The 2006 Ford F-250, a robust and reliable truck, incorporates a complex electrical system that relies on fuses to protect its various components. Understanding the fuse box locations and their specific functions is crucial for maintenance and troubleshooting. This guide will help you locate the OBD2 fuse and other essential fuses in your 2006 F-250.
Your Ford F-250 is equipped with three distinct fuse boxes, each serving different circuits: the passenger compartment fuse panel, the power distribution box under the hood, and an optional upfitter controls fuse box. Knowing the location of each and how to identify the correct fuse is essential for diagnosing electrical issues, especially those related to your OBD2 port.
Passenger Compartment Fuse Panel
The passenger compartment fuse panel is located inside the vehicle. This fuse box is often the first place to check for issues related to interior electrical components, and importantly, the OBD2 port.
Within this panel, you will find the fuse for the OBD II (On-Board Diagnostics II) system. Specifically, Fuse #12, a 20A MINI fuse, is designated for the Cigar lighter and OBD II port. If you are experiencing issues with your OBD2 scanner not powering on or connecting, this fuse should be your primary suspect. It’s also worth noting that this fuse is shared with the cigarette lighter, so if both are non-functional, Fuse #12 is highly likely to be the problem.
Here is a detailed table outlining the fuses in the passenger compartment fuse panel:
| Type | No. | Description |
|---|---|---|
| Fuse MINI 15A | 1 | Adjustable pedals |
| Fuse MINI 10A | 2 | Cluster |
| Fuse MINI 10A | 3 | Upfitter #3 |
| Fuse MINI 20A | 4 | Power point (Instrument panel) |
| Fuse MINI 10A | 5 | Upfitter #4 |
| Fuse MINI 30A | 7 | High beam headlamps, Flash-to-pass |
| Fuse MINI 20A | 8 | Back-up lamps |
| Fuse MINI 20A | 11 | Radio (Main) |
| Fuse MINI 20A | 12 | Cigar lighter, OBD II |
| Fuse MINI 5A | 13 | Power mirrors |
| Fuse MINI 15A | 17 | Exterior lamps |
| Fuse MINI 20A | 18 | Flasher, Brake On-Off (BOO) lamps |
| Fuse MINI 10A | 19 | Body Security Module (BSM) (Security) |
| Fuse MINI 15A | 20 | Trailer tow Electric Brake Controller (EBC) |
| Fuse MINI 20A | 21 | Heated seats |
| Fuse MINI 20A | 22 | Engine control |
| Fuse MINI 20A | 23 | Engine control [gasoline engine only] /Climate control [Diesel engine only] |
| Fuse MINI 15A | 24 | Tow haul, Blower relay, Electronic Automatic Temperature Control (EATC) |
| Fuse MINI 10A | 26 | Airbags |
| Fuse MINI 15A | 27 | Ignition switch RUN feed |
| Fuse MINI 10A | 28 | Trailer tow EBC logic |
| Fuse MINI 10A | 29 | Customer access |
| Fuse MINI 15A | 30 | High beam headlamps |
| Fuse MINI 15A | 31 | Starter relay |
| Fuse MINI 5A | 32 | Radio (start) |
| Fuse MINI 15A | 33 | Cluster, 4×4, Wipers |
| Fuse MINI 10A | 34 | BOO switch (Low current) |
| Fuse MINI 10A | 35 | Instrument cluster |
| Fuse MINI 15A | 37 | Horn |
| Fuse MINI 20A | 38 | Trailer tow park lamps |
| Fuse MINI 15A | 39 | Heated mirrors |
| Fuse MINI 20A | 40 | Fuel pump |
| Fuse MINI 10A | 41 | Instrument cluster |
| Fuse MINI 15A | 42 | Delayed accessory |
| Fuse MINI 10A | 43 | Fog lamps |
| Fuse MINI 10A | 45 | Ignition switch RUN/START feed |
| Fuse MINI 10A | 46 | Left-hand low beam headlamp |
| Fuse MINI 10A | 47 | Right-hand low beam headlamp |
| Fuse FMX/JCase 30A | 101 | Trailer tow EBC |
| Fuse FMX/JCase 30A | 102 | BSM (Door locks) |
| Fuse FMX/JCase 30A | 103 | Ignition switch |
| Fuse FMX/JCase 20A | 107 | Trailer tow battery charge |
| Fuse FMX/JCase 30A | 108 | Upfitter #1 |
| Fuse FMX/JCase 30A | 109 | Upfitter #2 |
| Fuse FMX/JCase 30A | 110 | Ignition switch |
| Fuse FMX/JCase 30A | 112 | Power seat (Driver) |
| Fuse FMX/JCase 30A | 113 | Starter |
| Fuse FMX/JCase 30A | 114 | Power seat (Passenger) |
| Fuse FMX/JCase 20A | 115 | Upfitter control |
| Fuse FMX/JCase 30A | 116 | Ignition switch |
| Circuit breaker MAXI | 601 | Delayed accessory, Power windows, Moonroof |
| Relay | 211 | Back-up lamps |
| Relay | 301 | Trailer tow battery charge |
| Relay | 302 | Powertrain Control Module (PCM) |
| Relay | 305 | Upfitter control |
| Relay | 306 | Delayed accessory |
| Relay | 307 | Starter |
Power Distribution Box
The power distribution box is located in the engine compartment. This box houses fuses and relays that protect engine and powertrain related systems. While the OBD2 port fuse is in the passenger compartment, understanding this box is helpful for overall vehicle electrical knowledge.
Below is the fuse and relay layout for the power distribution box:
| Type | No. | Description |
|---|---|---|
| Fuse FMX/JCase 30A | 1 | Wipers |
| Fuse FMX/JCase 40A | 2 | Blower |
| Fuse FMX/JCase 30A | 3 | Electronic Shift on the Fly (ESOF) |
| Fuse FMX/JCase 50A | 5 | Injector Driver Module (IDM) [Diesel engine only] |
| Fuse FMX/JCase 30A | 7 | Horizontal Fuel Conditioner Module (HFCM) [Diesel engine only] |
| Fuse FMX/JCase | 8 | Shunt |
| Fuse MINI 20A | 9 | Trailer tow turn signals |
| Fuse MINI 10A | 10 | Powertrain Control Module (PCM) keep alive power, Canister vent solenoid [gasoline engine only] |
| Fuse MINI 10A | 11 | Anti-lock Brake System (ABS) |
| Fuse MINI 2A | 12 | Brake pressure switch |
| Fuse MINI 15A | 13 | Daytime Running Lamps (DRL) |
| Fuse MINI 15A | 15 | IDM logic [Diesel engine only] |
| Fuse MINI 10A | 17 | A/C clutch |
| Fuse MINI 10A | 18 | IDM relay [Diesel engine only] |
| Fuse MINI 10A | 20 | Trailer tow back-up lamps |
| Fuse MAXI 60A | 22 | ABS (Coils) |
| Fuse MAXI 60A | 23 | ABS (Pump) |
| Relay | 201 | Trailer tow right turn signal/stop lamp |
| Relay | 202 | Trailer tow left turn signal/stop lamp |
| Relay | 203 | A/C clutch |
| Relay | 205 | DRL #1 |
| Relay | 206 | DRL #2 |
| Relay | 301 | DRL #3 |
| Relay | 302 | HFCM |
| Relay | 303 | Blower |
| Relay | 304 | IDM [Diesel engine only] |
Upfitter Controls Fuse Box (If Equipped)
Some 2006 Ford F-250 models are equipped with an additional upfitter controls fuse box. This is typically for aftermarket accessories and provides convenient, fused power sources.
The upfitter fuse box layout is simple, featuring relays and a single fuse:
| Type | Description |
|---|---|
| Relay | AUX 1 AUX 1 |
| Relay | AUX 2 AUX 2 |
| Relay | AUX 3 AUX 3 |
| Relay | AUX 4 AUX 4 |
| Fuse MINI 5A | FUSE FUSE 5A |
Conclusion
When diagnosing electrical problems in your 2006 Ford F-250, checking the fuses is a fundamental first step. For OBD2 port issues, specifically inspect Fuse #12 (20A) in the passenger compartment fuse panel. By understanding the location and function of each fuse box, you can efficiently troubleshoot and maintain your vehicle’s electrical system. Always refer to your vehicle’s owner’s manual for the most accurate and detailed fuse information specific to your truck’s configuration.
