2012 Infiniti G25 BaseFACTORY OEM SERVICE PROCEDURE

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 ".

    Which circuit is related to the incident? 

    Snow mode switch: GO TO 2.

    Snow mode indicator: GO TO  7.

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

    Refer to "CONSULT 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.
      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
    • 10 A 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.
      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  7.

      NO: GO TO 6.

  6. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness for open or short between snow mode switch and "unified meter and A/C amp."

      Repair open circuit or short to ground or short to power.

  7. 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 8.

      NO: Repair or replace ground connection.

  8. CHECK SNOW MODE INDICATOR LAMP GROUND CIRCUIT FOR OPEN AND SHORT
    1. Check the continuity between snow mode switch harness connector and ground.
      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  10.

      NO: GO TO 9.

  9. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness for open or short between snow mode switch and ground

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

  10. CHECK SNOW MODE SWITCH

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 11.

    NO: Replace snow mode switch. Refer to "A/T MODELS: EXPLODED VIEW ".

  11. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

INSPECTION END

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.