2004 Ford F-150 passenger compartment fuse panel diagram for power distribution.
2004 Ford F-150 passenger compartment fuse panel diagram for power distribution.

2004 Ford F-150 OBD2 Fuse Location: Your Guide to Electrical System Access

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.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.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.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.

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