LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2004 >> QX56 RWD >> Repair and Diagnosis (Single Page) >> Body & Frame >> Windows >> Power Window System >> Power Window System >> Encoder Circuit Check Front LH
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Encoder Circuit Check Front LH

  1. CHECK FRONT POWER WINDOW MOTOR LH POWER SUPPLY 
    1. Turn ignition switch OFF.
    2. Disconnect front power window motor LH.
    3. Turn ignition switch ON.
    4. Check voltage between front power window motor LH connector D9 terminal 4 and ground.
        Fig 1: Checking Voltage Between Front Power Window Motor And Ground
        G02468598Courtesy of NISSAN MOTOR CO., U.S.A.
      1. 4 (BR) - Ground: Approx. 10V 

    OK or NG

    1. OK: GO TO   3  . 
    2. NO: GO TO   2  . 
  2. CHECK HARNESS CONTINUITY 
    1. Turn ignition switch OFF.
    2. Disconnect front power window motor LH and main power window and door lock/unlock switch.
    3. Check continuity between front power window motor LH connector D9 terminal 4 and main power window and door lock/unlock switch connector D7 terminal 15.
      Fig 2: Checking Continuity Between Front Power Window Motor And Main Power Window And Door Lock/Unlock Switch
      G02468599Courtesy of NISSAN MOTOR CO., U.S.A.
      1. 4 (BR) -15 (BR): Continuity should exist. 

    OK or NG

    1. OK: Replace main power window and door lock/unlock switch.
    2. NG: Repair or replace harness.
  3. CHECK ENCODER GROUND 
    1. Turn ignition switch OFF.
    2. Disconnect front power window motor LH.
    3. Check continuity between front power window motor LH connector D9 terminal 6 and ground.
      Fig 3: Checking Continuity Between Front Power Window Motor And Ground
      G02468600Courtesy of NISSAN MOTOR CO., U.S.A.
      1. 6 (W/B) - Ground: Continuity should exist. 

    OK or NG

    1. OK: GO TO  5 .
    2. NG: GO TO 4.
  4. CHECK ENCODER GROUND CIRCUIT 
    1. Disconnect main power window and door lock/unlock switch.
    2. Check continuity between front power window motor LH connector D9 terminal 6 and main power window and door lock/unlock switch connector D7 terminal 2.
      Fig 4: Checking Continuity Between Front Power Window Motor And Main Power Window And Door Lock/Unlock Switch
      G02468601Courtesy of NISSAN MOTOR CO., U.S.A.
      1. 6 (W/B) - 2 (W/B): Continuity should exist. 

    OK or NG

    1. OK: Replace main power window and door lock/unlock switch.
    2. NG: Repair or replace harness.
  5. CHECK ENCODER SIGNAL 
    1. Connect front power window motor LH.
    2. Turn ignition switch ON.
    3. Check the signal between main power window and door lock/unlock switch connector and ground with oscilloscope.
      Fig 5: Connector Terminal Specifications
      G02468602Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 6: Checking Signal Between Main Power Window And Door Lock/Unlock Switch Connector And Ground With Oscilloscope
      G02468603Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: Replace main power window and door lock/unlock switch.
    2. NG: GO TO 6.
  6. CHECK ENCODER CIRCUIT 
    1. Turn ignition switch OFF
    2. Disconnect front power window motor LH and main power window and door lock/unlock switch.
    3. Check continuity between front power window motor LH connector D9 terminal 3 and main power window and door lock/unlock switch connector D7 terminal 13.
      Fig 7: Checking Continuity Between Front Power Window Motor And Main Power Window And Door Lock/Unlock Switch
      G02468604Courtesy of NISSAN MOTOR CO., U.S.A.
      1. 3 (G/Y) - 13 (G/Y): Continuity should exist. 

    OK or NG

    1. OK: Replace front power window motor LH.
    2. NG: Repair or replace harness.
scientia non olet · About LEMON Manuals