - Ground : Continuity should exist. 

    OK or NG 

    OK: GO TO  7

    NG: GO TO 6

    Fig 5: Identifying Continuity Between Rear Power Window Motor RH Connector D304 Terminal 6 And Ground
    G04917131Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK ENCODER GROUND CIRCUIT
    1. Disconnect rear power window control unit RH.
    2. Check continuity between rear power window motor RH connector D304 terminal 6 and rear power window control unit RH connector D309 terminal 3.

      6 - 3 : Continuity should exist. 

    OK or NG 

    OK: Replace rear power window control unit RH.

    NG: Repair or replace harness.

    Fig 6: Identifying Continuity Between Rear Power Window Motor RH Connector And Rear Power Window Control Unit RH Connector
    G05231111Courtesy of NISSAN MOTOR CO., U.S.A.
  7. CHECK REAR POWER WINDOW MOTOR RH LIMIT SWITCH SIGNAL
    1. Turn ignition switch ON.
    2. Check voltage between rear power window control unit RH connector and ground.
      VOLTAGE SPECIFICATION

      Connector Terminals Condition Voltage (V) (Approx.)
      (+) (-)
      D209 3 Ground Rear power window RH is between fully-open and just before fully-closed position (ON) 0
      Rear power window RH is between just before fully-closed position and fully-closed position (OFF) 5
      Fig 7: Identifying Voltage Between Rear Power Window Control Unit RH Connector And Ground
      G05231109Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Limit switch circuit is OK.

    NG: GO TO 8

  8. CHECK REAR POWER WINDOW SWITCH RH OUTPUT SIGNAL
    1. Turn ignition switch ON.
    2. Check voltage between rear power window control unit RH harness connector D309 terminal 2 and ground.

      2 - Ground : Approx. 5V 

    OK or NG 

    OK: GO TO 9

    NG: Replace rear power window control unit RH.

    Fig 8: Identifying Voltage Between Rear Power Window Control Unit RH Harness Connector D309 Terminal 2 And Ground
    G05231112Courtesy of NISSAN MOTOR CO., U.S.A.
  9. CHECK HARNESS CONTINUITY
    1. Turn ignition switch OFF.
    2. Disconnect rear power window control unit RH.
    3. Check continuity between rear power window control unit RH connector D309 terminal 2 and rear power window motor RH connector D304 terminal 5.

      2 - 5 : Continuity should exist. 

    OK or NG 

    OK: Replace rear power window motor RH. Refer to "REMOVAL AND INSTALLATION ".

    NG: Repair or replace harness.

    Fig 9: Identifying Continuity Between Rear Power Window Control Unit RH Connector And Rear Power Window Motor RH Connector
    G05231113Courtesy of NISSAN MOTOR CO., U.S.A.
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