Understanding the fuse box in your 2005 Ford Crown Victoria is crucial for diagnosing and resolving electrical issues. Fuses protect your vehicle’s electrical circuits from overloads, and knowing their locations and functions can save you time and money on repairs. This guide will specifically focus on the OBD2 fuse within the 2005 Ford Crown Victoria, providing a comprehensive overview of both fuse box locations and their diagrams.
The 2005 Ford Crown Victoria utilizes two distinct fuse boxes to manage its electrical systems: the Passenger Compartment Fuse Panel and the Power Distribution Box. Each box serves different circuits, and it’s important to understand where each is located and what fuses it contains, especially when troubleshooting issues related to your OBD2 port.
Passenger Compartment Fuse Panel
The passenger compartment fuse panel is located inside the vehicle. Knowing its exact location is the first step to accessing and inspecting fuses, including the one for your OBD2 port.
This fuse box is responsible for many of the interior and accessory functions of your Crown Victoria. Let’s examine the fuses within this panel in detail:
| Type | No. | Description |
|---|---|---|
| Fuse MINI 15A | 1 | Taxi, Cluster, Lighting Control Module (Interior Lighting) |
| Fuse MINI 10A | 2 | Ignition (ON) Electronic Automatic Temperature Control (EATC) module, A/C mode switch (vehicles equipped with EATC only) |
| Fuse MINI 10A | 3 | EATC module (vehicles equipped with EATC only) Audio (base audio system on vehicles not equipped with EATC) |
| Fuse MINI 10A | 4 | Ignition (ON) Anti-lock Brake System (ABS) module, Positive Crankcase Ventilation (PCV) |
| Fuse MINI 10A | 5 | Speed control deactivation switch, Stop signal, Brake-Transmission Shift Interlock (BTSI) (column-shift transmission) |
| Fuse MINI 10A | 6 | Ignition (ON) – Cluster |
| Fuse MINI 10A | 7 | LCM (Park lamps, Switch illumination) |
| Fuse MINI 10A | 8 | Ignition (ON) – Rear Air Suspensión Module (RASM), Variable Assist POwer Steering (VAPS) |
| Fuse MINI 20A | 9 | LCM (Headlamps, Cornering lamps) |
| Fuse MINI 5A | 10 | Ignition (ON/START) – Driver’s Door Module (DDM), Police PDB (Police vehicles only) |
| Fuse MINI 10A | 11 | Ignition (START) – ON/ACC (window) relay coil (non-Police vehicles only) Ignition (START) – ON/ACC (window and decklid) relay coil and Police ON/ACC relay coil (Police vehicles only) |
| Fuse MINI 10A | 12 | Ignition (ON/START) – Starter relay coil, DTRS |
| Fuse MINI 10A | 13 | Ignition (START) – Wiper module |
| Fuse MINI 10A | 14 | Ignition (ON) – BTSI (Floor-shift transmission) |
| Fuse MINI 7.5A | 15 | Ignition (START) – LCM, Door lock switch illumination, Heated seat switch illumination, Moonroof, Overhead console, Electrochromatic mirror |
| Fuse MINI 15A | 16 | Ignition (ON) – Turn signals |
| Fuse MINI 10A | 17 | Ignition (START) – Audio |
| Fuse MINI 10A | 18 | Ignition (ON) – A/C mode switch (manual A/C only), Blend door, DDM, Heated seat modules, Daytime Running Lamps (DRL) module |
| Fuse MINI 10A | 19 | Left-hand low beam, DRL |
| Fuse MINI 10A | 20 | Ignition (ON/ACC) – Back-up lamps |
| Fuse MINI 10A | 21 | Right-hand low beam, DRL |
| Fuse MINI 10A | 22 | Ignition (ON/ACC) – Restraint Control Module (RCM), Occupant Classification Sensor (OCS), Passenger Air bag Deactivation Indicator (PADI) |
| Fuse MINI 15A | 23 | Multi-function switch (Flash-to-pass) |
| Fuse MINI 10A | 24 | Ignition (ON/ACC) – Passive Anti-Theft System (PATS) module, Powertrain Control Module (PCM) relay coil, Fuel relay coil, Ignition coil relay coil |
| Fuse MINI 10A | 25 | Autolamp/Sunload sensor, Power mirrors, Door lock switches (DDM), Adjustable pedal switch |
| Fuse MINI 10A | 26 | Ignition (ON/ACC) – Analog cluster, Warning lamp module, LCM, Overdrive cancel switch, Rear defroster relay coil |
| Fuse MINI 20A | 27 | Cigar lighter, OBD II, Power point |
| Fuse MINI 10A | 28 | Center High-Mounted Stop Lamp (CHMSL) |
| Fuse MINI 15A | 29 | Audio |
| Fuse MINI 15A | 30 | Stop lamps, MFS |
| Fuse MINI 15A | 31 | Hazards (non-Police vehicles) |
| Fuse MINI 20A | 31 | Hazards (Police vehicles) |
| Fuse MINI 10A | 32 | Mirror heaters, Rear defroster switch indicator |
| Relay | K101 | Rear defroster |
Locating the OBD2 Fuse:
As highlighted in the table above, Fuse #27 in the Passenger Compartment Fuse Panel is designated for the Cigar lighter, OBD II, and Power point. This is the fuse you need to check if you are experiencing issues with your OBD2 port, such as a scanner not powering on when connected. It’s a 20A MINI fuse.
If your OBD2 scanner is not working, a blown Fuse #27 is a common culprit. Before replacing the fuse, it’s crucial to identify the underlying cause of the fuse blowing to prevent recurrence.
Power Distribution Box
The second fuse box is the Power Distribution Box, typically located in the engine compartment. This box houses fuses and relays that manage higher-current systems in your 2005 Ford Crown Victoria.
Here’s a breakdown of the components within the Power Distribution Box:
| Type | No. | Description |
|---|---|---|
| Fuse MINI 20A | 1 | Ignition switch (Key in, RUN 1, RUN 2) |
| Fuse MINI 25A | 2 | Ignition switch (RUN/START, RUN/ACC, START) |
| Fuse MINI 10A | 3 | Powertrain Control Module (PCM) keep alive power |
| Fuse MINI 20A | 4 | Fuel relay feed |
| Fuse MINI 10A | 5 | Rear Air Suspensión Module (RASM), VAPS module |
| Fuse MINI 15A | 6 | Alternator regulator |
| Fuse MINI 30A | 7 | PCM relay feed |
| Fuse MINI 20A | 8 | Driver’s Door Module (DDM), Door locks |
| Fuse MINI 15A | 9 | Ignition coil relay feed |
| Fuse MINI 20A | 10 | Horn relay feed |
| Fuse MINI 15A | 11 | A/C clutch relay feed |
| Fuse MINI 25A | 12 | Audio (non-Police vehicles only) Tray lamps (Police vehicles only) |
| Fuse MINI 20A | 13 | Instrument panel power point |
| Fuse MINI 20A | 14 | Stop lamp switch |
| Fuse MINI 20A | 15 | Heated seats |
| Fuse MINI 20A | 16 | Daytime Running Lamps (DRL) module |
| Fuse MINI 15A | 19 | Injectors |
| Fuse MINI 15A | 20 | PCM, Mass Air Flow (MAF) sensor |
| Fuse MINI 15A | 21 | Powertrain loads and sensors |
| Fuse MINI 5A | 24 | Radio mute |
| Fuse FMX/JCase 40A | 101 | Blower relay feed |
| Fuse FMX/JCase 50A | 102 | Cooling fan |
| Fuse FMX/JCase 50A | 103 | Instrument panel (I/P) fuse box feed #1, I/P fuses 23, 25, 27 and 31 |
| Fuse FMX/JCase 40A | 104 | Instrument panel (I/P) fuse box feed #2, I/P fuses 1, 3, 5, 7 and 9 |
| Fuse FMX/JCase 30A | 105 | Starter relay feed |
| Fuse FMX/JCase 40A | 106 | Anti-lock Brake System (ABS) module (Pump) |
| Fuse FMX/JCase 40A | 107 | Rear defroster relay feed |
| Fuse FMX/JCase 20A | 108 | Moonroof (non-Police vehicles only) Spotlights (available on Police vehicles, Long Wheel Base [LWB] vehicles and commercial vehicles only) |
| Fuse FMX/JCase 20A | 109 | ABS module (Valves) |
| Fuse FMX/JCase 30A | 110 | Wiper module |
| Fuse FMX/JCase 50A | 111 | Police PDB or Police I/P accessory battery feed (Police vehicles only) |
| Fuse FMX/JCase 30A | 112 | Air suspensión compressor (non-Police vehicles only) |
| Fuse FMX/JCase 40A | 112 | Police PDB relay feed (Police vehicles only) |
| Fuse FMX/JCase 50A | 113 | Police light bar or Police Trunk accessory battery feed (Police vehicles only) |
| Fuse FMX/JCase 50A | 114 | Police PDB or Police I/P accessory battery feed (Police vehicles only) |
| Fuse FMX/JCase 50A | 115 | Rear power point or Police trunk accessory battery feed (Police vehicles only) |
| Fuse FMX/JCase 50A | 116 | Police I/P accessory battery feed (Police vehicles only) |
| Fuse FMX/JCase 50A | 117 | Police PDB or Police I/P accessory battery feed (Police vehicles only) |
| Fuse FMX/JCase 50A | 118 | Rear power point or Police trunk accessory battery feed (Police vehicles only) |
| Relay | 201 | A/C clutch |
| Relay | 203 | Ignition coil |
| Relay | 204 | PCM |
| Relay | 206 | Fuel |
| Relay | 209 | Horn |
| Relay | 301 | Starter |
| Relay | 302 | Air compressor (non-Police vehicles only) RUN/ACC relay (Police vehicles only) |
| Relay | 303 | Blower |
| Relay | 304 | RUN/ACC relay (windows) (non-police vehicles only) RUN/ACC relay (windows and decklid) (police vehicles only) |
| Diode ATO | 501 | A/C clutch |
| Diode ATO | 502 | PCM |
| Diode ATO | 503 | Horn, Door latch |
| Circuit breaker MAXI | 601 | Power seats, Lumbar, Decklid |
| Circuit breaker MAXI | 602 | RUN/ACC relay (windows) (non-police vehicles only) RUN/ACC relay feed (windows and decklid) (police vehicles only) |
While the Power Distribution Box doesn’t directly house the OBD2 fuse, it’s important to understand its role in the overall electrical system of your 2005 Ford Crown Victoria. This box manages vital systems like the PCM, ABS, and cooling fan.
Conclusion:
When addressing OBD2 port issues in your 2005 Ford Crown Victoria, always start by checking Fuse #27 (20A MINI) in the Passenger Compartment Fuse Panel. This fuse powers the OBD2 port and is a common point of failure. Utilizing these fuse box diagrams and descriptions will empower you to effectively diagnose and fix electrical problems in your vehicle. Remember to always consult your vehicle’s owner’s manual for the most accurate and up-to-date information regarding your specific 2005 Ford Crown Victoria model.
