Mazda CX-9 (2018-2020) – fuse and relay box
Diagrams of fuse boxes and relays – Mazda CX-9
Applies to vehicles manufactured in the years:
2018, 2019, 2020.
Engine compartment
| Number | Amperes [A] | Description |
| 1 | 20 A. | Windshield wiper de-icer (some models) |
| 2 | 30 A. | To protect various circuits |
| 3 | 30 A. | Engine control system |
| 4 | – | – |
| 5 | 30 A. | – |
| 6 | 30 A. | 2018-2019: unused;
2020: Electric seat |
| 7 | – | – |
| 8 | 20 A. | Engine control system |
| 9 | 40 A. | Rear window defogger |
| 10 | 20 A. | 2018-2019: unused;
2020: Heated steering wheel |
| 11 | 40 A. | Air conditioner |
| 12 | 20 A. | Electric Parking Brake (EPB) (Left) |
| 13 | 40 A. | Public address system |
| 14 | 20 A. | Electric Parking Brake (EPB) (right) |
| 15 | 40 A. | Engine control system |
| 16 | 50 A. | ABS;
Dynamic stability control system. |
| 17 | 50 A. | To protect various circuits |
| 18 | 20 A. | Windshield wiper and washer |
| 19 | 40 A. | Air conditioner |
| 20 | – | – |
| 21 | 7.5 amps | Engine control system |
| 22 | 15 A. | To protect various circuits |
| 23 | 15 A. | Low beam (left) |
| 24 | 15 A. | – |
| 25 | 15 A. | Engine control system |
| 26 | 15 A. | Engine control system |
| 27 | 15 A. | Engine control system |
| 28 | 15 A. | 2018: Gearbox control system;
2019-2020: Gearbox control system, ignition switch |
| 29 | 20 A. | – |
| 30 | 7.5 amps | Air conditioner |
| 31 | 15 A. | – |
| 32 | 10 A. | Stop lights |
| 33 | 15 A. | 2018: Rear window wiper;
2019-2020: Rear window wiper, anti-theft system (some models) |
| 34 | 20 A. | Headlamp high beam |
| 35 | 15 A. | Low beam (right) |
| 36 | 15 A. | Fog lights (some models) |
| 37 | 7.5 amps | Engine control system |
| 38 | 7.5 amps | Audio system (some models) |
| 39 | 10 A. | 2018: Top light;
2019-2020: For the protection of various circuits |
| 40 | 15 A. | – |
| 41 | 10 A. | Instrument cluster |
| 42 | 7.5 amps | Airbag |
| 43 | 10 A. | Audio system (some models) |
| 44 | 25 A. | Audio system (some models) |
| 45 | 30 A. | ABS;
Dynamic stability control system. |
| 46 | – | – |
| 47 | 15 A. | 2018-2019: Heated steering wheel (some models);
2020: Not used |
| 48 | 15 A. | Parking lights |
| 49 | 25 A. | Fuel system |
| 50 | 25 A. | Emergency lights;
Direction indicators; Rear lights. |
| 51 | 15 A. | Day lights |
| 52 | 15 A. | Accessory sockets |
| 53 | 15 A. | Horn |
| 54 | 25 A. | To protect various circuits |
Passenger compartment (left side)
| Number | Amperes [A] | Description |
| 1 | 30 A. | Electric seat (some models) |
| 2 | 30 A. | Electric windows |
| 3 | 15 A. | Accessory sockets |
| 4 | 25 A. | Electric windows |
| 5 | 20 A. | Electric liftgate (some models) |
| 6 | 25 A. | Electric door locks |
| 7 | 20 A. | seat pad (some models) |
| 8 | 15 A. | Trailer hitch (some models) |
| 9 | 10 A. | Sunroof (some models) |
| 10 | 15 A. | Public address system |
| 11 | 7.5 amps | Engine control system |
| 12 | 7.5 amps | Power control mirror |
| 13 | 7.5 amps | AT gear shift indicator |
| 14 | 15 A. | Accessory sockets |
| 15 | 15 A. | Accessory sockets (some models) |
| 16 | 15 A. | 2018-2019: unused;
2020: USB socket. |
| 17 | 7.5 amps | Mirror defogger (some models) |
| 18 | 20 A. | Heated seats (some models) |
| 19 | 15 A. | Public address system |
| 20 | 30 A. | 2018-2019: unused;
2020: Electric seat |
| 21 | 30 A. | Electric seat (some models) |