Cruise Control Switch Inspection

Disconnect the negative battery cable.
Remove the driver-side air bag module. See DRIVER-SIDE AIR BAG MODULE .
Disconnect the cruise control switch connector.
Measure the resistance and inspect for continuity between the cruise control switch terminals using an ohmmeter.

Fig 1: Cruise Control Switch Continuity Check
Courtesy of MAZDA MOTORS CORP.

Fig 2: Identifying Cruise Control Switch Terminals & Circuits
Courtesy of MAZDA MOTORS CORP.