Understanding your 2002 Ford F-250’s fuse box is crucial for maintaining its electrical system. This guide focuses on the OBD2 fuse, a vital component for diagnostics and troubleshooting. Locating the correct fuse and understanding its function can save you time and prevent unnecessary trips to the mechanic.
The 2002 Ford F-250 fuse box, typically located inside the vehicle, houses a variety of fuses protecting different circuits. Among these, fuse number 12, a 20A MINI fuse, is designated for the “Cigar lighter / OBD II”. This means that the same fuse powers both your cigarette lighter and the On-Board Diagnostics II (OBD2) port.
If you’re experiencing issues with your OBD2 port not powering up your diagnostic scanner, or if your cigarette lighter isn’t working, checking fuse #12 should be your first step. A blown fuse is a common cause for a non-functional OBD2 port, preventing you from reading trouble codes or performing emissions testing.
Here is a detailed fuse box diagram for the 2002 Ford F-250 to help you locate fuse #12 and other essential fuses:
| Type | No. | Description |
|---|---|---|
| Fuse MINI 15A | 1 | Adjustable pedals |
| Fuse MINI 20A | 4 | Power point – IP |
| Fuse MINI 30A | 7 | High beam headlamps / Flash to pass |
| Fuse MINI 10A | 10 | A/C clutch |
| Fuse MINI 20A | 11 | Radio (main) |
| Fuse MINI 20A | 12 | Cigar lighter / OBD II |
| Fuse MINI 10A | 13 | Power mirrors, BSM lock switches |
| Fuse MINI 15A | 14 | Daytime running lamps |
| Fuse MINI 15A | 17 | Exterior lamps |
| Fuse MINI 20A | 18 | Turn lamps / Brake on-off switch (high) |
| Fuse MINI 10A | 19 | BSM (Security)/4×4 module |
| Fuse MINI 20A | 22 | Engine control (priority C loads) |
| Fuse MINI 20A | 23 | Engine control (priority B loads) |
| Fuse MINI 15A | 24 | Rear air suspensión |
| Fuse MINI 10A | 25 | 4-Wheel Anti-Lock Brake System (4WABS) module |
| Fuse MINI 10A | 26 | Airbags |
| Fuse MINI 15A | 27 | General run fuse feed #1 |
| Fuse MINI 10A | 29 | Customer access |
| Fuse MINI 15A | 30 | Highbeam headlamps |
| Fuse MINI 15A | 31 | Clutch interlock switch |
| Fuse MINI 5A | 32 | Radio (start) |
| Fuse MINI 15A | 33 | Front smart wiper (accessory) |
| Fuse MINI 10A | 34 | Brake on-off switch (low) |
| Fuse MINI 10A | 35 | Cluster #2 |
| Fuse MINI 10A | 36 | PCM Keep-Alive |
| Fuse MINI 15A | 37 | Horn |
| Fuse MINI 20A | 38 | Trailer tow park lamps and backup lamps |
| Fuse MINI 20A | 40 | Fuel pump |
| Fuse MINI 10A | 41 | Cluster (#1) |
| Fuse MINI 15A | 42 | Delayed accessory (Sw backlite/radio) |
| Fuse MINI 10A | 43 | Fog lamps |
| Fuse MINI 10A | 44 | PATS module, Transceiver |
| Fuse MINI 10A | 45 | General Run/ Start fuse feed #1 |
| Fuse MINI 10A | 46 | Left-hand lowbeam |
| Fuse MINI 10A | 47 | Right-hand lowbeam |
| Fuse FMX/JCase 30A | 101 | Trailer to electric brake |
| Fuse FMX/JCase 30A | 102 | BSM/Door locks |
| Fuse FMX/JCase 50A | 103 | Ignition switch (B4 Input) |
| Fuse FMX/JCase 30A | 105 | Injector driver module |
| Fuse FMX/JCase 30A | 106 | Front smart wiper (battery) |
| Fuse FMX/JCase 40A | 107 | Front blower motor |
| Fuse FMX/JCase 30A | 109 | Heated seats |
| Fuse FMX/JCase 50A | 110 | Ignition switch (B1/B3 input) |
| Fuse FMX/JCase 30A | 111 | 4WD/Shift on the fly |
| Fuse FMX/JCase 30A | 112 | Left-hand power seats |
| Fuse FMX/JCase 30A | 113 | Starter motor |
| Fuse FMX/JCase 30A | 114 | Right-hand power seats |
| Fuse FMX/JCase 40A | 115 | Trailer tow turn /sStop and battery charge |
| Fuse FMX/JCase 30A | 116 | Ignition switch (B5 input) |
| Circuit breaker MAXI | 601 | Door window motors |
| Fuse MAXI 60A | 602 | 4WABS module |
| Relay | 210 | Trailer tow left-hand turn /stop relay |
| Relay | 212 | Trailer tow right-hand turn /stop relay |
| Relay | 301 | Front blower motor relay |
| Relay | 302 | Powertrain (EEC) relay |
| Relay | 303 | Injector driver module relay (Diesel only) |
| Relay | 305 | Trailer tow battery charge relay |
| Relay | 306 | Delayed accessory relay |
| Relay | 307 | Starter relay |
Comprehensive 2002 Ford F-250 Fuse Box Diagram
This table details each fuse, its amperage, and the systems it protects in your 2002 F-250. Remember to always replace a blown fuse with one of the same amperage to avoid damaging your vehicle’s electrical system. If you frequently experience blown fuses, it’s recommended to consult a qualified mechanic to diagnose the underlying issue. For OBD2 port problems specifically, always check fuse #12 first as a simple and quick troubleshooting step.
