Key Switch Signal Inspection (Without Intelligent Key)

WARNING: This page is about a different car, the 2008 Infiniti FX45 and 2008 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK BCM INPUT SIGNAL
With CONSULT-III
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
  
  Without CONSULT-III
  
  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 1: 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
1. Turn ignition switch OFF.
2. Disconnect key switch connector.
3. Check key switch. Refer to "KEY SWITCH ".
OK or NG

OK: GO TO 3.

NG: Replace key switch.
CHECK KEY SWITCH CIRCUIT
1. Disconnect BCM connector.
2. Check continuity between BCM harness connector M3 terminal 37 and key switch harness connector M23 terminal 1.
  37 - 1 : Continuity should exist.
3. Check continuity between BCM harness connector M3 terminal 37 and ground.
  37 - Ground : Continuity should not exist.
  
  Fig 2: Identifying Continuity Between BCM Harness Connector M3 Terminal 37 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK: GO TO 4.

NG: Repair harness or connector.
CHECK KEY SWITCH POWER SUPPLY CIRCUIT

Check voltage between key switch harness connector M23 terminal 2 and ground.

2 - Ground : Battery voltage

OK or NG

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

NG: Check harness between key switch and fuse.

Fig 3: Identifying Voltage Between Key Switch Harness Connector M23 Terminal 2 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.