2003 Infiniti FX35 AWDFACTORY OEM SERVICE PROCEDURE

Check Key Switch

  1. CHECK KEY SWITCH INPUT SIGNAL 

    With CONSULT-II 

    Check ignition key switch "KEY ON SW" in "DATA MONITOR" mode with CONSULT-II.

    • When key is inserted in ignition key cylinder

      KEY ON SW : ON 

    • When key is removed from ignition key cylinder

      KEY ON SW : OFF 

      Fig 1: Checking Key Switch Input Signal With CONSULT-II
      G03106987Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    Check voltage between BCM connector M3 terminal 37 (B/W) and ground.

    KEY SWITCH CONDITION AND VOLTAGE SPECIFICATIONS

    Condition of key switch Voltage (V) Approx.
    Key is inserted in ignition key cylinder. Battery voltage
    Key is removed from ignition key cylinder. 0
    Fig 2: Checking Key Switch Input Signal Without CONSULT-II
    G03106988Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK : Key switch circuit is OK.
    2. NG : GO TO 2.
  2. CHECK KEY SWITCH (WITHOUT INTELLIGENT KEY) 
    1. Disconnect key switch connector.
    2. Check continuity between key switch terminals 1 and 2.
      KEY SWITCH CONDITION AND CONTINUITY SPECIFICATIONS

      Key switch condition Continuity
      Key switch is "ON". (Key is inserted in IGN key cylinder.) Yes
      Key switch is "OFF". (Key is removed from IGN key cylinder.) No
      Fig 3: Checking Key Switch (Without Intelligent Key)
      G03106989Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK : Check the following.
      • 15A fuse [No. 22, located in fuse block (J/B)]
      • Harness for open or short between key switch and fuse
      • Harness for open or short between BCM and key switch
    2. NG : Replace key switch
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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.