2004 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

Vehicle Speed Signal Check

WARNING: This page is about a different car, the 2003 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.
  1. HARNESS CHECK 
    1. Turn ignition switch OFF.
    2. Disconnect AV and NAVI control unit connector and combination meter connector.
    3. Check continuity between AV and NAVI control unit harness connector B29 terminal 28 (OR/L) and combination meter harness connector M41 terminal 37 (OR/L).
      1. Continuity should exist. 
      Fig 1: Checking Continuity Between AV & NAVI Control Unit & Combination Meter
      G02024305Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check continuity between AV and NAVI control unit harness connector B29 terminal 28 (OR/L) and ground.
      1. Continuity should not exist. 

    OK or NG 

    OK >> GO TO 2.

    NG >> Repair harness.

  2. VEHICLE SPEED SIGNAL CHECK 1 
    1. Connect AV and NAVI control unit connector and combination meter connector.
    2. Turn ignition switch ON.
    3. Check voltage between AV and NAVI control unit harness connector B29 terminal 28 (OR/L) and ground.
      1. Approx. 3.5V or more 

    OK or NG 

    OK >> GO TO 3.

    NG >> Replace AV and NAVI control unit

    Fig 2: Checking Voltage Between B29 Terminal 28 (Or/L) & Ground
    G02024306Courtesy of NISSAN MOTOR CO., U.S.A.
  3. VEHICLE SPEED SIGNAL CHECK 2 
    1. Drive vehicle at a constant speed.
    2. Check the signal between AV and NAVI control unit harness connector B29 terminal 28 (OR/L) and ground with CONSULT-II or oscilloscope.
      1. 28 (OR/L) - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR AV AND NAVI CONTROL UNIT   "  .

    OK or NG 

    OK >> Replace AV and NAVI control unit.

    NG >> Check combination meter system, refer to "INSPECTION/VEHICLE SPEED SIGNAL ".

    Fig 3: Checking Signal Between B29 Terminal 28 (Or/L) & Ground
    G02024307Courtesy 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.

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