Fuses and relays Mazda 3 bk (2003-2009) with decoding

This article discusses the fuse and relay diagrams of the Mazda 3 bk (Mazda 3bk) first generation, from the Japanese concern Mazda Motor Corporation, produced in 2003, 2004, 2005, 2006, 2007, 2008 and 2009 with engines of 1.4 liters, 1.6 liters . and 2.0 l.

Interesting fact: in its homeland (Japan) this model is called Mazda Axela.

During this time, the sedan and hatchback managed to undergo restyling.

The location and decoding of fuse and relay blocks may differ from that discussed below, depending on the configuration and modification, as well as the year of manufacture, of your Mazda 3 bk.

This vehicle is equipped with 2 main fuse and relay mounting blocks located in the passenger compartment and under the hood.

Fuses and relays in the cabin

The Mazda 3 bk interior mounting block of fuses and relays is located under the glove compartment on the passenger side.

Most fuses are located in this block.

In order to get to the cabin fuses and relays, you must:

  • Pull out the plastic clip from the right protective cover in the passenger footwell and move it to the side;

  • Remove the protective plastic fuse cover by pressing out the two plastic clips located on both sides of the protective cover;

  • Next, you need to rotate both fasteners (on both sides) by 90%, which hold the mounting block;

  • Now the block can be lowered down and pushed forward a little for the convenience of replacing fuses and relays, thanks to special bracket holders.


General view of the Mazda 3 bk interior fuse box


Diagram of fuses and relays in the Mazda 3 bk interior

No. on the diagramFuse ratingProtected circuit
3715 ACentral locking (D/LOCK 2)
38Empty or 10A (on later models; depending on configuration)Empty (Reserve); On later models - STOP LAMP Fuse, Horn (STOP LAMP/HORN)
3910 AHigh beam (Left headlight) (HEAD HIGH L)
4010 AHigh beam (Right headlight) (HEAD HIGH R)
41Empty (Reserved)
42Empty (Reserved)
4315 ACigarette lighter Mazda 3 (Lighter/Cigar)
447.5 AStereo, Audio system, Radio (RADIO)
4510 AElectric adjustment of side rear view mirrors (Mirror)
467.5 ADimensions (Right side front and rear marker lights), Number plate (registration plate) illumination (TAIL R)
4710 ADiagnostic connector (OBD)
48Empty (Reserved)
4920 AIgnition switch circuit (TR/Lock)
5010 AElectronic control unit for electrical equipment (CPU PWR, microcomputer start)
5115 AHazard lights (hazard warning lights) and turn signals (direction indicators) (HAZARDs)
5220 ASunroof (its electric drive) (SUN ROOF)
5320 AFront windshield washers (WASHER)
54Empty (Reserved)
5530 APower windows on the right side (front and rear) (P/WIND R)
5630 AWindow lifters on the left side (front and rear) (P/WIND L)
577.5 ASecurity alarm (ALARM)
587.5 AHeated exterior mirrors (electrically heated windows) (M/DEF)
59Empty (Reserved)
6015 ALow beam (Right headlight) (HEAD LOW R), lamp adjustment
6115 ALow beam (Left headlight) (HEAD LOW L), lamp adjustment
62Empty (Reserved)
63Empty (Reserved)
64Empty (Reserved)
6510 AAirbag system (SRS Airbag)
6610 AImmobilizer (anti-theft system), Instrument panel/instrumentation, ignition key interlock system (METER)
6720 AAnti-lock braking system (ABS), directional stability control (DSC), power steering and electric pump (EHPAS), (IGNITION)
6820 AWipers (windshield wipers) (WIPER)
6920 AElectronic engine management system (ENGINE)
7010 AEgnition lock; Automatic wiper (IG SIG) (some models)
717.5 AAirbag system (SRS 2)
72Empty (Reserved)
73Empty (Reserved)
7420 AHeated seats (heating) (SEAT WARM)
7525 ACentral locking (D/LOCK 1)
7610 AAir conditioning, air conditioning compressor clutch, (A/C)
7730 AFront right window regulator P/WIND R
7830 AFront left window regulator P/WIND L
7910 AReversing lights (lamp lights when moving backwards) (BACK)
807.5 ASunroof (electric) (SUN ROOF)
817.5 ATail light (left), front marker light (left) (TAIL L)
827.5 AFog lights (fog lights), instrument panel and control module lighting/illuminations (ILLUMI)
83Empty (Reserved)
84Empty (Reserved)
85Empty (Reserved)
86Empty (Reserved)

The cigarette lighter fuse is number 43 with a current of 15 Amps. Depending on the modification of the car, there may be other problems; we also recommend checking number 28 for 10 Amperes under the hood.

Relay box in the cabin

You can get to the main relay blocks/sensors in the Mazda 3 bk interior after you completely remove and disconnect from the plugs that fit it, the interior mounting block with fuses and open (unscrew) the white plastic case protecting the main board where the relays are located.


Remove the fuse and relay mounting block


The protective casing was removed. Assembly block disassembled.

The relay circuit is shown in the figure above along with the fuses. Explanation in the table below.

No. on the diagramProtected circuit
R11Relay for reduced (first) speed of front wipers (windshield wiper)
R12Relay for the second speed of the front wipers (windshield wipers)
R13High beam headlight relay unit
R14Relay for turning on side lights/lanterns
R15Empty (Reserved)
R16Empty (Reserved)
R17Relay for blocking the central locking drives (closing the lock)
R18Relay for unlocking the central locking drives (opening the lock)
R19Relay for turning on the rear wiper (wiper), if equipped
R20Empty (Reserved)

The video below clearly demonstrates the location of the relays responsible for the wipers and the removal of the mounting block where they are located.

Correct replacement of fuse links

Before replacing the Mazda 3 BC fuse, it is necessary to identify and eliminate the cause of the blown fusible link. To do this, the equipment corresponding to the protection zone is checked.

It is strictly forbidden to use various jumpers and fuse-links with a different rated current. This may cause electrical appliances to fail or catch fire.

The procedure for changing fusible links and relays of a Mazda 3 BK in the interior and engine compartment:

Initially, the protective casing is removed from the mounting blocks. Performing this procedure for blocks is described previously;


(Link to photo source)

Using tweezers, the damaged element is pulled out of the plastic. As a rule, the rupture of a burnt-out insert is visible visually after removal from the contact part. If the power fuses in the Mazda 3 BC block under the hood are damaged, you should remove the casing by pulling it up. In this case, the resistance of the plastic clamps is overcome.

Next, the two nuts securing the fuse-link are unscrewed and it is removed. If it is necessary to change the relay, then it must be slowly loosened from side to side and pulled out;

Then a spare protective element of the electrical circuit with similar current characteristics is installed.

On the back side of the Mazda 3 BK power unit casing there is a diagram of the location of fusible links and relays. There are also compartments for spare fuses and tweezers.

Fuses and relays under the hood

In the engine compartment, the fuse and relay box is located next to the battery.

In order to get to the “under-hood” fuses and relays, you need to remove the protective plastic cover by pulling the latch on the side of the mounting block and move it to the side.


General view of the block under the hood of Mazda 3 bk


Fuse and relay diagram in the engine compartment

DenominationProtected circuit
140 ACooling fan (radiator) (FAN)
280 AElectric power steering pump (P/ST - EHPAS)
340 AConnector for diagnostics, Hazard warning lights, Front wipers, front windshield washers, central locking, dimensions (BTN)
440 AHeadlights (HEAD)
580 APTC circuit (EPVA, cabin air heater) (On some models)
6(Blank) or 60 AEmpty (Reserve); in later models - 60 A glow plugs (GLOW)
730 ABrake system (ABS, abs), directional stability system (DSC) (anti-skid); [ABS1]
820 ABrake system (ABS, abs), directional stability system (DSC) (anti-skid); [ABS2]
930 AElectronic Engine Control Relay
10Empty (Reserved)
1130 AIgnition switch (lock) (electrical consumer circuits activated when the ignition is started and not turned off when the starter is turned on) (IG KEY1)
1220 AStarter solenoid relay (clutch)
1330 AIgnition switch (lock) (electrical consumer circuits activated when the ignition is started and turned off when the starter is turned on) (IG KEY2)
1430 AGlow plugs (some models) (GLOW1)
1540 AHeater (cabin fan) (HEATER)
1630 AGlow plugs (some models) (GLOW2)
1740 AHeated / Heated rear window (electric) (DEFOG)
1830 AEmpty (reserve); or -Audio system (for models equipped with a BOSE audio system) (AUDIO)
1910 AABS brake system (ABS), directional (anti-skid) stability system (DSC);
2015 AFront fog lights (fog lights) (FOG)
2115 ASound signal (horn, horn) (HORN)
2210 ADaytime running lights (DRL) on some models
2320 AHeadlight washers (H/CLEAN)
2415 AFuel pump (fuel pump) (F/PUMP)
2510 A(Power steering) Power steering (on some models) (P/ST IG)
2610 AAir Conditioning Compressor Electromagnetic Clutch (A/C MAG)
2710 AGenerator (ALT/TCM 1GA)
2810 ACigarette lighter (GLOWSIG)
2910 APower supply for additional car sockets (P.OUTLET)
3010 AEngine control unit PCM, control unit for dosing and supply of fuel additive (ENG+B)
3115 AInstrument cluster: Interior lighting lamps (interior lights, lampshades) (ROOM); RADIO (Audio system)
3210 AOxygen concentration sensor (ENG BAR 4)
3310 AOxygen concentration sensor (ENG BAR 3)
3410 AInjector pre-body, injector (EGI INJ)
3510 AMass Air Flow Sensor (MAF) Fuse (ENG BAR 1)
3610 A(USR) Exhaust gas recirculation system, valve (ENG BAR 2)

Relay under the hood

No. on the diagramProtected circuit
R1Fog lamp relay (fog lights) FOG
R2Horn Relay (HORN)
R3Heated/defogged rear windshield (DEFOG) relay
R4ETV circuit relay
R5Fuel heating relay for diesel models (F/WARM)
R6Fuel pump relay (CIRCUIT)
R7Empty (Reserved)
R8Empty (Reserved)
R9Headlight washer relay (H/CLEAN)
R10Climate control fan relay (heater) (HEATER)
R11Air Conditioning Relay (clutch, compressor) (A/C)
R12Empty (Reserved)
R13Starter relay (retractor) (STARTER)
R14Electronic engine control unit (MAIN)

Recommendations for servicing the mounting block

  • Periodically check the condition of the fuses, replace with new ones as necessary;
  • After long trips through puddles or in the rain, check for moisture and condensation in the mounting block. Dry the board with a stream of compressed air;
  • Install modules with similar current strength (amperage). Do not exceed (underestimate) Amperes;
  • If the mechanism suddenly stops functioning, do not rush to replace it with a new one. Check the module status, use a multimeter to diagnose;
  • During preventive maintenance, check the quality of fixation of terminals and limit switches. Press with pliers as needed.

Despite the apparent simplicity of the design of the mounting block, carry out diagnostic work at a service station. Unprofessional intervention in repairs leads to undesirable consequences.

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