LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2008 >> QX56 AWD >> Repair and Diagnosis >> Body & Frame >> Windows >> Power Window Control System >> Component Diagnosis >> Encoder >> Driver Side >> DRIVER SIDE : Diagnosis Procedure >> Encoder Circuit Check
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Encoder Circuit Check

  1. CHECK ENCODER OPERATION
    1. Turn ignition switch ON.
    2. Check signal between main power window and door lock/unlock switch connector and ground with oscilloscope.
      SIGNAL REFERENCE

      Terminals Signal (Reference value)
      (+) (-)
      Main power window and door lock/unlock switch connector Terminal
      D7 9 Ground Refer to following signal
      13
      Fig 1: Identifying Signal Between Main Power Window And Door Lock/Unlock Switch Connector And Ground
      G05046757Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 2: Main Power Window Waveform Pulses
      G04888492Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".

    NO: GO TO 2

  2. CHECK FRONT POWER WINDOW MOTOR LH POWER SUPPLY
    1. Turn ignition switch ON.
    2. Check voltage between front power window motor LH connector and ground.
      VOLTAGE SPECIFICATION

      Terminal Voltage (V) (Approx.)
      (+) (-)
      Front power window motor LH connector Terminal
      D9 4 Ground 10
      Fig 3: Identifying Voltage Between Front Power Window Motor LH Connector And Ground
      G04902759Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the measurement value within the specification? 

    YES: GO TO  4

    NO: GO TO 3

  3. CHECK HARNESS CONTINUITY 1
    1. Turn ignition switch OFF.
    2. Disconnect main power window and door lock/unlock switch and front power window motor LH.
    3. Check continuity between main power window and door lock/unlock switch connector (A) and front power window motor LH connector (B).
      CONTINUITY SPECIFICATION

      Main power window and door lock/unlock switch connector Terminal Front power window motor LH connector Terminal Continuity
      D7 (A) 15 D9 (B) 4 Yes
      Fig 4: Identifying Continuity Between Main Power Window And Door Lock/Unlock Switch Connector (A) And Front Power Window Motor LH Connector (B)
      G05382342Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check continuity between main power window and door lock/unlock switch connector (A) and ground.
      CONTINUITY SPECIFICATION

      Main power window and door lock/unlock switch connector Terminal Ground Continuity
      D7 (A) 15 No

    Is the inspection result normal? 

    YES: Replace main power window and door lock/unlock switch. Refer to "REMOVAL AND INSTALLATION ".

    NO: Repair or replace harness.

  4. CHECK GROUND CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect front power window motor LH.
    3. Check continuity between front power window motor LH connector and ground.
      CONTINUITY SPECIFICATION

      Front power window motor LH connector Terminal Ground Continuity
      D9 6 Yes
      Fig 5: Identifying Continuity Between Front Power Window Motor LH Connector And Ground
      G04902751Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO  6

    NO: GO TO 5

  5. CHECK HARNESS CONTINUITY 2
    1. Disconnect main power window and door lock/unlock switch.
    2. Check continuity between main power window and door lock/unlock switch connector and front power window motor LH connector.
      CONTINUITY SPECIFICATION

      Main power window and door lock/unlock switch connector Terminal Front power window motor LH connector Terminal Continuity
      D7 2 D9 6 Yes
      Fig 6: Identifying Continuity Between Main Power Window And Door Lock/Unlock Switch Connector And Front Power Window Motor LH Connector
      G04902752Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: Replace main power window and door lock/unlock switch. Refer to "REMOVAL AND INSTALLATION ".

    NO: Repair or replace harness.

  6. CHECK HARNESS CONTINUITY 3
    1. Disconnect main power window and door lock/unlock switch.
    2. Check continuity between main power window and door lock/unlock switch connector (A) and front power window motor LH connector (B).
      CONTINUITY SPECIFICATION

      Main power window and door lock/unlock switch connector Terminal Front power window motor LH connector Terminal Continuity
      D7 (A) 9 D9 (B) 5 Yes
      13 3
    3. Check continuity between main power window and door lock/unlock switch connector (A) and ground.
      CONTINUITY SPECIFICATION

      Main power window and door lock/unlock switch connector Terminal Ground Continuity
      D7 (A) 9 No
      13
      Fig 7: Identifying Continuity Between Main Power Window And Door Lock/Unlock Switch Connector (A) And Front Power Window Motor LH Connector (B)
      G05382345Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: Replace front power window motor LH. Refer to "REMOVAL AND INSTALLATION ".

    NO: Repair or replace harness.

scientia non olet · About LEMON Manuals