Audio Control Switch Inspection

Disconnect the negative battery cable.
Remove the driver-side air bag module. (See DUAL-STAGE DRIVER-SIDE AIR BAG MODULE .)
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: Audio Control Switch Position/Resistance Chart
Courtesy of MAZDA MOTORS CORP.

Fig 2: Identifying Audio Control Switch Circuit & Connector Terminals
Courtesy of MAZDA MOTORS CORP.