Driver Side

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Switch the ignition to off.
Disconnect the negative battery cable.
Remove the front seat. . FRONT SEAT REMOVAL/INSTALLATION .
Remove the front buckle. . 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: Switch Circuit Continuity Chart
  Courtesy of MAZDA MOTORS CORP.
  
  Fig 2: Buckle Switch Circuit Diagram
  Courtesy of MAZDA MOTORS CORP.