2004 Infiniti FX45FACTORY OEM SERVICE PROCEDURE

Encoder Circuit Check (Driver Side)

  1. Check Front Power Window Motor (Driver Side) Power Supply 
    1. Turn ignition switch ON.
    2. Check voltage between front power window motor (driver side) connector D8 terminal 4 and ground.
      Fig 1: Checking Voltage At Driver's Side Front Power Window Motor Connector D8 Terminal 4
      G02494094Courtesy of NISSAN MOTOR CO., U.S.A.

      4 (W) - Ground: Approx. 10 V 

    OK or NG

    1. OK: Go to  3 .
    2. NG: Go to 2.

  2. Check Harness Continuity 1 
    1. Turn ignition switch OFF.
    2. Disconnect power window main switch and front power window motor (driver side).
    3. Check continuity between power window main switch connector D6 terminal 15 and front power window motor (driver side) connector D8 terminal 4.
      Fig 2: Checking Continuity Power Window Main Switch Connector D6 Terminal 15 To Front Power Window Motor Connector D8 Terminal 4
      G02494095Courtesy of NISSAN MOTOR CO., U.S.A.

      15 (W) - 4 (W): Continuity should exist  .

    OK or NG

    1. OK: Replace power window main switch.
    2. NG: Repair or replace harness between power window main switch and front power window motor (driver side).

  3. Check Ground Circuit 
    1. Turn ignition switch OFF.
    2. Disconnect front power window motor (driver side) connector.
    3. Check continuity between front power window motor (driver side) connector D8 terminal 6 and ground.
      Fig 3: Checking Continuity Driver's Side Front Power Window Motor Connector D8 Terminal 6 To Body Ground
      G02494096Courtesy of NISSAN MOTOR CO., U.S.A.

      4 (SB) - Ground: Continuity should exist  .

    OK or NG

    1. OK: Go to  5 .
    2. NG: Go to 4.

  4. Check Harness Continuity 2 
    1. Disconnect power window main switch connector.
    2. Check continuity between power window main switch connector D6 terminal 2 and front power window motor (driver side) connector D8 terminal 6.
      Fig 4: Continuity Test Power Window Main Switch Connector D6 Terminal 2 To Front Power Window Motor Connector D8 Terminal 6
      G02494097Courtesy of NISSAN MOTOR CO., U.S.A.

      2 (SB) - 6 (SB): Continuity should exist  .

    OK or NG

    1. OK: Replace power window main switch.
    2. NG: Repair or replace harness between power window main switch and front power window motor (driver side).

  5. Check Encoder Signal 
    1. Connect front power window motor (driver side) connector.
    2. Turn ignition switch ON.
    3. Check signal between power window main switch connector and ground with oscilloscope.
      Fig 5: Identifying Power Window Main Switch Signal
      G02494098Courtesy of NISSAN MOTOR CO., U.S.A.
Factory Service Tools

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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.

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