Audio Control Switch Inspection

Disconnect the negative battery cable.
Remove the driver-side air bag module. (See DRIVER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION. )
Disconnect the audio control switch connector.
Measure the resistance and inspect for continuity between the cruise control switch terminals using an ohmmeter.
- If not as specified, replace the cruise control switch.
  
  Fig 1: Checking Cruise Control Switch Resistance
  Courtesy of MAZDA MOTORS CORP.
  
  Fig 2: Identifying Cruise Control Switch Connector Terminals
  Courtesy of MAZDA MOTORS CORP.