Key Switch and Ignition Knob Switch Signal Inspection (With Intelligent Key, When Mechanical Key Is Used)

CHECK BCM INPUT SIGNAL
With CONSULT-II
1. Select "BCM".
2. With "DATA MONITOR" of "BUZZER", confirm "KEY ON SW" when the key is operated.
  "KEY ON SW"
  
  When key is inserted to ignition key cylinder : ON
  
  When key is removed from ignition key cylinder : OFF
  
  Fig 1: Displaying Data Monitor
  Courtesy of NISSAN MOTOR CO., U.S.A.
Without CONSULT-II

Check voltage between BCM harness connector M3 terminal 37 and ground.

37 - Ground

When key is inserted to ignition key cylinder : Approx. 12 V

When key is removed from ignition key cylinder : Approx. 0 V

Fig 2: Identifying Voltage Between BCM Harness Connector M3 Terminal 37 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK : INSPECTION END

NG : GO TO 2.
CHECK KEY SWITCH AND IGNITION KNOB SWITCH
1. Turn ignition switch OFF.
2. Disconnect key switch and ignition knob switch connector.
3. Check key switch and ignition knob switch. Refer to "KEY SWITCH AND IGNITION KNOB SWITCH ".
OK or NG

OK : GO TO 3.

NG : Replace key switch and ignition knob switch.
CHECK KEY SWITCH AND IGNITION KNOB SWITCH CIRCUIT
1. Disconnect BCM connector.
2. Check continuity between BCM harness connector M3 terminal 37 and key switch and ignition knob switch harness connector M22 terminal 4.
  37 - 4 : Continuity should exist.
3. Check continuity between BCM harness connector M3 terminal 37 and ground.
  37 - Ground : Continuity should not exist.
OK or NG

OK : GO TO 4.

NG : Repair harness or connector.

Fig 3: Identifying Continuity Between BCM Harness Connector M3 Terminal 37 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK KEY SWITCH POWER SUPPLY CIRCUIT
Check voltage between key switch and ignition knob switch harness connector M22 terminal 3 and ground.

3 - Ground : Battery voltage

OK or NG

OK : Replace BCM. Refer to "REMOVAL AND INSTALLATION OF BCM ".

NG : Check harness between key switch and ignition knob switch and fuse.

Fig 4: Identifying Voltage Between Key Switch And Ignition Knob Switch Harness Connector M22 Terminal 3 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.