Understanding your 2005 Mercury Mountaineer’s electrical system is crucial for maintenance and troubleshooting. Whether you’re dealing with a blown fuse or need to connect a scan tool for diagnostics using the OBD2 port, knowing the locations of these components is essential. This guide provides detailed information on the fuse box locations and diagrams for the 2002-2005 Mercury Mountaineer models, and importantly, pinpoints the 2005 Mercury Mountaineer Obd2 Location to help you easily access your vehicle’s diagnostic system.
Passenger Compartment Fuse Box
Fuse Box Location
The primary fuse box inside your Mercury Mountaineer is located for easy access. You can find it under the instrument panel on the driver’s side.
Fuse Box Diagram
This diagram details the fuses within the passenger compartment fuse box for the Mercury Mountaineer models from 2002 to 2005.
| № | Amp | Description |
|---|---|---|
| 1 | 30A | 2002: Radio Sense, 4×4, ABS Control Module 2003-2005: Memory seat module, Driver power seat, Driver power lumbar |
| 2 | 20A | 2002: Folding Mirror, Moon Roof, Heated Seats, Moon roof 2003-2005: Heated seats (2003), Moonroof |
| 3 | 20A | Radio, Amplifier, DVT, Power Antenna (2002) |
| 4 | 5A | 2002: Digital Transmission Range Sensor 2003-2005: Front wiper module |
| 5 | 15A | Flasher relay (Turn, hazards) |
| 6 | 10A | 2002-2003: Right horn 2004-2005: Key-in-chime |
| 7 | 15A | Heated mirrors |
| 8 | 5A | 2002: Washer Pump Relays (Front and Rear), Front Wiper Control 2003-2005: Heated PCV (4.0L engine only) |
| 9 | 15A | 2002: Rear Wiper Coil and Contact 2003-2005: Not used |
| 10 | 10A | 2002-2003: Heated backlight relay coil, Heated seat module, A/C clutch contact, Temp Blend Actuator (2002) 2004-2005: Heated backlight relay coil, A/C clutch contact |
| 11 | 20A | 2002-2003: Not used (spare) 2004-2005: Heated seats |
| 12 | 5A | 2002: Foglamp Switch,4×4 module 2003: 4×4 module 2004-2005: Not used |
| 13 | 5A | 2002: Over Drive Cancel Switch, GEM Start, Flex Fuel Sender 2003-2005: Overdrive cancel switch |
| 14 | 5A | PATS |
| 15 | 5A | 2002: 4 x 4, Memory Seat Disable 2003-2005: Rear wiper module, Cluster, TPMS (2003) |
| 16 | 5A | 2002: Power Mirror, Security Module (turn), Manual Climate Control 2003-2005: Power mirror, Manual climate control, TPMS |
| 17 | 15A | Delayed accessory relay coil/Battery saver coil and contact/Reading and glove box lamps |
| 18 | 10A | 2002-2003: Left horn 2004-2005: Flexible fuel pump |
| 19 | 10A | 2002: Not Used 2003-2005: Restraint Control Module (RCM) |
| 20 | 5A | 2002: Memory Module, GEM Module 2003: Driver seat switch, Memory switch, Driver seat module, BSM, Sunload sensor 2004-2005: Memory driver seat switch, Driver seat module, Body Security Module (BSM), PATS LED |
| 21 | 5A | Instrument cluster, Compass, Flasher coil |
| 22 | 10A | 2002: Not Used 2003-2005: ABS, IVD Controller |
| 23 | 15A | 2002: Brake Pedal Position Switch 2003: Brake pedal position switch, Driver brake applied relay, Redundant cruise deactivate switch 2004-2005: Not used |
| 24 | 15A | Cigar lighter, OBD II |
| 25 | 5A | Mode-Temperature actuator for auxiliary climate control, Trailer tow battery charge relay coil, TPMS (2004-2005) |
| 26 | 7.5A | Reverse park aid, Brake shift interlock, Approach lamp relay coil (2003) IVD switch |
| 27 | 7.5A | 2002: Electronic Compass Mirror, Security Module, Digital Transmission Range Sensor – Backup Lamps 2003-2005: Automatic dimming mirror, Digital transmission range sensor, Backup lamps |
| 28 | 5A | 2002: Air Bag Diagnostics 2003-2005: Radio (Start)/DVD (Start) |
| 29 | 5A/10A | 2002: 4 x 4, GEM Module signal, ABS Control Module, Moon Roof 2003-2005: Digital transmission range sensor, PWR feed to fuse #28 (Start feed) |
| 30 | 5A | Daytime Running Lamps (DRL), DEATC climate controller, Manual climate control, Manual climate control temp blend actuator |
Notably, fuse #24 in this panel is designated for “Cigar lighter, OBD II“, which is a helpful hint but not the physical 2005 mercury mountaineer OBD2 location itself. We will pinpoint that specifically in a later section.
Passenger Compartment Relay Location
These relays are situated on the top side of the passenger compartment fuse panel. Accessing them requires removal of the fuse panel.
| № | Relays |
|---|---|
| 1 | Flasher |
| 2 | Rear defrost |
| 3 | Delayed accessory |
| 4 | Front Washer Pump (2002) |
| 5 | Battery saver |
| 6 | Rear Washer Pump (2002) |
| 7 | Interior Lamps (2002) |
Engine Compartment Fuse Box
Fuse Box Location
The power distribution box, or engine compartment fuse box, is located under the hood on the driver’s side. It’s protected by a cover.
Fuse Box Diagram (2002)
This diagram specifically applies to the 2002 Mercury Mountaineer model year.
| № | Amp Rating | Description |
|---|---|---|
| 1 | 60A** | PJB |
| 2 | 20A** | Door Locks |
| 3 | 20A** | GCC Pusher Fan (export only) |
| 4 | 30A** | Heated Backlight |
| 5 | 40A** | ABS |
| 6 | 60A** | Circuit Breaker |
| 7 | 20A** | Power Point #2 |
| 8 | — | Not Used |
| 9 | 20A** | Power Point #1 |
| 10 | 20A** | ABS Module |
| 11 | 40A** | PTEC |
| 12 | 50A** | Ignition Relay |
| 13 | 30A** | Trailer Tow Battery |
| 14 | 10 A* | Fog Lamps |
| 15 | 5A* | Memory |
| 16 | 15 A* | Headlamp Switch |
| 17 | 20A* | 4×4 (v-batt 2) |
| 18 | 20A* | 4×4 (v-batt 1) |
| 19 | 20A** | High Beam Relay |
| 20 | 30A** | Electric Brake |
| 21 | Not Used | |
| 22 | 20A** | Autolmap; Low Beam |
| 23 | 30A** | Ignition Switch |
| 24 | 10 A* | Rear Fog Lamps |
| 25 | 20A* | Security Module (horns) |
| 26 | 15A* | Fuel Pump |
| 27 | 20A* | Trailer Tow Lamps |
| 28 | 10 A* | Daytime Running Lamps (DRL) |
| 29 | 60A** | PJB |
| 30 | — | Not Used |
| 31 | Not Used | |
| 32 | Not Used | |
| 33 | 30A** | Auxiliary Blow er Motor |
| 34 | 30A** | Power Seats |
| 35 | — | Not Used |
| 36 | 40A** | Blower Motor |
| 37 | 15A* | A/C Clutch |
| 38 | 15 A* | Coil On Plug |
| 39 | 15 A* | High Beam |
| 40 | 15 A* | PTEC Power |
| 41 | 15 A* | HEGO, UMV, CMS, PTEC |
| 42 | 10 A* | Right Low Beam |
| 43 | 10 A* | Left Low Beam |
| 44 | 10 A* | High Beam Relay |
| 45 | 7.5A* | Right High Beam (export only) |
| 46 | 15 A* | Injectors |
| 47 | — | Daytime Running Lamps Relay, GCC Pusher Fan (export) |
| 48 | — | Fuel Pump Relay |
| 49 | — | High Beam Relay |
| 50 | — | Fog Lamp Relay |
| 51 | — | Autolamp Relay |
| 52 | — | A/C Clutch Relay |
| 53 | — | Park Lamp Relay (export) |
| 54 | — | Wiper Rim / Park Relay |
| 55 | — | Blower Motor Relay |
| 56 | — | Starter Relay |
| 57 | — | PTEC Relay |
| 58 | — | Ignition Relay |
| 59 | — | Wiper High/Low Relay |
| 60 | — | PCM Diode |
| 61 | — | A/C Clutch Diode |
| 67 | 30A CB | Delayed accessory |
| * Mini Fuses ** Maxi Cartridge Fuses |
Fuse Box Diagram (2003-2005)
For 2003, 2004, and 2005 Mercury Mountaineer models, the engine compartment fuse box layout is as follows:
| № | Amp | Description |
|---|---|---|
| 1 | 60A** | PJB #1 |
| 2 | 30A** | BSM |
| 3 | — | Not used |
| 4 | 30A** | Rear defrost |
| 5 | 40A** | Anti-lock Brake System (ABS) pump |
| 6 | 60A** | Delayed accessory, Power windows, Audio |
| 7 | 20A** | Power point #2 |
| 8 | — | Not used |
| 9 | 20A** | Power point #1 |
| 10 | 30A** | ABS module (valves) |
| 11 | 40A** | Powertrain Control Module (PCM) |
| 12 | 50 A** | Ignition relay, Starter relay |
| 13 | 40A** | Trailer tow battery charge, Trailer tow turn signals |
| 14 | 10A* | 2003-2004: Daytime Running Lamps (DRL) (Canada) 2005: Not used |
| 15 | 15A* | Memory (PCM/DEATC/Cluster), Courtesy lamps |
| 16 | 15A* | Park lamps, Autolamp parklamps, Front foglamps relay coil |
| 17 | 20 | 2003: 4×4 (v-batt 2) 2004-2005: Not used |
| 18 | 20A* | 2004: 4×4 (v-batt 1) 2004-2005: PCM with two-speed 4×4 clutch |
| 19 | 20A** | High beam relay |
| 20 | 30A** | Trailer electric brake module |
| 21 | 30A** | Front wiper motor |
| 22 | 20A** | Low beam, Autolamp |
| 23 | 30A** | Ignition switch, PCM diode |
| 24 | — | Not used |
| 25 | 15A* | 2003: Not Used 2004-2005: Brake on-off |
| 26 | 20A* | Fuel pump |
| 27 | 20A* | Trailer tow- park lamps, Trailer tow- back-up |
| 28 | 20A* | Horn relay |
| 29 | 60A** | PJB #2 |
| 30 | 20A** | Rear wiper motor |
| 31 | — | Not used |
| 32 | — | Not used |
| 33 | 30A** | Auxiliary blower motor |
| 34 | 30A** | Passenger power seat, Adjustable pedals (non-memory) |
| 35 | — | Not used |
| 36 | 40A** | Blower motor |
| 37 | 15A* | A/C clutch relay, Transmission |
| 38 | 15A* | 2003: Coil on plug 2004-2005: HEGO, VMV, CMS, ESM, CVS |
| 39 | 15A* | Injectors, Fuel pump relay coil |
| 40 | 15A* | 2003: PTEC power 2004-2005: PCM power |
| 41 | 15A* | 2003-2004: HEGO, VMV, CMS, PCM diode, ESM, CVS 2005: Coil on plug (4.6L engine only), Ignition coil (4.0L engine only) |
| 42 | 10 A* | Right low beam |
| 43 | 10 A* | Left low- beam |
| 44 | 15A* | Front foglamps |
| 45 | 2A* | 2003: Brake pressure switch (ABS) 2004-2005: Brake pressure switch (non-AdvanceTrac vehicles) |
| 46 | 20A* | High beams |
| 47 | — | Horn relay |
| 48 | — | Fuel pump relay |
| 49 | — | High beam relay |
| 50 | — | Front fog lamps relay |
| 51 | — | 2003: DRL relay (Canada)/AdvanceTrac relay (U.S.) 2004-2005: DRL relay (Canada) |
| 52 | — | A/C clutch relay |
| 53 | — | Trailer tow right turn relay |
| 54 | — | Trailer tow left turn relay |
| 55 | — | Blower motor relay |
| 56 | — | Starter relay |
| 57 | — | 2003: PTEC relay 2004-2005: PCM relay |
| 58 | — | Ignition relay |
| 59 | — | 2003: Driver brake applied relay (vehicles equipped with AdvanceTrac only) 2004-2005: Not used |
| 60 | — | PCM diode |
| 61 | — | A/C clutch diode |
| 62 | 30A CB | Power windows circuit breaker |
| * Mini Fuses ** Cartridge Fuses |
Rear Relay Box
Relay Box Location
For additional relays, you’ll find a relay box located on the rear passenger side quarter trim panel within the vehicle.
| Relay Location | Description |
|---|---|
| 14 | 2002: Rear fog lamps (export) 2003-2005: Not used |
| 15 | Trailer Tow back up lamps |
| 16 | Not Used |
| 17 | 2002-2003: Rear Wipers 2004-2005: Not Used |
| 18 | 2002: Trailer Tow Stop EAO 2003-2005: Not Used |
| 19 | Trailer Tow Park Lamps |
| 20 | Trailer Tow Battery Charge |
| 21 | Not Used |
| 22 | 2002-2003: Approach Lamps 2004-2005: Not Used |
| 23 | Not Used |
| Diode 3 | Not Used |
| Diode 4 | Not Used |
2005 Mercury Mountaineer OBD2 Location
Now, to directly answer the query about the 2005 mercury mountaineer obd2 location: You can find the OBD2 port of your 2005 Mercury Mountaineer located under the driver’s side dashboard. Typically, it is near the steering column, and you may need to look slightly underneath the dash to locate it. It’s designed for easy access so you can connect a scan tool to diagnose any trouble codes or check the overall health of your vehicle’s systems.
Knowing the 2005 mercury mountaineer OBD2 location is the first step in performing your own diagnostic checks, saving time and potentially money on mechanic visits for simple issues. Paired with the fuse box diagrams, you are now better equipped to maintain and troubleshoot your 2005 Mercury Mountaineer.
Further Resources for Vehicle Maintenance:
- How to check the fuses?
- How to replace a blown fuse?
- Why do car fuses blow?
- Types of automotive fuses
