2013 Infiniti FX37 Limited EditionFACTORY OEM SERVICE PROCEDURE

Diagnosis Procedure

  1. CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ASCD brake switch harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between ASCD brake switch harness connector and ground.
      ASCD brake switch Ground Voltage
      Connector Terminal
      E109 1 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  3.

      NO: GO TO 2.

  2. DETECT MALFUNCTIONING PART 

    Check the following.

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

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

  3. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between ASCD brake switch harness connector and ECM harness connector.
      ASCD brake switch ECM Continuity
      Connector Terminal Connector Terminal
      E109 2 M164 126 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  5.

      NO: GO TO 4.

  4. DETECT MALFUNCTIONING PART 

    Check the following.

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

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

  5. CHECK ASCD BRAKE SWITCH 

    Refer to "COMPONENT INSPECTION (ASCD BRAKE SWITCH) "

    Is the inspection result normal? 

    YES: GO TO 6.

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

  6. CHECK INTERMITTENT INCIDENT 

    Refer to "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.