Vehicle exterior, rear

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
Disconnect the connector from the keyless antenna.

Fig 1: Disconnecting Connector From Keyless Antenna
Courtesy of MAZDA MOTORS CORP.
CAUTION:
- Disconnect the connector while holding the keyless antenna, otherwise the keyless antenna bracket could be damaged.
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 bracket.
Remove the keyless antenna from the bracket.

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

Fig 3: Removing Keyless Antenna Bracket From Keyless Antenna
Courtesy of MAZDA MOTORS CORP.
Move the tape-wrapped flathead screwdriver in the direction of arrow (3) shown in the figure to press the keyless antenna bracket tab, and pull it in the direction of arrow (4) 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.