2008 Infiniti FX35 AWDFACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

  1. CHECK OVERALL FUNCTION 

    With CONSULT-III 

    1. Turn ignition switch ON.
    2. Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT-III.
    3. Check "BRAKE SW1" indication under the following conditions.
    BRAKE SWITCH INDICATION AND BRAKE PEDAL CONDITION

    CONDITION INDICATION
    Brake pedal: Slightly depressed OFF
    Brake pedal: Fully released ON

    Without CONSULT-III 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 108 and ground under the following conditions.
    BRAKE PEDAL POSITION AND VOLTAGE REFERENCE

    CONDITION VOLTAGE
    Brake pedal: Slightly depressed Approximately 0V
    Brake pedal: Fully released Battery voltage

    OK or NG 

    OK: GO TO INSPECTION END  .

    NG: GO TO  2.

    Fig 1: Checking Voltage Between ECM Terminal 108 And Ground
    G04900670Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK DTC WITH ICC UNIT 

    Refer to "TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS ".

    OK or NG 

    OK: GO TO  3.

    NG: Repair or replace.

  3. CHECK ICC BRAKE SWITCH CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ICC brake hold relay.
    3. Turn ignition switch ON.
      Fig 2: Identifying Battery And ICC Brake Hold Relay
      G05216801Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between ICC brake hold relay terminal 3 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  8.

    NG: GO TO  4.

    Fig 3: Checking Voltage Between ICC Brake Hold Relay Terminal 3 And Ground
    G05216802Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ICC brake switch harness connector.
    3. Turn ignition switch ON.
      Fig 4: Identifying ICC Brake Switch And Stop Lamp Switch
      G05216794Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between ICC brake switch terminal 1 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  6.

    NG: GO TO  5.

    Fig 5: Checking Voltage Between ICC Brake Switch Terminal 1 And Ground
    G04875403Courtesy of NISSAN MOTOR CO., U.S.A.
  5. DETECT MALFUNCTIONING PART 

    Check the following.

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

      >> 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 .

      Continuity should exist. 

    3. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  7.

    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 

    OK: GO TO  11.

    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.

      Continuity should exist. 

    4. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  10.

    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

      >> 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 ".

    OK: GO TO  11.

    NG: Replace ICC brake fold relay.

  11. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    >> 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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