2003 Infiniti Q45FACTORY OEM SERVICE PROCEDURE

Rear Door Control Unit Circuit Check

  1. POWER SUPPLY CIRCUIT CHECK 
    1. Turn ignition switch OFF.
    2. Disconnect rear door control unit LH or RH connector.
    3. Check voltage between rear door control unit LH or RH connector D59(LH) or D79(RH) terminal 6 and ground.
      1. 6 (W/R) - Ground : Battery voltage 
      Fig 1: Checking Voltage Between Rear Door Control Unit LH Or RH Connector D59 (LH) Or D79 (RH) Terminal 6 And Ground
      G02045118Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK >> GO TO 2.
    2. NG >> Check the following.
      • 40A fusible link (letter H. located in fuse and fusible link box).
      • Harness for open or short between rear door control unit LH or RH and fuse.
  2. GROUND CIRCUIT CHECK 

    Check continuity between passenger door control unit LH or RH connector D59(LH) or D79(RH) terminal 7 and ground.

    1. 7 (B) - Ground : Continuity should exist. 
    Fig 2: Checking Continuity Between Passenger Door Control Unit LH Or RH Connector D59 (LH) Or D79 (RH) Terminal 7 And Ground
    G02045119Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK >> GO TO 3.
    2. NG >> Repair or replace harness.
  3. COMMUNICATION CIRCUIT CHECK 
    1. Disconnect driver door control unit connector.
    2. Check continuity between driver door control unit connector D8 terminal 5 and rear door control unit LH or RH connector D58 (LH), D78 (RH) terminal 11.
      1. 5 (G/OR) - 11 (G/OR) : Continuity should exist. 
      Fig 3: Checking Continuity Between Driver Door Control Unit Connector D8 Terminal 5 And Rear Door Control Unit LH Or RH Connector D58 (LH), D78 (RH) Terminal 11
      G02045120Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK >> INSPECTION END.
    2. NG >> Repair or replace harness between door control unit and rear door control unit LH or RH.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.