2002 Nissan-Datsun Sentra SE-R Spec VFACTORY OEM SERVICE PROCEDURE

Encoder Switch Check (Driver Side)

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check Front Power Window Regulator (Driver Side) Power Supply 
    1. Turn ignition switch ON.
    2. Check voltage between driver door control unit (LCU01) connector D8 terminal 4 and ground.
      Fig 1: Checking Front Power Window Regulator (Driver Side) Power Supply
      G02340145Courtesy of NISSAN MOTOR CO., U.S.A.
      1. 4 (W) - Ground: Approx. 10V 

    OK or NG 

    1. OK: Go to 2.
    2. NG: Replace driver door control unit (LCU01).

  2. Check Harness Continuity 
    1. Turn ignition switch OFF.
    2. Disconnect driver door control unit (LCU01) and front power window regulator (driver side) connector.
    3. Check continuity between driver door control unit (LCU01) connector D8 terminal 4 and front power window regulator (driver side) connector D7 terminal 5.
      Fig 2: Checking Circuit Continuity
      G02340146Courtesy of NISSAN MOTOR CO., U.S.A.
      1. 4 (W) - 5 (W): Continuity should exist. 

    OK or NG 

    1. OK: Go to 3.
    2. NG: Repair or replace harness between driver door control unit (LCU01) and front power window regulator (driver side).

  3. Check Encoder Ground 
    Fig 3: Checking Encoder Ground
    G02340147Courtesy of NISSAN MOTOR CO., U.S.A.

    Check continuity between front power window regulator (driver side) connector D7 terminal 3 and ground.

    1. 3 (B) - Ground: Continuity should exist. 

    OK or NG 

    1. OK: Go to 4.
    2. NG: Repair or replace harness.

  4. Check Encoder Signal 
    1. Connect driver door control unit (LCU01) and front power window regulator (driver side) connector.
    2. Turn ignition switch ON.
    3. Check the signal between driver door control unit (LCU01) connector and ground with oscilloscope.
      Fig 4: Terminals Connector Condition Signal Chart
      G02340148Courtesy of NISSAN MOTOR CO., U.S.A.
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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.