2015 Nissan-Datsun Altima BaseFACTORY OEM SERVICE PROCEDURE

Driver Side - Encoder Circuit Check

  1. CHECK ENCODER OPERATION

    1. Connect front power window motor LH.
    2. Turn ignition switch ON.
    3. Check signal between main power window and door lock/unlock switch connector D12 and ground with oscilloscope.
      Terminals Signal
      (Reference value)
      (+) (-)
      Main power window and door lock/unlock switch connector Terminal
      D12 4 Ground Refer to following signal
      5
      Fig 1: Main Power Window And Door Lock/Unlock Switch Encoder Signal (1 And 2)
      G08686851Courtesy of NISSAN NORTH AMERICA, INC.

    Is the inspection result normal? 

    YES:  Check intermittent incident. Refer to INTERMITTENT INCIDENT .

    NO:  GO TO STEP 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 D9 and ground.
      Terminal Voltage
      (Approx.)
      (+) (-)
      Front power window motor LH connector Terminal
      D9 2 Ground 10

    Is the inspection result normal? 

    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 D12 and front power window motor connector D9.
      Main power window and door lock/unlock switch connector Terminal Front power window motor LH connector Terminal Continuity
      D12 14 D9 2 Yes
    4. Check continuity between main power window and door lock/unlock switch connector D12 and ground.
      Main power window and door lock/unlock switch connector Terminal Ground Continuity
      D12 14 No

    Is the inspection result normal? 

    YES:  Replace main power window and door lock/unlock switch. Refer to REMOVAL AND INSTALLATION . After that, refer to SPECIAL REPAIR REQUIREMENT .

    NO  Repair or replace harness or connectors.

  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 D9 and ground.
      Front power window motor LH connector Terminal Ground Continuity
      D9 4 Yes

    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 D12 and front power window motor LH connector D9.
      Main power window and door lock/unlock switch connector Terminal Front power window motor LH connector Terminal Continuity
      D12 12 D9 4 Yes

    Is the inspection result normal? 

    YES:  Check main power window and door lock/unlock switch. Refer to COMPONENT INSPECTION .

    NO:  Repair or replace the harness or connectors.

  6. CHECK HARNESS CONTINUITY 3

    1. Disconnect main power window and door lock/unlock switch.
    2. Check continuity between main power window D12 and door lock/unlock switch connector and front power window motor LH connector D9.
      Main power window and door lock/unlock switch connector Terminal Front power window motor LH connector Terminal Continuity
      D12 4 D9 6 Yes
      5 5
    3. Check continuity between main power window and door lock/unlock switch connector and ground.
      Main power window and door lock/unlock switch connector Terminal Ground Continuity
      D12 4 No
      5

    Is the inspection result normal? 

    YES:  Replace front power window motor LH. Refer to REMOVAL AND INSTALLATION - FRONT REGULATOR . After that, refer to SPECIAL REPAIR REQUIREMENT .

    NO  Repair or replace harness or connectors.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.