LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2012 >> FX35 RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing >> ICC Brake Switch >> Diagnosis Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnosis Procedure

  1. CHECK DTC WITH ICC SENSOR INTEGRATED UNIT

    Refer to "DIAGNOSIS DESCRIPTION ".

    Are any DTCs detected? 

    YES: Perform the Diagnosis Procedure corresponding to the detected DTC.

    NO: GO TO 2.

  2. CHECK OVERALL FUNCTION

    With CONSULT 

    1. Turn ignition switch ON.
    2. Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT.
    3. Check "BRAKE SW1" indication as per the following conditions:
      Monitor item Condition Indication
      BRAKE SW1 (ICC brake switch) Brake pedal Slightly depressed OFF
      Fully released ON

    Without CONSULT 

    1. Turn ignition switch ON.
    2. Check the voltage between ECM harness connector terminals as per the following conditions:
      ECM Condition Voltage (V)
      Connector + -
      Terminal Terminal
      M107 117 (ICC brake switch signal) 128 Brake pedal Slightly depressed Approx. 0
      Fully released Battery voltage

      Is the inspection result normal? 

      YES: INSPECTION END

      NO: GO TO 3.

  3. 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.
      ICC brake switch Ground Voltage
      Connector Terminal
      E114 1 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  10.

      NO: GO TO 4.

  4. 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.
      ICC brake hold relay Ground Voltage
      Connector Terminal
      E91 3 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  6.

      NO: GO TO 5.

  5. 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.

  6. 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.
      ICC brake switch ICC brake hold relay Continuity
      Connector Terminal Connector Terminal
      E114 1 E91 4 Existed
    3. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 7.

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

  7. 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.
      ICC brake hold relay Brake booster control unit Continuity
      Connector Terminal Connector Terminal
      E91 1 B249 47 Existed
    4. Check the continuity between ICC brake hold relay harness connector and ground.
      ICC brake hold relay Ground Continuity
      Connector Terminal
      E91 2 Ground Existed
    5. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  9.

      NO: GO TO 8.

  8. 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.

  9. CHECK ICC BRAKE HOLD RELAY

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

    Is the inspection result normal? 

    YES: GO TO  13.

    NO: Replace ICC brake hold relay.

  10. 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.
      ICC brake switch ECM Continuity
      Connector Terminal Connector Terminal
      E114 2 M107 126 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  12.

      NO: GO TO 11.

  11. 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.

  12. CHECK ICC BRAKE SWITCH

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

    Is the inspection result normal? 

    YES: GO TO 13.

    NO: Replace ICC brake switch. Refer to "REMOVAL AND INSTALLATION ".

  13. CHECK INTERMITTENT INCIDENT

    Perform "INTERMITTENT INCIDENT ".

    : INSPECTION END

scientia non olet · About LEMON Manuals