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Home >> Infiniti >> 2011 >> M37 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 86 (Automatic Transaxle) >> DTC/Circuit Diagnosis >> Tow Mode System >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Tow mode switch is integrated in to SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly (4WD models).
  1. CHECK DTC OF TCM

    With CONSULT 

    1. Turn ignition switch ON.
    2. Perform "Self-Diagnostic Results" in "TRANSMISSION".

      Is any DTC detected? 

      YES: Check DTC detected item. Refer to "DTC INDEX ".

      NO: GO TO 2.

  2. CHECK DTC OF COMBINATION METER

    With CONSULT 

    Perform "Self-Diagnostic Results" in "METER/M&A".

    Is any DTC detected? 

    YES: Check DTC detected item. Refer to "DTC INDEX ".

    NO: GO TO 3.

  3. CHECK COMBINATION METER

    With CONSULT 

    1. Select "TOW MODE IND" in "Data Monitor" in "METER/M&A".
    2. Check that "TOW MODE IND" turns ON/OFF when tow mode switch is operated.

      Is the inspection result normal? 

      YES: Replace combination meter. Refer to "EXPLODED VIEW ".

      NO: GO TO 4.

  4. CHECK TOW MODE SWITCH SIGNAL

    With CONSULT 

    1. Select "TOW MODE SW" in "Data Monitor" in "TRANSMISSION".
    2. Check that "TOW MODE SW" turns ON/OFF when tow mode switch is operated.

      Is the inspection result normal? 

      YES: Replace combination meter. Refer to "EXPLODED VIEW ".

      NO: GO TO 5.

  5. CHECK TOW MODE SWITCH CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly connector (4WD models).
    3. Turn ignition switch ON.
    4. Check voltage between SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly connector (4WD models) vehicle side harness connector terminals.
      SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly (4WD models) Voltage (Approx.)
      Connector Terminal
      + -
      M54(1)
      M147(2)      		 23 20 Battery voltage
      (1) 4WD models
      (2) 2WD models

      Is the inspection result normal? 

      YES: GO TO 6.

      NO: GO TO  9.

  6. CHECK TOW MODE SWITCH

    Check tow mode switch. Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 7.

    NO: Repair or replace damaged parts.

  7. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: GO TO 8.

    NO: Repair or replace damaged parts.

  8. CHECK TOW MODE SYSTEM
    1. Replace the control valve & TCM. Refer to "EXPLODED VIEW ".
    2. Reinstall any parts removed.
    3. Check tow mode system. Refer to "COMPONENT FUNCTION CHECK ".

      Is the inspection result normal? 

      YES: INSPECTION END

      NO: Replace combination meter. Refer to "EXPLODED VIEW ".

  9. CHECK GROUND CIRCUIT
    1. Turn ignition switch OFF.
    2. Check continuity between SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly connector (4WD models) vehicle side harness connector terminal and ground.
      SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly (4WD models) Ground Continuity
      Connector Terminal
      M54(1)
      M147(2)      		 20 Existed
      (1) 4WD models
      (2) 2WD models

      Is the inspection result normal? 

      YES: GO TO 10.

      NO: Repair or replace damaged parts.

  10. CHECK HARNESS BETWEEN SNOW MODE/TOW MODE/VDC OFF SWITCH ASSEMBLY (2WD MODELS) OR 4WD SWITCH ASSEMBLY (4WD MODELS) AND COMBINATION METER (PART 1)
    1. Disconnect combination meter connector.
    2. Check continuity between SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly connector (4WD models) vehicle side harness connector terminal and combination meter vehicle side harness connector terminal.
      SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly (4WD models) Combination meter Continuity
      Connector Terminal Connector Terminal
      M54(1)
      M147(2)      		 23 M34 7 Existed
      (1) 4WD models
      (2) 2WD models

      Is the inspection result normal? 

      YES: GO TO 11.

      NO: Repair or replace damaged parts.

  11. CHECK HARNESS BETWEEN SNOW MODE/TOW MODE/VDC OFF SWITCH ASSEMBLY (2WD MODELS) OR 4WD SWITCH ASSEMBLY (4WD MODELS) AND COMBINATION METER (PART 2)

    Check continuity between SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly connector (4WD models) vehicle side harness connector terminal and ground.

    SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly (4WD models) Ground Continuity
    Connector Terminal
    M54(1)
    M147(2)    		 23 Not existed
    (1) 4WD models
    (2) 2WD models

    Is the inspection result normal? 

    YES: GO TO 12.

    NO: Repair or replace damaged parts.

  12. CHECK COMBINATION METER
    1. Reconnect all the connectors.
    2. Check combination meter input/output signal. Refer to "REFERENCE VALUE ".

      Is the inspection result normal? 

      YES: Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".

      NO: Replace combination meter. Refer to "EXPLODED VIEW ".

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