Seat Belt Warning Chime Does Not Operate

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

CHECK WARNING CHIME OPERATION
1. With key removed from the ignition and the front door LH open, turn the lighting switch to 1st or 2nd position.
2. Return lighting switch to OFF position, and insert key into ignition.
Does warning chime sound for both steps?
- YES: GO TO 2.
- NO: Go to "ALL WARNING CHIMES DO NOT OPERATE ".
CHECK SEAT BELT WARNING LAMP OPERATION
Turn ignition switch ON. Buckle and unbuckle the driver seat belt while watching seat belt warning lamp.
- When seat belt is fastened: Warning lamp OFF
- When seat belt is unfastened: Warning lamp ON
OK or NG
- OK: Replace the BCM. Refer to "REMOVAL AND INSTALLATION OF BCM ".
- NG: GO TO 3.
CHECK COMBINATION METER INPUT SIGNAL
1. Turn ignition switch ON.
2. Check voltage between combination meter harness connector M24 terminal 27 (O/B) and ground.
  
  Fig 1: Combination Meter Harness Connector M24 Terminal 27 And Ground Voltage Specification Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Checking Voltage Between Combination Meter Harness Connector M24 terminal 27 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: Replace the combination meter. Refer to "COMBINATION METER ".
- NG: GO TO 4.
CHECK SEAT BELT BUCKLE SWITCH
1. Turn ignition switch OFF.
2. Disconnect seat belt buckle pre-tensioner assembly (seat belt buckle switch) LH connector.
3. Check continuity between seat belt buckle pre-tensioner assembly (seat belt buckle switch) LH terminals 1 and 2.
  
  Fig 3: Seat Belt Buckle Pre-Tensioner Assembly LH Terminals Continuity Specification Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 4: Checking Continuity Between Seat Belt Buckle Switch LH Terminals 1 And 2
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 5.
- NG: Replace the seat belt buckle pre-tensioner assembly (seat belt buckle switch) LH.
CHECK SEAT BELT BUCKLE SWITCH CIRCUIT
1. Disconnect combination meter connector.
2. Check continuity between combination meter harness connector M24 terminal 27 (O/B) and seat belt buckle pre-tensioner assembly (seat belt buckle switch) LH harness connector B74 terminal 1 (O/B).
  - Continuity should exist.
3. Check continuity between combination meter harness connector M24 terminal 27 (O/B) and ground.
  - Continuity should not exist.
  Fig 5: Checking Continuity Between Combination Meter Harness Connector M24 Terminal 27 And Seat Belt Buckle Switch LH Harness Connector B74 Terminal 1
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: Check seat belt buckle pre-tensioner assembly (seat belt buckle switch) LH ground circuit.
- NG: Repair harness or connector.