Understanding the fuse box in your 2005 Lincoln Town Car is crucial for maintaining its electrical system and diagnosing issues. A common point of interest for car owners and DIY mechanics is the OBD2 fuse. This fuse is essential for powering the On-Board Diagnostics II (OBD2) port, which is used for vehicle diagnostics and emission testing. If you’re experiencing issues connecting your scan tool or suspect a problem with your OBD2 port, a blown fuse might be the culprit.
The 2005 Lincoln Town Car utilizes two distinct fuse boxes. Knowing their locations and the specific fuses they house is key to troubleshooting electrical problems, including those related to your OBD2 system. Let’s explore these fuse boxes and pinpoint the OBD2 fuse location.
Passenger Compartment Fuse Panel
The primary fuse box you’ll need to check for OBD2 related issues is the Passenger Compartment Fuse Panel. This fuse box is typically located inside the vehicle, making it easily accessible.
Passenger Compartment Fuse Panel Diagram for 2005 Lincoln Town Car
Referring to the diagram and the table below, you’ll find the fuse related to the OBD II system.
| Type | No. | Description |
|---|---|---|
| Fuse MINI 10A | 1 | Starter relay coil |
| Fuse MINI 10A | 2 | Restraint Control Module (RCM), Occupant Classification Sensor (OCS), Passenger Air bag Deactivation Indicator (PADI) |
| Fuse MINI 10A | 3 | Audio, Navigation control head |
| Fuse MINI 10A | 4 | Back-up lamps |
| Fuse MINI 10A | 5 | Audio |
| Fuse MINI 10A | 6 | Passive Anti-Theft System (PATS), Powertrain Control Module (PCM) relay coil, Ignition coil relay coil, Fuel relay coil |
| Fuse MINI 10A | 7 | Wiper module |
| Fuse MINI 10A | 8 | Power Decklid Module (PDM), Lighting Control Module (LCM), Overdrive cancel switch, Cluster, Rear defroster relay coil |
| Fuse MINI 7.5A | 9 | Mirror switch illumination, Door lock switch illumination, Rear audio control, Heated seat switch illumination, LCM, Electrochromatic mirror, Overhead console |
| Fuse MINI 15A | 10 | Hazards |
| Fuse MINI 10A | 11 | Rear Air Suspensión Module (RASM) |
| Fuse MINI 10A | 12 | LCM (Illumination) |
| Fuse MINI 10A | 13 | Cluster, Extended rear park aide module |
| Fuse MINI 15A | 14 | Adjustable pedals |
| Fuse MINI 10A | 15 | Dual Automatic Temperature Control (DATC) module |
| Fuse MINI 20A | 16 | Cigar lighter, OBD II |
| Fuse MINI 10A | 17 | Anti-lock Brake System (ABS) module, Positive Crankcase Ventilation (PCV) |
| Fuse MINI 15A | 18 | LCM (Interior lighting) |
| Fuse MINI 10A | 19 | Driver’s Door Module (DDM) switches, PDM, Power mirrors, DSM |
| Fuse MINI 10A | 20 | LCM (Right-hand low beam) |
| Fuse MINI 10A | 21 | PATS LED, Cluster, Analog clock, Overhead console |
| Fuse MINI 10A | 22 | LCM (Left-hand low beam) |
| Fuse MINI 10A | 23 | LCM |
| Fuse MINI 15A | 24 | LCM (High beams), Multi-function switch (Flash-to-pass) |
| Fuse MINI 10A | 25 | Brake-Transmission Shift Interlock (BTSI), Stop switch signal feed, Speed control deactivation switch |
| Fuse MINI 15A | 26 | LCM (Park lamps, cornering lamps) |
| Fuse MINI 10A | 27 | DATC module |
| Fuse MINI 10A | 28 | Center High-Mounted Stop Lamp (CHMSL) |
| Fuse MINI 15A | 29 | Turn signals |
| Fuse MINI 15A | 30 | Stop lamps |
| Fuse MINI 10A | 31 | A/C cycle switch, Heated seats module |
| Fuse MINI 10A | 32 | Mirror heaters |
| Fuse MINI 15A | 33 | Audio, Navigation |
| Relay | K101 | Rear defroster relay |
Fuse number 16, a 20A Mini fuse, is designated for both the Cigar lighter and the OBD II port. This means if your OBD2 port is not working, or your cigarette lighter outlet is also non-functional, this fuse is the first place to check.
Power Distribution Box
The 2005 Lincoln Town Car also has a Power Distribution Box, which is typically located under the hood in the engine compartment. While less likely to be directly related to the OBD2 port itself, understanding this box is also important for overall vehicle electrical system knowledge.
Power Distribution Box Diagram for 2005 Lincoln Town Car
Below is the fuse and relay listing for 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 20A | 5 | Instrument panel power point |
| Fuse MINI 15A | 6 | Alternator regulator |
| Fuse MINI 30A | 7 | PCM relay feed |
| Fuse MINI 20A | 8 | Driver’s Door Module (DDM) |
| 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 20A | 12 | Audio |
| Fuse MINI 20A | 13 | Instrument panel fuse box feed #3 |
| Fuse MINI 20A | 14 | Stop lamp switch |
| Fuse MINI 15A | 15 | Lumbar, Fuel door |
| Fuse MINI 20A | 16 | Heated seats |
| 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 10A | 22 | Rear Air Suspensión Module (RASM) |
| Fuse MINI 10A | 23 | Delayed accessory (Moonroof, audio and navigation system) |
| Fuse FMX/JCase 40A | 101 | Blower relay feed |
| Fuse FMX/JCase 50A | 102 | Cooling fan |
| Fuse FMX/JCase 50A | 103 | Instrument panel fuse box feed #1 |
| Fuse FMX/JCase 40A | 104 | Instrument panel fuse box feed #2 |
| Fuse FMX/JCase 30A | 105 | Starter relay feed |
| Fuse FMX/JCase 40A | 106 | ABS module (Pump) |
| Fuse FMX/JCase 40A | 107 | Rear defroster relay feed |
| Fuse FMX/JCase 40A | 108 | Power Decklid Module (PDM) |
| Fuse FMX/JCase 20A | 109 | ABS module (Valves) |
| Fuse FMX/JCase 30A | 110 | Wiper module |
| Fuse FMX/JCase 20A | 111 | Rear power point #1 |
| Fuse FMX/JCase 30A | 112 | RASM (Air compressor) |
| Fuse FMX/JCase 20A | 113 | Rear power point #2 |
| Fuse FMX/JCase 20A | 114 | Moonroof |
| Fuse FMX/JCase 20A | 115 | Rear cigar lighters |
| Fuse FMX/JCase 30A | 116 | Pulldown module |
| Fuse FMX/JCase 30A | 117 | Driver seat module |
| Fuse FMX/JCase 20A | 118 | Rear heated seats |
| Relay | 201 | A/C clutch |
| Relay | 203 | Ignition coil |
| Relay | 204 | PCM |
| Relay | 206 | Fuel |
| Relay | 209 | Horn |
| Relay | 301 | Starter |
| Relay | 302 | RASM (Air compressor) |
| Relay | 303 | Blower |
| Relay | 304 | Delayed accessory |
| Diode ATO | 501 | A/C clutch |
| Diode ATO | 502 | Reverse battery |
| Diode ATO | 503 | Horn, Door latch |
| Circuit breaker MAXI | 601 | Power seats |
| Circuit breaker MAXI | 602 | Delayed accessory relay for windows, moonroof, audio and navigation system |
While the Power Distribution Box doesn’t house a dedicated “OBD2 fuse”, it controls vital systems. Issues in this box could indirectly affect vehicle diagnostics. However, for direct OBD2 port fuse troubleshooting on your 2005 Lincoln Town Car, focus primarily on the Passenger Compartment Fuse Panel and Fuse #16 (20A).
If you are experiencing problems with your OBD2 port, always check this fuse first. Replacing a blown fuse is a simple fix that can save you time and money on diagnostics. If the fuse continues to blow, it indicates a potential short circuit or overload in the cigar lighter or OBD2 system that requires further investigation by a qualified mechanic.
