Buckle Switch Inspection: Driver-side

Switch the ignition to off.
Disconnect the negative battery cable and wait for 1 min or more . (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Remove the front seat. (See FRONT SEAT REMOVAL/INSTALLATION .)
Remove the front buckle. (See FRONT BUCKLE REMOVAL/INSTALLATION .)
Inspect for continuity between the buckle switch terminals using a tester.
- If not as indicated in the table, replace the front buckle.
  
  Fig 1: Buckle Switch Terminals Continuity Reference Chart
  Courtesy of MAZDA MOTORS CORP.
  
  Fig 2: Buckle Switch Terminals Circuit Diagram
  Courtesy of MAZDA MOTORS CORP.