Mercury Mountaineer (2002 – 2005) Fuse Box Diagrams & Location
The Mercury Mountaineer (2002 – 2005) fuse box protects important electrical systems and accessories throughout the vehicle. This guide provides fuse box locations, fuse assignments, ratings, and diagrams to help identify the correct fuse for lighting, power windows, safety systems, and other components.
Fuse Box Location
Passenger Compartment Fuse Box
The fuse box is located under the instrument panel on the driver’s side.
Relay Location:l Top side these relays are located on the reverse side of the passenger compartment fuse panel. To access the relays you must remove the passenger compartment fuse panel.
Engine Compartment Fuse Box
The Power distribution box is located in the engine compartment (on the driver’s side), under the cover.
Rear Relay Box : The relay box is located on the rear passenger side quarter trim panel.
Fuse Box Diagrams
Passenger Compartment Fuse Box
| Fuse Location | Amp Rating | Description |
|---|---|---|
| 1 | 30A | 2002: Memory Seat Module. 2003–2004: Memory Seat Module, Driver Power Seat. 2005: Memory Seat Module, Driver Power Seat, Driver Power Lumbar. |
| 2 | 20A | 2002–2005: Moonroof. |
| 3 | 20A | 2002: Radio, Amplifier, Power Antenna. 2003–2005: Radio, Amplifier, DVD System. |
| 4 | 5A | 2002: Digital Transmission Range Sensor. 2003–2005: Front Wiper Module. |
| 5 | 15A | 2002–2005: Flasher Relay (Turn Signals, Hazard Lamps). |
| 6 | 10A | 2002–2003: Right Horn. 2004–2005: Key-In Chime. |
| 7 | 15A | 2002–2005: Heated Mirrors. |
| 8 | 5A | 2002: Washer Pump Relays (Front and Rear), Front Wiper Control. 2003: Not Used. 2004–2005: Heated PCV (4.0L Engine Only). |
| 9 | 15A | 2002: Rear Wiper Coil and Contact. 2003–2005: Not Used. |
| 10 | 10A | 2002–2005: Heated Backlight Relay Coil, A/C Clutch Contact. |
| 11 | 20A | 2002: Not Used. 2003–2005: Heated Seats. |
| 12 | 5A | 2002: Fog Lamp Switch, 4×4 Module. 2003–2005: Not Used. |
| 13 | 5A | 2002: Overdrive Cancel Switch, GEM Start, Flex Fuel Sender. 2003: Overdrive Cancel Switch, Flex Fuel Sender. 2004–2005: Overdrive Cancel Switch. |
| 14 | 5A | 2002–2005: PATS Module (Passive Anti-Theft System). |
| 15 | 5A | 2002: 4×4 System, Memory Seat Disable. 2003–2005: Rear Wiper Module, Instrument Cluster. |
| 16 | 5A | 2002: Power Mirror, Security Module (Turn), Manual Climate Control. 2003–2005: Power Mirror, Manual Climate Control, TPMS. |
| 17 | 15A | 2002: Delayed Accessory Coil, Battery Saver, Interior Lamps. 2003: Delayed Accessory Coil, Battery Saver, Glove Compartment Lamp, Second Row Courtesy Lamps, Front Interior Lamps. 2004–2005: Delayed Accessory Relay Coil, Battery Saver Coil and Contact, Reading Lamps, 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, Driver Seat Module, Body Security Module (BSM), Sunload Sensor. 2004–2005: Memory Driver Seat Switch, Driver Seat Module, BSM, PATS LED. |
| 21 | 5A | 2002–2005: Instrument Cluster, Compass, Flasher Coil. |
| 22 | 10A | 2002: Not Used. 2003: ABS. 2004–2005: ABS, IVD Controller. |
| 23 | 15A | 2002–2003: Brake Pedal Position Switch. 2004–2005: Not Used. |
| 24 | 15A | 2002–2005: Cigar Lighter, OBD II Diagnostic Connector. |
| 25 | 5A | 2002–2003: Mode and Temperature Actuator, Auxiliary Climate Control, Trailer Tow Battery Charge. 2004–2005: Mode-Temperature Actuator for Auxiliary Climate Control, Trailer Tow Battery Charge Relay Coil, TPMS. |
| 26 | 7.5A | 2002: Park Aid, Brake Shift Interlock, Approach Lamp Relay Coil. 2003: Park Aid, Brake Shift Interlock. 2004–2005: Reverse Park Aid, Brake Shift Interlock, IVD Switch. |
| 27 | 7.5A | 2002–2003: Electrochromatic Mirror, Digital Transmission Range Sensor, Backup Lamps. 2004–2005: Automatic Dimming Mirror, Digital Transmission Range Sensor, Backup Lamps. |
| 28 | 5A | 2002: Air Bag Diagnostics (10A). 2003: Radio Start/DVD Start. 2004–2005: Radio Start Circuit. |
| 29 | 10A | 2002: 4×4 System, GEM Module Signal, ABS Control Module, Moonroof. 2003–2005: Digital Transmission Range Sensor, Power Feed to Fuse #28 (Start Feed). |
| 30 | 5A | 2002: Daytime Running Lamps (DRL), Remote Solenoid, DEATC Climate Controller. 2003: DRL, Remote Solenoid, DEATC Climate Controller, Manual Climate Control. 2004–2005: DRL, DEATC Climate Controller, Manual Climate Control, Manual Climate Control Temperature Blend Actuator. |
Passenger Compartment Relay Box
| Relay Location | Description |
|---|---|
| Relay 1 | 2002–2005: Flasher Relay (Turn Signals and Hazard Lamps) |
| Relay 2 | 2002–2005: Rear Defrost Relay (Heated Backlight Relay) |
| Relay 3 | 2002–2005: Delayed Accessory Relay |
| Relay 4 | 2002: Front Washer Pump Relay. 2003–2005: Open (Not Used) |
| Relay 5 | 2002–2005: Battery Saver Relay |
| Relay 6 | 2002: Rear Washer Pump Relay. 2003–2005: Open (Not Used) |
| Relay 7 | 2002: Interior Lamps Relay. 2003–2005: Open (Not Used) |
Engine Compartment Fuse Box
Mercury Mountaineer (2002)
| Fuse/Relay Location | Fuse Amp Rating | Description |
|---|---|---|
| 1 | 60A** | Power Junction Box (PJB) |
| 2 | 20A** | Door Locks |
| 3 | 20A** | GCC Pusher Fan (Export Only) |
| 4 | 30A** | Rear Defrost |
| 5 | 40A** | Anti-lock Brake System (ABS) |
| 6 | 60A** | Delayed Accessory 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 | 10A* | Fog Lamps (Export Only) |
| 15 | 5A* | Memory |
| 16 | 15A* | 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** | Autolamp / Low Beam |
| 23 | 30A** | Ignition Switch |
| 24 | 10A* | Rear Fog Lamps (Export Only) |
| 25 | 20A* | Security Module (Horns) |
| 26 | 15A* | Fuel Pump |
| 27 | 20A* | Trailer Tow Lamps |
| 28 | 10A* | Daytime Running Lamps (DRL) |
| 29 | 60A** | Power Junction Box (PJB) |
| 30 | — | Not Used |
| 31 | — | Not Used |
| 32 | — | Not Used |
| 33 | 30A** | Auxiliary Blower Motor |
| 34 | 30A** | Power Seats |
| 35 | — | Not Used |
| 36 | 40A** | Blower Motor |
| 37 | 15A* | A/C Clutch |
| 38 | 15A* | Coil On Plug |
| 39 | 15A* | High Beam (7.5A LH High Beam – Export Only) |
| 40 | 15A* | PTEC Power |
| 41 | 15A* | HEGO, VMV, CMS, PTEC |
| 42 | 10A* | Right Low Beam |
| 43 | 10A* | Left Low Beam |
| 44 | 10A* | Front Fog Lamp |
| 45 | 7.5A* | Right High Beam (Export Only) |
| 46 | 15A* | Injectors |
| 47 | — | Daytime Running Lamp Relay (Canada) / GCC Pusher Fan Relay (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 Only) |
| 54 | — | Wiper Run / 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 Circuit Breaker |
Mercury Mountaineer (2003-2005)
| Location | Fuse Amp Rating | Description |
|---|---|---|
| 1 | 60A Cartridge Fuse | PJB #1 (2003–2005) |
| 2 | 30A Cartridge Fuse | Battery Saver Module (BSM) (2003–2005) |
| 3 | — | Not Used (2003–2005) |
| 4 | 30A Cartridge Fuse | Rear Defrost (2003–2005) |
| 5 | 40A Cartridge Fuse | Anti-lock Brake System (ABS) Pump (2003–2005) |
| 6 | 60A Cartridge Fuse | Delayed Accessory (2003); Delayed Accessory, Power Windows, Audio (2004–2005) |
| 7 | 20A Cartridge Fuse | Power Point #2 (2003–2005) |
| 8 | — | Not Used (2003–2005) |
| 9 | 20A Cartridge Fuse | Power Point #1 (2003–2005) |
| 10 | 30A Cartridge Fuse | ABS Module Valves (2003–2005) |
| 11 | 40A Cartridge Fuse | PTEC (2003); Powertrain Control Module (PCM) (2004–2005) |
| 12 | 50A Cartridge Fuse | Ignition Relay, Starter Relay (2003–2005) |
| 13 | 40A Cartridge Fuse | Trailer Tow Battery, Trailer Tow Turn Signals (2003); Trailer Tow Battery Charge, Trailer Tow Turn Signals (2004–2005) |
| 14 | — | Daytime Running Lamps (DRL) Canada (2003); Not Used (2004–2005) |
| 15 | 15A Mini Fuse | Memory (PCM/DEATC/Cluster), Interior Lights (2003); Memory (PCM/DEATC/Cluster), Courtesy Lamps (2004–2005) |
| 16 | 15A Mini Fuse | Headlamp Switch, Foglamp Switch (2003); Park Lamps, Autolamp Parklamps, Front Foglamp Relay Coil (2004–2005) |
| 17 | — | Not Used (2003–2005) |
| 18 | 20A Mini Fuse | Not Used (2003); PCM with Two-Speed 4×4 Clutch (2004–2005) |
| 19 | 20A Cartridge Fuse | High Beam Relay (2003–2005) |
| 20 | 30A Cartridge Fuse | Electric Brake (2003); Trailer Electric Brake Module (2004–2005) |
| 21 | 30A Cartridge Fuse | Front Wiper Motor (2003–2005) |
| 22 | 20A Cartridge Fuse | Low Beam (2003); Low Beam, Autolamp (2004–2005) |
| 23 | 30A Cartridge Fuse | Ignition Switch (2003); Ignition Switch, PCM Diode (2004–2005) |
| 24 | — | Not Used (2003–2005) |
| 25 | 15A Mini Fuse | Not Used (2003); Brake On-Off Switch (2004–2005) |
| 26 | 20A Mini Fuse | Fuel Pump (2003–2005) |
| 27 | 20A Mini Fuse | Trailer Tow Lamps (2003); Trailer Tow Park Lamps, Trailer Tow Backup Lamps (2004–2005) |
| 28 | 20A Mini Fuse | Horn Relay (2003–2005) |
| 29 | 60A Cartridge Fuse | PJB (2003); PJB #2 (2004–2005) |
| 30 | 20A Cartridge Fuse | Rear Wiper Motor (2003–2005) |
| 31 | — | Not Used (2003–2005) |
| 32 | — | Not Used (2003–2005) |
| 33 | 30A Cartridge Fuse | Auxiliary Blower Motor (2003–2005) |
| 34 | 30A Cartridge Fuse | Passenger Power Seat, Adjustable Pedals (2003); Passenger Power Seat, Adjustable Pedals (Non-Memory) (2004–2005) |
| 35 | — | Not Used (2003–2005) |
| 36 | 40A Cartridge Fuse | Blower Motor (2003–2005) |
| 37 | 15A Mini Fuse | A/C Clutch Relay, Transmission (2003–2005) |
| 38 | 15A Mini Fuse | Coil on Plug (2003); HEGO, VMV, CMS, ESM, CVS (2004–2005) |
| 39 | 15A Mini Fuse | Injectors, Fuel Pump Relay (2003); Injectors, Fuel Pump Relay Coil (2004–2005) |
| 40 | 15A Mini Fuse | PTEC Power (2003); PCM Power (2004–2005) |
| 41 | 15A Mini Fuse | HEGO, VMV, CMS, PTEC (2003); Coil on Plug (4.6L Engine), Ignition Coil (4.0L Engine) (2004–2005) |
| 42 | 10A Mini Fuse | Right Low Beam (2003–2005) |
| 43 | 10A Mini Fuse | Left Low Beam (2003–2005) |
| 44 | 15A Mini Fuse | Front Fog Lamps (2003–2005) |
| 45 | 2A Mini Fuse | Brake Pressure Switch (ABS) (2003); Brake Pressure Switch (Non-AdvanceTrac Vehicles) (2004–2005) |
| 46 | 20A Mini Fuse | High Beams (2003–2005) |
| 47 | — | Horn Relay (2003–2005) |
| 48 | — | Fuel Pump Relay (2003–2005) |
| 49 | — | High Beam Relay (2003–2005) |
| 50 | — | Front Fog Lamps Relay (2003–2005) |
| 51 | — | DRL Relay Canada (2003); Not Used (2004–2005) |
| 52 | — | A/C Clutch Relay (2003–2005) |
| 53 | — | Trailer Tow Right Turn Relay (2003–2005) |
| 54 | — | Trailer Tow Left Turn Relay (2003–2005) |
| 55 | — | Blower Motor Relay (2003–2005) |
| 56 | — | Starter Relay (2003–2005) |
| 57 | — | PTEC Relay (2003); PCM Relay (2004–2005) |
| 58 | — | Ignition Relay (2003–2005) |
| 59 | — | Not Used (2003–2005) |
| 60 | — | PCM Diode (2003–2005) |
| 61 | — | A/C Clutch Diode (2003–2005) |
| 62 | 30A Circuit Breaker | Power Windows Circuit Breaker (2003–2005) |
Rear Relay Box (2002- 2005)
| 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 |
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