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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis >> External Pages >> Different car >> Section 1748 (Body, Lock & Security System (Sedan)) >> Intelligent Key System >> Check Key Switch (Intelligent Key Unit Input)
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Check Key Switch (Intelligent Key Unit Input)

WARNING: This page is about a different car, the 2006 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK KEY SWITCH 

    With CONSULT-II 

    Check key switch ("KEY SW") in "DATA MONITOR" mode with CONSULT- II.

    MONITOR ITEM AND CONDITION REFERENCE

    Monitor item Condition
    KEY SW Insert mechanical key into ignition switch: ON
    Remove mechanical key from ignition switch: OFF
    Fig 1: Display CONSULT-II - Data Monitor Screen
    G04122402Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. Turn ignition switch OFF.
    2. Disconnect Intelligent Key unit harness connector.
    3. Check voltage between Intelligent Key unit harness connector M75 terminal 7 and ground.
    TERMINALS VOLTAGE REFERENCE

    Connector Terminal (Wire color) Condition Voltage (V) (Approx.)
    (+) (-)
    M75 7 (B/P) Ground Insert mechanical key into ignition switch Battery voltage
    Remove mechanical key from ignition switch 0
    Fig 2: Identifying Voltage Between Intelligent Key Unit Harness Connector M75 Terminal 7 And Ground
    G04122403Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: Key switch is OK.
    • NG: GO TO 2.
  2. CHECK KEY SWITCH POWER SUPPLY CIRCUIT 
    1. Remove mechanical key from ignition switch.
    2. Disconnect key switch and ignition knob switch connector.
    3. Check voltage between key switch and ignition knob switch harness connector M310 terminal 3 and ground.

    3 (Y) - Ground : Battery voltage 

    Fig 3: Identifying Voltage Between Key Switch And Ignition Knob Switch Harness Connector M310 Terminal 3 And Ground
    G04122404Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 3.
    • NG: Repair or replace key switch and ignition knob switch power supply circuit.
  3. CHECK KEY SWITCH OPERATION 

    Check continuity between key switch and ignition knob switch harness connector M310 terminal 3 and 4.

    TERMINALS CONTINUITY REFERENCE

    Connector Terminal Condition Continuity
    M310 3 4 Insert mechanical key into ignition switch. Yes
    Remove mechanical key from ignition switch. No
    Fig 4: Identifying Continuity Between Key Switch And Ignition Knob Switch Harness Connector M310 Terminal 3 And 4
    G04122405Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 4.
    • NG: Replace key cylinder assembly (built-in key switch).
  4. CHECK KEY SWITCH CIRCUIT 
    1. Disconnect Intelligent Key unit connector.
    2. Check continuity between Intelligent Key unit harness connector M75 terminal 7 and key switch and ignition knob switch harness connector M310 terminal 4.

      7 (B/P) - 4 (B/P) : Continuity should exist. 

    3. Check continuity between Intelligent Key unit harness connector M75 terminal 7 and ground.

      7 (B/P) - Ground : Continuity should not exist. 

      Fig 5: Identifying Continuity Between Intelligent Key Unit Harness Connector M75 Terminal 7 And Ground
      G04122406Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: Check the condition of harness and harness connector.
    • NG: Repair or replace harness between Intelligent Key unit and key switch and ignition knob switch.
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