2004 Infiniti FX45FACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

  1. Check Overall Function-I 

    With CONSULT-II 

    1. Turn ignition switch ON.
    2. Select BRAKE SW1 in DATA MONITOR mode with CONSULT-II. See Figure .
    3. Check BRAKE SW1 indication under the following conditions. See Figure .

    Without CONSULT-II 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 108 and ground under the following conditions. See Figure and Figure .

    OK or NG

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

  2. Check Overall Function-II 

    With CONSULT-II 

    Check BRAKE SW2 indication in DATA MONITOR mode. See Figure and Figure .

    Without CONSULT-II 

    Check voltage between ECM terminal 101 and ground under the following conditions. See Figure and Figure .

    OK or NG

    1. OK : Inspection end 
    2. NG : go to  11 .

  3. Check ICC Brake Switch Circuit 
    1. Turn ignition switch OFF.
    2. Disconnect ICC brake hold relay. See Figure .
    3. Turn ignition switch ON.
    4. Check voltage between ICC brake hold relay terminal 3 and ground with CONSULT-II or tester. See Figure .
      1. Voltage: Battery voltage 

    OK or NG

    1. OK : go to  8 .
    2. NG : go to 4.

  4. Check ICC Brake Switch Power Supply Circuit 
    1. Turn ignition switch OFF.
    2. Disconnect ICC brake switch harness connector. See Figure .
    3. Turn ignition switch ON.
    4. Check voltage between ICC brake switch terminal 1 and ground with CONSULT-II or tester. See Figure .
      1. Voltage: Battery voltage 

    OK or NG

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

  5. Detect Malfunctioning Part 

    Check the following.

    • Fuse block (J/B) connector M201
    • 10A fuse
    • Harness for open or short between ICC brake switch and fuse

    1. Repair open circuit or short to ground or short to power in harness or connectors.
  6. Check ICC Brake Switch Input Signal Circuit For Open And Short-I 
    1. Turn ignition switch OFF.
    2. Check harness continuity between ICC brake hold relay terminal 3 and ICC brake switch terminal 2. Refer to wiring diagram. See Figure .
      1. Continuity should exist  .
    3. Also check harness for short to ground and short to power.

    OK or NG

    1. OK : go to 7.
    2. NG : Repair open circuit or short to ground or short to power in harness or connectors.

  7. Check ICC Brake Switch 

    Refer to COMPONENT INSPECTION  .

    OK or NG

    1. OK : go to  16 .
    2. NG : Replace ICC brake switch.

  8. Check ICC Brake Switch Input Signal Circuit For Open And Short-II 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between ICC brake hold relay terminal 4 and ECM terminal 108. Refer Wiring Diagram.
      1. Continuity should exist  .
    4. Also check harness for short to ground and short to power.

    OK or NG

    1. OK : go to  10 .
    2. NG : go to 9.

  9. Detect Malfunctioning Part 

    Check the following.

    • Harness connectors E211, M41
    • Harness for open or short between ICC brake hold relay and ECM

    1. Repair open circuit or short to ground or short to power in harness or connectors.
  10. Check ICC Brake Hold Relay 

    Refer to COMPONENT INSPECTION  .

    1. OK : go to  16 .
    2. NG : Replace ICC brake fold relay.
  11. Check Stop Lamp Switch Power Supply Circuit 
    1. Turn ignition switch OFF.
    2. Disconnect stop lamp switch harness connector. See Figure .
    3. 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  13 .
    2. NG :go to 12.

  12. Detect Malfunctioning Part 

    Check the following.

    • Fuse block (J/B) connector E201
    • 10A fuse
    • Harness for open or short between stop lamp switch and battery

    1. Repair open circuit or short to ground or short to power in harness or connectors.
  13. Check Stop Lamp Switch Input Signal Circuit For Open And Short 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminal 101 and stop lamp switch terminal 2. Refer to wiring diagram. See Figure .
      1. Continuity should exist  .
    3. Also check harness for short to ground and short to power.

    OK or NG

    1. OK : go to  15 .
    2. NG : go to 14.

  14. 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.
  15. Check Stop Lamp Switch 

    Refer to COMPONENT INSPECTION 

    OK or NG

    1. OK : go to 16.
    2. NG : Replace stop lamp switch.

  16. Check Intermittent Incident 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

    1. Inspection end 
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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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