2003 Nissan-Datsun Sentra SE-R, AutomaticFACTORY OEM SERVICE PROCEDURE

Vehicle Speed Signal Check

WARNING: This page is about a different car, the 2004 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK HARNESS 
    1. Turn ignition switch OFF.
    2. Disconnect display unit connector and unified meter and A/C amp. connector.
    3. Check continuity between display unit harness connector M93 terminal 7 (BR) and unified meter and A/C amp. harness connector M50 terminal 26 (G).

      Continuity should exist. 

    4. Check continuity between display unit harness connector M93 terminal 7 (BR) and ground.

    Continuity should not exist. 

    OK or NG

    1. OK: GO TO 2.
    2. NG: Repair harness.
      Fig 1: Checking Continuity Between Display Unit Harness Connector M93 Terminal 7 (BR) And Unified Meter And A/C Amp. Harness Connector M50 Terminal 26 (G) And Ground
      G03496263Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK 1: VEHICLE SPEED SIGNAL 
    1. Connect display unit connector and unified meter and A/C amp. connector.
    2. Turn ignition switch ON.
    3. Check voltage between display unit harness connector M93 terminal 7 (BR) and ground.

    Approx. 3.5V or more. 

    OK or NG

    1. OK: GO TO 3.
    2. NG " Replace display unit. Refer to CENTER STACK ASSEMBLY .
      Fig 2: Checking Voltage Between Display Unit Harness Connector M93 Terminal 7 (BR) And Ground
      G03496264Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK 2: VEHICLE SPEED SIGNAL 
    1. Drive vehicle at a constant speed.
    2. Check the signal between display unit harness connector M93 terminal 7 (BR) and ground with CONSULT-II or oscilloscope.
    1. 7 (BR) - Ground: Refer to "TERMINALS AND REFERENCE VALUE FOR DISPLAY UNIT  ".

    OK or NG

    1. OK: Replace display unit. Refer to CENTER STACK ASSEMBLY .
    2. NG: Check unified meter and A/C amp. system. Refer to VEHICLE SPEED SIGNAL INSPECTION .
      Fig 3: Checking Signal Between Display Unit Harness Connector M93 Terminal 7 (BR) And Ground With CONSULT-II Or Oscilloscope
      G03496265Courtesy 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.