Mazda B-Series 2003 Fuse Box Info
Passenger compartment fuse box location:
The fuse box is located on the left-hand side of the instrument panel facing the driver’s side door.
Engine compartment fuse box location:
Fuse Box Diagram | Layout
Passenger compartment fuse box:
| Fuse/Relay N° | Rating | Functions |
| 1 | 5A | Power Mirror Switch |
| 2 | 10A | Daytime Running Lights (DRL), Back-up Lamps, Transmission, Passenger Air Bag Deactivation Switch, Blower Motor Relay |
| 3 | 7.5A | Left stop/turn trailer tow connector |
| 4 | - | Not Used |
| 5 | 15A | 4x4 Control Module |
| 6 | 2A | Brake pressure switch |
| 7 | 7.5A | Right stop/turn trailer tow connector |
| 8 | - | Not Used |
| 9 | 7.5A | Brake Pedal Position Switch |
| 10 | 7.5A | Speed Control Servo/Amplifier Assembly, Generic Electronic Module (GEM), Shift Lock Actuator, Turn Signals, 4x4 |
| 11 | 7.5A | Instrument cluster, 4x4, Main light switch, Central Security Module (CSM), Generic Electronic Module (GEM) |
| 12 | - | Not Used |
| 13 | 20A | Brake Pedal Position Switch |
| 14 | 10A | Anti-lock Brake System (ABS) control module |
| 15 | - | Not Used |
| 16 | 30A | Windshield Wiper Motor, Wiper Hi-Lo Relay, Wiper Run/Park Relay |
| 17 | 20A | Cigar Lighter, Data Link Connector (DLC) |
| 18 | - | Not Used |
| 19 | 25A | Powertrain Control Module (PCM) power diode, Ignition, PATS (Passive Anti-Theft System) |
| 20 | 7.5A | Generic Electronic Module (GEM), Radio |
| 21 | 15A | Flasher (Hazard) |
| 22 | 20A | Auxiliary Power Socket |
| 23 | - | Not Used |
| 24 | 7.5A | Clutch Pedal Position (CPP) switch, Starter Interrupt Relay |
| 25 | - | Not Used |
| 26 | 10A | Battery saver relay, Auxiliary relay box, Restraint Central Module (RCM), Generic Electronic Module (GEM), Instrument cluster |
| 27 | - | Not Used |
| 28 | 7.5A | Generic Electronic Module (GEM), Radio |
| 29 | 20A | Radio |
| 30 | - | Not Used |
| 31 | - | Not Used |
| 32 | - | Not Used |
| 33 | 15A | Headlamps, Daytime Running Lamps (DRL) Module, Instrument Cluster |
| 34 | - | Not Used |
| 35 | 15A | Horn Relay (If Not Equipped with Central Security Module) |
| 36 | - | Not Used |
Engine compartment fuse box (2.3L engine):
| Fuse/Relay N° | Rating | Functions |
| 1 | 50A | I/P Fuse Panel |
| 2 | - | Not Used |
| 3 | - | Not Used |
| 4 | - | Not Used |
| 5 | - | Not Used |
| 6 | 50A | Anti-lock Brake System (ABS) pump motor |
| 7 | 30A | Powertrain Control Module (PCM) |
| 8 | 20A | Central Security Module, Power Door Locks, Remote Entry |
| 9 | - | Not Used |
| 10 | - | Not Used |
| 11 | 50A | Starter Relay, Ignition Switch |
| 12 | 20A | Power Windows |
| 13 | - | Not Used |
| 14 | - | Not Used |
| 15 | - | Not Used |
| 16 | 40A | Blower Motor |
| 17 | 20A | Auxiliary Cooling Fan |
| 18 | - | Not Used |
| 19 | - | Not Used |
| 20 | - | Not Used |
| 21 | 10A | PCM Memory |
| 22 | - | Not Used |
| 23 | 20A | Fuel Pump Motor |
| 24 | 30A | Headlamps |
| 25 | 10A | A/C Clutch Relay |
| 26 | - | Not Used |
| 27 | - | Not Used |
| 28 | 30A | ABS Module |
| 29 | - | Not Used |
| 30 | 15A | Trailer Tow |
| 31 | 20A | Foglamp, Daytime Running Lamps (DRL) |
| 32 | - | Not Used |
| 33 | 15A | Park Lamp, Central Security Module |
| 34 | - | Not Used |
| 35 | - | Not Used |
| 36 | - | Not Used |
| 37 | - | Not Used |
| 38 | 10A | Left Headlamp Low Beam |
| 39 | - | Not Used |
| 40 | - | Not Used |
| 41 | 20A | Heated Oxygen Sensors |
| 42 | 10A | Right Headlamp Low Beam |
| 43 | - | (Resistor) |
| 44 | - | Not Used |
| 45A | - | Wiper High/Low Relay |
| 45B | - | Wiper Park/Run Relay |
| 46A | - | Fuel Pump Relay |
| 46B | - | Trailer Tow Relay |
| 47 | - | Starter Relay |
| 48 | - | Auxiliary Cooling Fan Relay |
| 49 | - | Not Used |
| 50 | - | Not Used |
| 51 | - | Not Used |
| 52 | - | Not Used |
| 53 | - | PCM Diode |
| 54 | - | PCM Relay |
| 55 | - | Blower Motor Relay |
| 56A | - | A/C Clutch Relay |
| 56B | - | Front Washer Pump Relay |
Engine compartment fuse box (3.0L and 4.0L engines):
| Fuse/Relay N° | Rating | Functions |
| 1 | 50A | I/P Fuse Panel |
| 2 | - | Not Used |
| 3 | - | Not Used |
| 4 | - | Not Used |
| 5 | - | Not Used |
| 6 | 50A | Anti-lock Brake System (ABS) Pump Motor |
| 7 | 30A | Powertrain Control Module (PCM) |
| 8 | 20A | Power door locks, Remote entry |
| 9 | - | Not Used |
| 10 | - | Not Used |
| 11 | 50A | Starter Relay, Ignition Switch |
| 12 | 20A | Power Windows |
| 13 | 20A | 4x4 motor |
| 14 | - | Not Used |
| 15 | - | Not Used |
| 16 | 40A | Blower Motor |
| 17 | - | Not Used |
| 18 | - | Not Used |
| 19 | - | Not Used |
| 20 | - | Not Used |
| 21 | 10A | Powertrain Control Module (PCM) memory |
| 22 | - | Not Used |
| 23 | 20A | Fuel Pump Motor |
| 24 | 30A | Headlamps |
| 25 | 10A | A/C clutch solenoid |
| 26 | - | Not Used |
| 27 | - | Not Used |
| 28 | 30A | Anti-lock Brake System (ABS) module |
| 29 | - | Not Used |
| 30 | 15A | Trailer Tow |
| 31 | 20A | Foglamp, Daytime Running Lamps (DRL) |
| 32 | - | Not Used |
| 33 | 15A | Park Lamp |
| 34 | - | Not Used |
| 35 | - | Not Used |
| 36 | - | Not Used |
| 37 | - | Not Used |
| 38 | 10A | Left Headlamp Low Beam |
| 39 | - | Not Used |
| 40 | - | Not Used |
| 41 | 20A | Heated Oxygen Sensors |
| 42 | 10A | Right Headlamp Low Beam |
| 43 | - | Not Used |
| 44 | - | Not Used |
| 45A | - | Wiper High/Low Relay |
| 45B | - | Wiper Park/Run Relay |
| 46A | - | Fuel Pump Relay |
| 46B | - | Trailer Tow Relay |
| 47A | - | A/C Clutch Solenoid Relay |
| 47B | - | Front Washer Pump Relay |
| 48A | - | Fog Lamps |
| 48B | - | Fog Lamp Relay |
| 51 | - | Not Used |
| 52 | - | Not Used |
| 53 | - | Powertrain Control Module (PCM) Diode |
| 54 | - | Powertrain Control Module (PCM) |
| 55 | - | Blower Relay |
| 56 | - | Starter Relay |
