Check Key Switch

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

CHECK KEY SWITCH INPUT SIGNAL
With CONSULT-II

Check ignition key switch "IGN ON SW" in "DATA MONITOR" mode with CONSULT-II.
- When key is inserted in ignition key cylinder
  KEY ON SW: ON
- When key is removed from ignition key cylinder
  KEY ON SW: OFF
  
  Fig 1: CONSULT-II Function Display Data Monitor
  Courtesy of NISSAN MOTOR CO., U.S.A.
Without CONSULT-II

Check voltage between BCM connector and ground.

Fig 2: Terminal Voltage Chart
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 3: Checking Voltage Between BCM Connector And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: Key switch circuit is OK
2. NG: GO TO 2.
CHECK KEY SWITCH
Check continuity between key switch connector M28 terminals 3 and 4.

Fig 4: Terminal Continuity Chart
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 5: Checking Continuity Between Key Switch Connector M28 Terminals 3 And 4
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 3.
2. NG: Replace key switch.
CHECK KEY SWITCH CIRCUIT
1. Disconnect BCM connector.
2. Check continuity between BCM harness connector M34 terminal 37 (B/R) and key switch harness connector M28 terminal 4 (B/R).
  37 (B/R) - 4 (B/R): Continuity should exist.
3. Check continuity between BCM harness connector M34 terminal 37 (B/R) and ground.
  37 (B/R) - Ground: Continuity should not exist.
OK or NG
1. OK: Check the following.
  - 10A fuse [No.21, located in the fuse block (J/B)]
  - Harness for open or short between key switch and fuse
2. NG: Repair harness or connector.
  
  Fig 6: Checking Continuity Between BCM Harness Connector M34 Terminal 37 (B/R) And Key Switch Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.