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Home >> Infiniti >> 2012 >> QX56 RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing (For MEXICO) >> Snow Mode Switch >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK DTC WITH COMBINATION METER

    Refer to "CONSULT FUNCTION ".

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: Go to "WORK FLOW ".

  2. CHECK SNOW MODE SWITCH POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect snow mode switch harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between snow mode switch harness connector and ground.
      Snow mode switch Ground Voltage
      Connector Terminal
      M54 12 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 harness connector M3
    • 10 A fuse (No. 13)
    • Harness for open or short between snow mode switch and fuse.

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

  4. CHECK SNOW MODE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect combination meter harness connector.
    3. Check the continuity between snow mode switch harness connector and combination meter harness connector.
      Snow mode switch Combination meter Continuity
      Connector Terminal Connector Terminal
      M54 22 M34 33 Existed
    4. 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 connector.

  5. CHECK SNOW MODE SWITCH

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 6.

    NO: Replace snow mode switch. Refer to "REMOVAL AND INSTALLATION ".

  6. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END