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Home >> Infiniti >> 2008 >> M35 Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (VQ35DE) - Component And System Testing >> Snow Mode Switch >> Diagnostic Procedure
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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 CONDITION CHART

      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 mode indicator in the snow mode switch under the following condition.
      SNOW MODE SWITCH CONDITION CHART

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

    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 "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.

    • Harness connectors E108, M15
    • IPDM E/R harness connector E7
    • 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 23. 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 two ground screws on the body.

      Refer to "GROUND INSPECTION ".

      Fig 2: Identifying Body Ground M70 And M16
      G05210258Courtesy 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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