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 and key switch harness connector M28 terminal 4.
  37 (B/R) - 4 (B/R): Continuity should exist.
3. Check continuity between BCM harness connector M34 terminal 37 and ground.
  37 (B/R) - Ground: Continuity should not exist.
  
  Fig 6: Checking Continuity Between BCM Harness Connector M34 Terminal 37 And Key Switch Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
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.