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Home >> Infiniti >> 2008 >> G35 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing >> Snow Mode Switch >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK SNOW MODE SWITCH OVERALL FUNCTION-I

    Confirm the malfunctioning circuit (snow mode switch or snow mode indicator). Refer to "COMPONENT FUNCTION CHECK ".

    Snow mode switch or snow mode indicator 

    Snow mode switch >> GO TO 2.

    Snow mode indicator >> GO TO  6.

  2. CHECK DTC WITH "UNIFIED METER AND A/C AMP."

    Refer to "CONSULT-III FUNCTION (METER/M&A) ".

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: Go to "WORK FLOW ".

  3. 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.
      TERMINALS VOLTAGE REFERENCE

      Snow mode switch Ground Voltage
      Connector Terminal
      M139 1 Ground Battery voltage

    Is the inspection result normal? 

    YES: GO TO  5.

    NO: GO TO 4.

  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E106, M6
    • IPDM E/R harness connector E7
    • 10A fuse (No. 43)
    • Harness for open or short between snow mode switch and fuse.

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

  5. CHECK SNOW MODE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect "unified meter and A/C amp." harness connector.
    3. Check the continuity between snow mode switch harness connector and "unified meter and A/C amp." harness connector.
      TERMINALS CONTINUITY REFERENCE

      Snow mode switch Unified meter and A/C amp. Continuity
      Connector Terminal Connector Terminal
      M139 4 M66 23 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO  8.

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

  6. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connection M95. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 7.

    NO: Repair or replace ground connection.

  7. CHECK SNOW MODE INDICATOR LAMP GROUND CIRCUIT FOR OPEN AND SHORT
    1. Check the continuity between snow mode switch harness connector and ground.
      TERMINALS CONTINUITY REFERENCE

      Snow mode switch Ground Continuity
      Connector Terminal
      M139 2 Ground Existed
    2. Also check harness for short to power.

    Is the inspection result normal? 

    YES: GO TO 8.

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

  8. CHECK SNOW MODE SWITCH

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 9.

    NO: Replace snow mode switch.

  9. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

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