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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)) >> Power Door Lock System >> Check Key Switch
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Check Key Switch

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 INPUT SIGNAL 

    With CONSULT-II 

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

    Fig 1: Display CONSULT-II - Data Monitor Screen
    G04122280Courtesy of NISSAN MOTOR CO., U.S.A.
    • When key is inserted in ignition key cylinder

      KEY ON SW : ON 

    • When key is removed from ignition key cylinder

      KEY ON SW : OFF 

    Without CONSULT-II 

    Check voltage between BCM connector and ground.

    TERMINALS VOLTAGE REFERENCE

    Connector Terminals (wire color) Condition of key switch Voltage [V] Approx.
    (+) (-)
    M1 37 (B/P) Ground Key is inserted Battery voltage
    Key is removed 0
    Fig 2: Identifying Voltage Between BCM Connector And Ground
    G04122281Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: Key switch circuit is OK.
    • NG: GO TO 2. (with Intelligent Key)
    • NG: GO TO 3. (without Intelligent Key)
  2. CHECK KEY SWITCH (WITH INTELLIGENT KEY) 
    1. Turn ignition switch OFF.
    2. Disconnect key switch connector.
    3. Check continuity between key switch and ignition knob switch terminal 3 and 4.
    TERMINALS CONTINUITY REFERENCE

    Terminals Condition of key switch Continuity
    3 4 Key is inserted Yes
    Key is removed No
    Fig 3: Identifying Continuity Between Key Switch And Ignition Knob Switch Terminal 3 And 4
    G04122282Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: Check the following.
      • 15A fuse (No.33, located in fuse and fusible link block)
      • Harness for open or short between key switch and ignition knob switch and fuse.
      • Harness for open or short between BCM and key switch and ignition knob switch.
    • NG: Replace key switch.
  3. CHECK KEY SWITCH (WITHOUT INTELLIGENT KEY) 
    1. Turn ignition switch OFF.
    2. Disconnect key switch connector.
    3. Check continuity between key switch terminal 1and 2.
    TERMINALS CONTINUITY REFERENCE

    Terminals Condition of key switch Continuity
    1 2 Key is inserted Yes
    Key is removed No
    Fig 4: Identifying Continuity Between Key Switch Terminal 1 And 2
    G04122283Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: Check the following.
      • 10A fuse (No.21, located in fuse and fusible link block)
      • Harness for open or short between key switch and fuse.
      • Harness for open or short between BCM and key switch.
    • NG: Replace key switch.
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