2004 Infiniti FX45FACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

  1. Check Stop Lamp Switch Circuit 
    1. Turn ignition switch OFF.
    2. Check the stop lamp when depressing and releasing the brake pedal.
      Fig 1: Identifying Stop Lamp Switch Specifications
      G00345431Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: go to  4 .
    2. NG: go to 2.

  2. Check Stop Lamp Switch Power Supply Circuit 
    1. Disconnect stop lamp switch harness connector. See Figure .
    2. Check voltage between stop lamp switch terminal 1 and ground with CONSULT-II or tester. See Figure .
      1. Voltage: Battery voltage 

    OK or NG

    1. OK: go to  4 .
    2. NG: go to 3.

  3. Detect Malfunctioning Part 

    Check the following.

    • 10A fuse
    • Fuse block (J/B) connector E201
    • Harness for open and short between stop lamp switch and battery
      1. Repair open circuit or short to ground or short to power in harness or connectors.

  4. Check Stop Lamp Switch Input Signal Circuit For Open And Short 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Disconnect stop lamp switch harness connector. See Figure .
    4. Check harness continuity between ECM terminal 101 and stop lamp switch terminal 2.

      Refer to wiring diagram. See Figure .

      1. Continuity should exist  .
    5. Also check harness for short to ground and short to power.

    OK or NG

    1. OK: go to  6 .
    2. NG: go to 5.

  5. Detect Malfunctioning Part 

    Check the following.

    • Harness connectors E211, M41
    • Harness for open or short between ECM and stop lamp switch
      1. Repair open circuit or short to ground or short to power in harness or connectors.

  6. Check Stop Lamp Switch 

    Refer to COMPONENT INSPECTION  .

    OK or NG

    1. OK: go to 7.
    2. NG: Replace stop lamp switch.

  7. Check Intermittent Incident 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

    1. Inspection end 
Factory Service Tools

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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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