Audio Control Switch Inspection

WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

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.
Verify the resistance and continuity between the audio control switch terminals.
- If the resistance and continuity are not as indicated in the tables, replace the audio control light switch.
  
  Fig 1: Audio Control Switch Continuity Table
  Courtesy of MAZDA MOTORS CORP.
  
  Fig 2: Identifying Audio Control Switch Connector Terminals
  Courtesy of MAZDA MOTORS CORP.

AUDIO CONTROL UNIT RESISTANCE

Switch position	Resistance (ohm)
VOL-button ON	51-56
VOL+button ON	140-154
AUTO SCAN button ON	286-315
PRESET button ON	534-589
MODE button ON	985-1,080
MUTE button ON	1,940-2,130
OFF	4,800-5,290