The Mazda 3 was introduced in 2003 and offered in two body styles: hatchback and sedan. In 2006, the model underwent a mid-cycle facelift. This article provides a detailed breakdown of the fuse box diagrams for the first-generation Mazda 3 (BK chassis; Ford C1 platform) covering model years 2003 through 2009.
Below you will find the locations, photos, and diagrams for the power distribution boxes. Fuses for the “Cigarette Lighter” and “Fuel Pump” are highlighted in bold.
In the Engine Compartment
Located near the left inner fender, beneath a protective cover.
1. To access the engine compartment fuse and relay block, release the latch at the rear of the box.
2. Lift off the cover.
General overview.
| Diagram | ||
|---|---|---|
|
||
| No. | Rating (A) | Description |
| 1 | 40 | Radiator cooling fan |
| 2 | 80 | Electro-hydraulic power steering (EHPAS) pump |
| 3 | 40 | Diagnostic connector (OBD-II), anti-theft alarm, windshield washer, central locking, parking lights |
| 4 | 40 | Headlights |
| 5 | - | Spare |
| 6 | * | |
| 7 | 30 | ABS, Dynamic Stability Control (DSC) |
| 8 | 20 | ABS, Dynamic Stability Control (DSC) |
| 9 | 30 | Powertrain Control Module (PCM) main relay |
| 10 | - | Not used |
| 11 | 30 | Ignition switch circuit |
| 12 | 20 | Starter relay |
| 13 | 30 | Ignition switch circuit |
| 14 | - | Not used |
| 15 | 40 | Climate control / HVAC system |
| 16 | - | Not used |
| 17 | 40 | Heated rear window (defroster) |
| 18 | - | Not used |
| 19 | 10 | ABS, Dynamic Stability Control (DSC) module |
| 20 | 15 | Front fog lights |
| 21 | 15 | Horn, stop lights |
| 22 | - | Not used |
| 23 | 20 | Headlight washers |
| 24 | 15 | Fuel pump fuse |
| 25 | - | Not used |
| 26 | 10 | A/C compressor magnetic clutch |
| 27 | 10 | Generator / Alternator |
| 28 | - | Not used |
| 29 | - | |
| 30 | 10 | Engine control system (PCM) |
| 31 | 15 | Instrument cluster, central locking, interior lighting |
| 32 | 10 | Engine management system (PCM) |
| 33 | ||
| 34 | ||
| 35 | ||
| 36 | ||
| R1 | Front fog light relay | |
| R2 | Horn relay | |
| R3 | Heated rear window relay | |
| R4 | Not used | |
| R5 | Heated rear window relay | |
| R6 | Fuel pump relay | |
| R7 | Not used | |
| R8 | ||
| R9 | Headlight washer relay | |
| R10 | HVAC blower fan relay | |
| R11 | A/C compressor magnetic clutch relay | |
| R12 | Not used | |
| R13 | Solenoid actuator relay | |
| R14 | Powertrain Control Module (PCM) relay | |
In the Passenger Compartment
To access the passenger compartment fuse and relay block, proceed as follows:
1. Remove the plastic retainer securing the right-hand floor console side trim panel.
2. Detach and remove the cover plate.
3. Turn the two plastic fasteners securing the lower fuse box cover (cover removed for clarity).
4. Remove the lower cover.
5. Turn the two module latches 90 degrees and swing the assembly down.
6. Pull the junction box assembly forward to access the fuses.
Overview of the interior passenger compartment fuse box (Mazda 3 BK).
| Diagram | ||
|---|---|---|
|
||
| No. | Rating (A) | Description |
| 37 | 15 | Central locking system |
| 38 | - | Not used |
| 39 | 10 | Left high-beam headlight |
| 40 | 10 | Right high-beam headlight |
| 41 | - | Not used |
| 42 | - | Not used |
| 43 | 15 | Cigarette lighter / auxiliary power outlet |
| 44 | 7.5 | Audio system |
| 45 | 10 | Power exterior mirrors |
| 46 | 7.5 | Right-side parking lights / tail lights |
| 47 | 10 | Diagnostic connector (OBD-II) |
| 48 | - | Not used |
| 50 | 20 | Ignition switch circuit |
| 51 | 10 | Body Control Module (BCM) |
| 52 | 15 | Hazard warning lights and turn signals |
| 53 | 20 | Power sunroof |
| 54 | 20 | Windshield and rear window washers |
| 55 | Not used | |
| 56 | 30 | Right power windows |
| 57 | 30 | Left power windows |
| 58 | 7.5 | Horn |
| 59 | 7.5 | Heated door mirrors |
| 60 | Not used | |
| 61 | 15 | Right low-beam headlight |
| 62 | 15 | Left low-beam headlight |
| 63 | Not used | |
| 64 | ||
| - | ||
| 64 | 10 | Supplemental Restraint System (SRS) / Airbags |
| 65 | 10 | Engine immobilizer, instrument cluster, ignition key interlock |
| 66 | 20 | ABS, Dynamic Stability Control (DSC), power steering control module |
| 67 | 20 | Windshield wipers |
| 68 | 20 | Powertrain Control Module (PCM/ECU) |
| 69 | 10 | Ignition switch lock |
| 70 | 7.5 | Airbag control module (SRS) |
| 71 | - | Not used |
| 72 | - | |
| 73 | 20 | Heated seats |
| 74 | 25 | Central power door locks |
| 75 | 10 | A/C compressor clutch relay |
| 76 | 30 | Right front power window |
| 77 | 30 | Left front power window |
| 78 | 10 | Reverse lights, instrument cluster |
| 79 | 7.5 | Power sunroof |
| 80 | 7.5 | Left-side parking lights / tail lights |
| 81 | 7.5 | Fog lights, instrument panel illumination and indicator lights |
| 82 | - | Not used |
| 83 | - | |
| 84 | - | |
| 85 | - | |
| 86 | ||
| R15 | Not used | |
| R16 | ||
| R17 | Central locking relay | |
| R18 | Door unlock relay | |
| R19 | Rear window wiper relay | |
fuse 79 is 10a and is the reverse light