2003 Infiniti M45FACTORY OEM SERVICE PROCEDURE

Driver Door Control Unit Circuit Check

  1. CHECK POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect driver door control unit (LCU01) connector.
    3. Check voltage between driver door control unit (LCU01) connector D8 terminal 14 and ground.
      1. 14 (Y/G) - Ground : Battery voltage 
      4. Fig 1: Checking Power Supply Circuit
      G02023383Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK >> GO TO 2.

    NG >> Check the following.

    • 40A fusible link (letter H. located in fuse and fusible link box).
    • Harness for open or short between driver control unit (LCU01) and fuse.
  2. CHECK GROUND CIRCUIT 

    Check continuity between driver door control unit (LCU01) connector D8 terminal 15 and ground.

    1. 15 (B) - Ground : Continuity should exist. 
      2. Fig 2: Checking Ground Circuit
      G02023384Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK >> INSPECTION END

    NG >> Repair or replace harness.

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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.