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Home >> Infiniti >> 2005 >> QX56 AWD >> Repair and Diagnosis >> Transmission >> Automatic Transmission >> Tow Mode Switch >> Diagnostic Procedure

Diagnostic Procedure

  1. CHECK CAN COMMUNICATION LINE 

    Perform the self-diagnosis. Refer to "SELF-DIAGNOSTIC RESULT MODE ".

    Is a malfunction in the CAN communication indicated in the results? 

    1. YES: Check CAN communication line. Refer to "DTC U1000 CAN COMMUNICATION LINE ".
    2. NO: GO TO 2.
  2. CHECK POWER SOURCE 
    1. Turn ignition switch "ON". (Do not start engine.)
    2. Check the voltage between tow mode switch connector terminal 1 and ground.
    Fig 1: TOW Mode Switch Connector Terminal 1 & Ground Voltage Chart
    G02382503Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 2: Checking Voltage Between TOW Mode Switch Connector Terminal 1 & Ground
    G02382504Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: GO TO 3.
  3. CHECK TOW MODE SWITCH 
    1. Turn ignition switch "OFF".
    2. Disconnect tow mode switch connector.
    3. Check continuity between tow mode switch connector M67 terminals 1 and 2.
    Fig 3: Checking Continuity Between TOW Mode Switch Connector M67 Terminals 1 & 2
    G02382505Courtesy of NISSAN MOTOR CO., U.S.A.
    TOW MODE SWITCH CONTINUITY TABLE

    Condition Continuity
    Tow mode switch "ON" Yes
    Tow mode switch "OFF" No

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Repair or replace tow mode switch.
  4. DETECT MALFUNCTIONING ITEM 

    Check the following items. If any items are damaged, repair or replace damaged parts.

    • Harness for short or open between combination meter connector terminal 35 and tow mode switch connector terminal 1.
    • Harness for short or open between tow mode switch connector terminal 2 and ground.

    OK or NG 

    1. OK: GO TO 5.
    2. NG: Repair or replace damaged parts.
  5. CHECK COMBINATION METER 

    Check the combination meter. Refer to "HOW TO PROCEED WITH TROUBLE DIAGNOSIS ".

    OK or NG 

    1. OK: INSPECTION END 
    2. NO: Repair or replace damaged parts.