LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2003 >> M45 >> Repair and Diagnosis >> Body & Frame >> Windows >> Power Window System >> Power Window System >> Encoder Switch Check (Driver Side)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Encoder Switch Check (Driver Side)

  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.
      1. 4 (W) - Ground : Approx. 10V 
      Fig 1: Checking Front Power Window Regulator (Driver Side) Power Supply
      G02023371Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK >> GO TO 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.
      1. 4 (W) - 5 (W) : Continuity should exist. 
      4. Fig 2: Checking Harness Continuity
      G02023372Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK >> GO TO 3.

    NG >> Repair or replace harness between driver door control unit (LCU01) and front power window regulator (driver side).

  3. CHECK ENCODER GROUND 

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

    1. 3 (B) - Ground : Continuity should exist. 
      2. Fig 3: Checking Encoder Ground
      G02023373Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK >> GO TO 4.

    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: Checking Encoder Signal
      G02023375Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 5: Identifying Terminal Connector Condition Signal Chart
      G02023374Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK >> Encoder switch circuit is OK.

    NG >> GO TO 5

  5. CHECK ENCODER CIRCUIT 
    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 1 and front power window regulator (driver side) connector D7 terminal 6.
      1. 1 (G) - 6 (G) : Continuity should exist. 
      Fig 6: Checking Encoder Circuit
      G02023376Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check continuity between driver door control unit (LCU01) connector D8 terminal 1 and ground.
      1. 1 (G) - Ground : Continuity should not exist. 

    OK or NG 

    OK >> Replace front power window regulator (driver side)

    NG >> Repair or replace harness between driver door control unit (LCU01) and front power window regulator (driver side).

scientia non olet · About LEMON Manuals