Front seat back

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

Switch the ignition to off.
Disconnect the negative battery terminal and wait1 min or more. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .)
Disconnect the passenger-side seat warmer unit connector.
Inspect for continuity between the passenger-side seat warmer unit connector (short cord) terminal A-B.

Courtesy of MAZDA MOTORS CORP.

Courtesy of MAZDA MOTORS CORP.
- If not as indicated in the table, replace the front seat back component. (See FRONT SEAT BACK COMPONENT REMOVAL/INSTALLATION (US) .)