Sedan (4SD)

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Remove the A-pillar trim (RH). (See A-PILLAR TRIM REMOVAL/INSTALLATION .)
Remove the C-pillar trim (RH). (See C-PILLAR TRIM REMOVAL/INSTALLATION .)
Disconnect antenna feeder No. 1.

Fig 1: Disconnecting Antenna Feeder No. 1
Courtesy of MAZDA MOTORS CORP.
Disconnect antenna amplifier.

Fig 2: Locating Antenna Amplifier
Courtesy of MAZDA MOTORS CORP.
Verify that the continuity between antenna feeder No. 2 terminals is as indicated in the table.
NOTE:
- There are two types, a type A connector and type B connector, depending on the vehicle's period of manufacture.
Fig 3: Antenna Feeder No. 2 Terminals Continuity Chart
Courtesy of MAZDA MOTORS CORP.

Fig 4: Checking Continuity Between Antenna Feeder No. 2 Terminals
Courtesy of MAZDA MOTORS CORP.
- If not as indicated in the table, replace antenna feeder No. 2.