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Home >> Infiniti >> 2010 >> M45 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 SWITICH 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.
    INDICATION 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 SWITICH 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.
    INDICATION 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 "CONSULT-III FUNCTION (METER/M&A) ".

    OK or NG 

    OK: GO TO 4.

    NG: Follow the instructions of "CONSULT-III FUNCTION (METER/M&A) ".

  4. CHECK SNOW MODE SWITCH POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect snow mode switch harness connector.
      Fig 1: Identifying Snow Mode Switch
      G06303532Courtesy of NISSAN MOTOR CO., U.S.A.
    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.

  5. DETECT MALFUNCTIONING PART
    Fig 2: Checking Voltage Between Snow Mode Switch Terminal 1 And Ground
    G05216985Courtesy of NISSAN MOTOR CO., U.S.A.

    Check the following.

    • Harness connectors E108, M15
    • IPDM E/R harness connector E7
    • 10 A 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 SYSTEM WIRING DIAGRAMS article.

      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 ground screws on the body.

    Refer to "GROUND INSPECTION ".

    Fig 3: Identifying Body Ground (M70 And M16)
    G06303534Courtesy 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 SYSTEM WIRING DIAGRAMS article.

      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 "DIAGNOSIS PROCEDURE ".

    INSPECTION END 

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