2008 Infiniti FX45FACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

  1. CHECK SNOW MODE SWITCH OVERALL FUNCTION-I 
    1. Turn ignition switch ON.
    2. Select "SNOW MODE SW" in "DATA MONITOR" mode with CONSULT-III.
    3. Check "SNOW MODE SW" indication under the following conditions.
    SNOW MODE SWITCH INDICATION CONDITIONS

    CONDITION INDICATION
    Snow mode switch: ON ON
    Snow mode switch: OFF OFF

    OK or NG 

    OK: GO TO  2.

    NG: GO TO  3.

  2. CHECK SNOW MODE SWITCH OVERALL FUNCTION-II 
    1. Turn ignition switch ON.
    2. Start engine.
    3. Check the snow indicator lamp under the following condition.
    SNOW INDICATOR LAMP INDICATION CONDITION

    CONDITION INDICATOR LAMP
    Snow mode switch: ON Illuminated
    Snow mode switch: OFF Not illuminated

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO  7.

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

    Refer to "SELF-DIAG RESULTS ".

    OK or NG 

    OK: GO TO  4.

    NG: Go to DI-28, "UNIFIED METER AND A/C AMP"  .

  4. 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 voltage between snow mode switch terminal 1 and ground with CONSULT-III or tester.

      Voltage: Battery voltage. 

    OK or NG 

    OK: GO TO  6.

    NG: GO TO  5.

    Fig 1: Checking Voltage Between Snow Mode Switch Terminal 1 And Ground
    G05216985Courtesy of NISSAN MOTOR CO., U.S.A.
  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • 10A fuse
    • 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.

  6. 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 harness continuity between snow mode switch terminal 4 and "unified meter and A/C amp." terminal 12. Refer to WIRING DIAGRAM .

      Continuity should exist. 

    4. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  9.

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

  7. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten three ground screws on the body.

      Refer to "GROUND INSPECTION ".

    Fig 2: Identifying Ground Connections
    G05217147Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  8.

    NG: Repair or replace ground connections.

  8. CHECK SNOW MODE INDICATOR LAMP GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Check harness continuity between snow mode switch terminal 2 and ground.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

    2. Also check harness for short to power.

    OK or NG 

    OK: GO TO  9.

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

  9. CHECK SNOW MODE SWITCH 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO  10.

    NG: Replace snow mode switch.

  10. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    >> INSPECTION END 

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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.