2011 Infiniti EX35 Base, RWDFACTORY OEM SERVICE PROCEDURE

Diagnosis Procedure

  1. CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT-I
    1. Turn ignition switch OFF.
    2. Disconnect ICC brake switch harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between ICC brake switch harness connector and ground.
    VOLTAGE SPECIFICATION

    ICC brake switch Ground Voltage
    Connector Terminal
    E111 1 Ground Battery voltage

    Is the inspection result normal? 

    YES: GO TO  8.

    NO: GO TO 2.

  2. CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT-II
    1. Turn ignition switch OFF.
    2. Disconnect ICC brake hold relay.
    3. Turn ignition switch ON.
    4. Check the voltage between ICC brake hold relay harness connector and ground.
    VOLTAGE SPECIFICATION

    ICC brake hold relay Ground Voltage
    Connector Terminal
    E50 3 Ground Battery voltage

    Is the inspection result normal? 

    YES: GO TO  4.

    NO: GO TO 3.

  3. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E103
    • 10 A fuse (No. 3)
    • Harness for open or short between ICC brake hold relay and fuse

    Repair open circuit or short to ground in harness or connectors.

  4. CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT-III
    1. Turn ignition switch OFF.
    2. Check the continuity between ICC brake switch harness connector and ICC brake hold relay harness connector.
      CONTINUITY SPECIFICATION

      ICC brake switch ICC brake hold relay Continuity
      Connector Terminal Connector Terminal
      E111 1 E50 4 Existed
    3. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO 5.

    NO: Repair open circuit, short to ground or short to power in harness or connectors.

  5. CHECK ICC BRAKE HOLD RELAY CONTROL CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect brake booster control unit harness connector.
    3. Check the continuity between ICC brake hold relay harness connector and brake booster control unit harness connector.
      CONTINUITY SPECIFICATION

      ICC brake hold relay Brake booster control unit Continuity
      Connector Terminal Connector Terminal
      E50 1 B249 47 Existed
    4. Check the continuity between ICC brake hold relay harness connector and ground.
      CONTINUITY SPECIFICATION

      ICC brake hold relay Ground Continuity
      Connector Terminal
      E50 2 Ground Existed
    5. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO  7.

    NO: GO TO 6.

  6. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E106, M6
    • Harness connectors M117, B201
    • Harness for open or short between ICC brake hold relay and brake booster control unit
    • Harness for open or short between ICC brake hold relay and ground

    Repair open circuit, short to ground or short to power in harness or connectors.

  7. CHECK ICC BRAKE HOLD RELAY

    Refer to "COMPONENT INSPECTION (ICC BRAKE HOLD RELAY) ".

    Is the inspection result normal? 

    YES: GO TO  11.

    NO: Replace ICC brake hold relay.

  8. CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between ICC brake switch harness connector and ECM harness connector.
      CONTINUITY SPECIFICATION

      ICC brake switch ECM Continuity
      Connector Terminal Connector Terminal
      E111 2 M107 126 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO  10.

    NO: GO TO 9.

  9. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E106, M6
    • Harness for open or short between ICC brake switch and ECM

    Repair open circuit, short to ground or short to power in harness or connectors.

  10. CHECK ICC BRAKE SWITCH

    Refer to "COMPONENT INSPECTION (ICC BRAKE SWITCH) ".

    Is the inspection result normal? 

    YES: GO TO 11.

    NO: Replace ICC brake switch.

  11. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    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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