Audio Unit Removal: Standard

Disconnect the negative battery cable.
Remove the hole covers by inserting a small tape-wrapped screwdriver into the slot and carefully pry them off without scratching the center panel. Pry up and pull off the hole covers carefully to prevent the posts from breaking off.
With the beveled parts of the SSTs facing inward, insert them into the unit.
NOTE:
- Two sets of the SSTs are necessary to remove the audio unit.
Fig 1: Removing Hole Covers By Inserting Small Tape-Wrapped Screwdriver Into Slot
Courtesy of MAZDA MOTORS CORP.
Pull the SST outward and forward to slide out the unit.
Disconnect the connectors and antenna jack.

Fig 2: Pulling SST Outward And Forward To Slide Out Unit (Standard)
Courtesy of MAZDA MOTORS CORP.