Audio Control Switch Inspection

Remove the driver-side air bag module.
Disconnect the audio control lever connector.
Measure the resistance and inspect for continuity between the audio control switch terminals using an ohmmeter.
- If not as specified, replace the audio control switch.
  
  Fig 1: Audio Control Switch Resistance Specifications
  Courtesy of MAZDA MOTORS CORP.
  
  Fig 2: Identifying Audio Control Switch Circuit & Connector Terminals
  Courtesy of MAZDA MOTORS CORP.