Understanding the fuse layout in your 2004 Ford F-150 is crucial for diagnosing and resolving electrical issues, including those that might affect your OBD2 port and diagnostic readings. Fuses protect your vehicle’s electrical circuits from overloads, and knowing their locations can save you time and money on repairs. The 2004 Ford F-150 is equipped with multiple fuse boxes, each serving different systems. This guide will help you locate these fuse boxes and understand their diagrams, ensuring you can quickly identify and address any fuse-related problems, potentially even those impacting your ability to connect and read diagnostic information via the OBD2 port.
Decoding the 2004 Ford F-150 Fuse Box Layout
For the 2004 F-150 model, you’ll find not one, but three distinct fuse box locations. These are strategically placed to manage the complex electrical demands of your truck. Knowing where each is and what it controls is the first step to effective electrical system troubleshooting. Let’s explore each location to give you a comprehensive understanding of your 2004 Ford F-150’s fuse system.
Passenger Compartment Fuse Panel / Power Distribution Box
The primary fuse box, often referred to as the passenger compartment fuse panel or power distribution box, is typically the first place to check for many common electrical issues. This box is responsible for fuses and relays that control a wide array of interior and some exterior functions of your 2004 Ford F-150.
2004 Ford F-150 passenger compartment fuse panel diagram for power distribution.
Type | No. | Description |
---|---|---|
Fuse MINI 10A | 1 | Run/Accessory – Wipers, Instrument cluster |
Fuse MINI 20A | 2 | Stop/Turn lamps, Speed control deactivate switch |
Fuse MINI 5A | 3 | Power mirrors, Memory logic power, Memory seats and pedals |
Fuse MINI 10A | 4 | DVD battery power |
Fuse MINI 5A | 5 | Keep alive memory for Powertrain Control Module (PCM) and climate control module |
Fuse MINI 15A | 6 | Parklamps, BSM, Instrument panel illumination |
Fuse MINI 5A | 7 | Radio (start signal) |
Fuse MINI 10A | 8 | Heated mirrors, Switch indicator |
Fuse MINI 20A | 10 | Trailer tow back-up lamps relay (PCB1), Trailer tow parklamp relay (R201) |
Fuse MINI 10A | 11 | A/C clutch, 4×4 solenoid |
Fuse MINI 10A | 13 | Climate control module power |
Fuse MINI 10A | 14 | Back-up lamp and Daytime Running Lamps (DRL) relay coil, A/C pressure switch, Brake-shift interlock solenoid |
Fuse MINI 5A | 15 | Overdrive cancel, Cluster, Brake-Shift Interlock (BSI) |
Fuse MINI 10A | 16 | ABS module (Run/Start power) |
Fuse MINI 15A | 17 | Fog lamp relay (R202) |
Fuse MINI 10A | 18 | Run/Start feed – Flasher relay, Electrochromatic mirror, Heated seats, BSM, Compass, RSS (Reverse Sensing System) |
Fuse MINI 10A | 19 | Restraints (Air bag module) |
Fuse MINI 15A | 20 | PCM 4×4 power |
Fuse MINI 15A | 21 | Cluster keep alive power |
Fuse MINI 10A | 22 | Delayed accessory power for audio, power door lock switch and moonroof switch illumination |
Fuse MINI 10A | 23 | RH low beam headlamp |
Fuse MINI 15A | 24 | Battery saver power for demand lamps |
Fuse MINI 10A | 25 | LH low beam headlamp |
Fuse MINI 20A | 26 | Horn relay (PCB3), Horn power |
Fuse MINI 5A | 27 | Passenger Air bag Deactivation (PAD) warning lamp, Cluster air bag warning lamp, Cluster RUN /START power |
Fuse MINI 5A | 28 | SecuriLock transceiver (PATS) |
Fuse MINI 15A | 29 | PCM 4×4 power |
Fuse MINI 20A | 31 | Radio power |
Fuse MINI 15A | 32 | Vapor Management Valve (VMV), A/C clutch relay, Canister vent, Heated Exhaust Gas Oxygen (HEGO) sensors #11 and #21, CMCV, Mass Air Flow (MAF) sensor, VCT |
Fuse MINI 15A | 33 | Shift solenoid, CMS #12 and #22 |
Fuse MINI 20A | 34 | Fuel injectors and PCM power |
Fuse MINI 20A | 35 | Instrument cluster high beam indicator, High beam headlamps |
Fuse MINI 10A | 36 | Trailer tow right turn/stop lamps |
Fuse MINI 20A | 37 | Rear power point |
Fuse MINI 25A | 38 | Subwoofer power |
Fuse MINI 20A | 39 | Instrument panel power point |
Fuse MINI 20A | 40 | Low beam headlamps, DRL |
Fuse MINI 20A | 41 | Cigar lighter, Diagnostic connector power |
Fuse MINI 10A | 42 | Trailer tow left turn/stop lamps |
Fuse FMX/JCase 30A | 101 | Starter solenoid |
Fuse FMX/JCase 20A | 102 | Ignition switch feed |
Fuse FMX/JCase 20A | 103 | ABS valves |
Fuse FMX/JCase 30A | 105 | Electric trailer brakes |
Fuse FMX/JCase 30A | 106 | Trailer tow battery charge |
Fuse FMX/JCase 30A | 107 | Power door locks (BSM) |
Fuse FMX/JCase 30A | 108 | Passenger power seat |
Fuse FMX/JCase 30A | 109 | Driver power seat, Adjustable pedals |
Fuse FMX/JCase 30A | 111 | 4×4 relays |
Fuse FMX/JCase 40A | 112 | ABS pump power |
Fuse FMX/JCase 30A | 113 | Wipers and washer pump |
Fuse FMX/JCase 40A | 114 | Heated backlite, Heated mirror power |
Fuse FMX/JCase 30A | 116 | Blower motor |
Fuse FMX/JCase 30A | 118 | Heated seats |
Circuit breaker MAXI | 401 | Power windows, Moonroof, Power sliding backlite |
Relay | R01 | Starter solenoid |
Relay | R02 | Accessory delay |
Relay | R03 | Hi-beam headlamps |
Relay | R04 | Heated backlite |
Relay | R05 | Trailer tow battery charge |
Relay | R06 | Blower motor |
Relay | R201 | Trailer tow park lamps |
Relay | R202 | Fog lamps |
Relay | R203 | PCM |
Notably, fuse #41 (20A) in this panel is designated for “Cigar lighter, Diagnostic connector power.” If you’re experiencing issues with your OBD2 port not powering up or communicating, this fuse should be one of the first you inspect. A blown fuse here can directly impact your ability to perform vehicle diagnostics.
Auxiliary Relay Box (with DRL)
Some 2004 Ford F-150 models are equipped with Daytime Running Lights (DRL). If your truck includes this feature, it will have an auxiliary relay box specifically configured for DRL operation. This box, along with the main power distribution box, manages exterior lighting and related relays.
2004 Ford F-150 auxiliary relay box diagram with DRL for daytime running lights system.
Type | No. | Description |
---|---|---|
Fuse ATO 5A | F01 | Clockspring illumination |
Relay | R01 | 4×4 CCW |
Relay | R02 | 4×4 CW |
Relay | R03 | Daytime Running Lamps (DRL) [if equipped, otherwise not used] |
Relay | R201 | DRL |
Relay | R202 | A/C clutch |
Diode ATO | D01 | A/C clutch diode |
Auxiliary Relay Box (without DRL)
For 2004 Ford F-150 models not equipped with Daytime Running Lights, a slightly different auxiliary relay box is used. While similar in function to the DRL version, it omits the relays and fuses specifically for the daytime running lights system.
2004 Ford F-150 auxiliary relay box diagram without DRL for standard lighting system.
Type | No. | Description |
---|---|---|
Fuse ATO 5A | F01 | Clockspring illumination |
Relay | R01 | 4×4 CCW |
Relay | R02 | 4×4 CW |
Relay | R201 | DRL |
Relay | R202 | A/C clutch |
Diode ATO | D01 | A/C clutch diode |
By understanding the locations and functions of these fuse boxes in your 2004 Ford F-150, you are better equipped to maintain your vehicle’s electrical system and ensure that components like your OBD2 diagnostic port remain functional. Always refer to your vehicle’s owner’s manual for the most accurate and detailed information specific to your truck’s configuration.