Key Switch System Inspection

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

CHECK KEY SWITCH SIGNAL
With CONSULT-II
- Insert and withdraw the key via "IGN KEY SW" on "DATA MONITOR" screen and make sure that the switch turns on and off accordingly.
  
  Fig 1: Checking Key Switch Signal With Consult II
  Courtesy of NISSAN MOTOR CO., U.S.A.
Without CONSULT-II
- Check voltage between BCM connector M4 terminal 69 (PU/W) and ground while inserting and withdrawing the key.
  
  Fig 2: Checking Voltage Between BCM Connector And Ground While Inserting And Withdrawing The Key (1 Of 2)
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Checking Voltage Between BCM Connector And Ground While Inserting And Withdrawing The Key (2 Of 2)
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: Key switch is OK.
2. NG: GO TO 2.
CHECK KEY SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect key switch connector.
3. Check voltage between key switch harness connector M64 terminal 3 (W) and ground.
  1. 3 (W) - Ground: Battery voltage should exist.
  Fig 4: Checking Voltage Between Key Switch Harness Connector And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 3.
2. NG: Check the following.
  - If the key switch 10A fuse is blown [No. 32 located in fuse block (J/B) No. 2]
  - Harness for open or short between key switch and fuse
CHECK KEY SWITCH
Check continuity between key switch terminals 3 and 4 while inserting and withdrawing ignition key.

Fig 5: Checking Continuity Between Key Switch While Inserting And Withdrawing Ignition Key (1 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 6: Checking Continuity Between Key Switch While Inserting And Withdrawing Ignition Key (2 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 4.
2. NG: Replace key switch.
CHECK KEY SWITCH CIRCUIT
1. Disconnect BCM connector.
2. Check continuity between BCM harness connector M4 terminal 69 (PU/W) and the key switch harness connector M64 terminal 4 (PU/W).
  1. 69 (PU/W) - 4 (PU/W): Continuity should exist.
  Fig 7: Checking Continuity Between BCM Harness Connector And Key Switch Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check continuity between BCM harness connector M4 terminal 69 (PU/W) and ground.
  1. 69 (PU/W) - Ground: Continuity should not exist.
OK or NG
1. OK: INSPECTION END
2. NG: Repair harness or connector.