Vehicle interior, front

WARNING: This page is about a different car, the 2016 Mazda CX-3. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery cable. (Refer to NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Remove the glove compartment. (Refer to GLOVE COMPARTMENT REMOVAL/INSTALLATION .)
Disconnect the connector from the keyless antenna.

Fig 1: Disconnecting Connector From Keyless Antenna
Courtesy of MAZDA MOTORS CORP.
While pressing the keyless antenna bracket tab in the direction of arrow (1) shown in the figure, press it in the direction of arrow (2) to detach the keyless antenna bracket tab from the instrument panel.

Fig 2: Pressing Keyless Antenna Bracket Tab
Courtesy of MAZDA MOTORS CORP.
Insert a tape-wrapped flathead screwdriver into the position shown in the figure.

Fig 3: Inserting Tape-Wrapped Flathead Screwdriver Into Position
Courtesy of MAZDA MOTORS CORP.
Move the tape-wrapped flathead screwdriver in the direction of arrow (1) shown in the figure to press the keyless antenna bracket tab, and pull it in the direction of arrow (2) to detach the keyless antenna bracket from the keyless antenna.
Remove the keyless antenna bracket from the keyless antenna.
Install in the reverse order of removal.