Mercury Mountaineer 2004 Fuse Box Info
Passenger compartment fuse box location:
The fuse box is located below the instrument panel on the driver’s side.
Engine compartment fuse box location:
Fuse Box Diagram | Layout
Passenger compartment fuse box:
| Fuse/Relay N° | Rating | Functions |
| 1 | 30A | Memory seat module, Driver power seat |
| 2 | 20A | Moonroof |
| 3 | 20A | Radio, Amplifier, DVD |
| 4 | 5A | Front wiper module |
| 5 | 15A | Flasher Relay (Turn, Hazards) |
| 6 | 10A | Key-in-chime |
| 7 | 15A | Heated Mirrors |
| 8 | 5A | Heated PCV (4.0L engine only) |
| 9 | 15A | Not used |
| 10 | 10A | Heated backlight relay coil, A/C clutch contact |
| 11 | 20A | Heated seats |
| 12 | 5A | Not used |
| 13 | 5A | Overdrive cancel switch |
| 14 | 5A | PATS |
| 15 | 5A | Rear wiper module, Cluster |
| 16 | 5A | Power mirror, Manual climate control, TPMS |
| 17 | 15A | Delayed accessory relay coil/Battery saver coil and contact/Reading and glove box lamps |
| 18 | 10A | Flexible fuel pump |
| 19 | 10A | Restraint Control Module (RCM) |
| 20 | 5A | Memory driver seat switch, Driver seat module, Body Security Module (BSM), PATS LED |
| 21 | 5A | Instrument cluster, Compass, Flasher coil |
| 22 | 10A | ABS, IVD Controller |
| 23 | 15A | Not used |
| 24 | 15A | Cigar lighter, OBD II |
| 25 | 5A | Mode-Temperature actuator for auxiliary climate control, Trailer tow battery charge relay coil, TPMS |
| 26 | 7.5A | Reverse park aid, Brake shift interlock, IVD switch |
| 27 | 7.5A | Automatic dimming mirror, Digital transmission range sensor, Backup lamps |
| 28 | 5A | Radio (Start) |
| 29 | 10A | 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 |
Passenger compartment fuse box - top side (These relays are located on the reverse side of the passenger compartment fuse panel):
| Fuse/Relay N° | Rating | Functions |
| Relay 1 | - | Flasher Relay |
| Relay 2 | - | Rear Defrost |
| Relay 3 | - | Delayed Accessory |
| Relay 4 | - | Open |
| Relay 5 | - | Battery Saver |
| Relay 6 | - | Open |
| Relay 7 | - | Open |
Engine compartment fuse box:
| Fuse/Relay N° | Rating | Functions |
| 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 | 50A | Ignition relay, Starter relay |
| 13 | 40A | Trailer tow battery charge, Trailer tow turn signals |
| 14 | 10A | Daytime Running Lamps (DRL) (Canada) |
| 15 | 15A | Memory (PCM/DEATC/Cluster), Courtesy lamps |
| 16 | 15A | Park lamps, Autolamp parklamps, Front foglamps relay coil |
| 17 | - | Not used |
| 18 | 20A | PCM with One-speed Torque-On-Demand (TOD) or Two-speed 4x4 |
| 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 |
| 24 | - | Not used |
| 25 | 15A | Brake on-off |
| 26 | 15A | 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 | Coil on plug (4.6L engine only), Ignition coil (4.0L engine only) |
| 39 | 15A | Injectors, Fuel pump relay coil |
| 40 | 15A | PCM power |
| 41 | 15A | HEGO, VMV, CMS, PCM diode, ESM, CVS |
| 42 | 10A | Right Low Beam |
| 43 | 10A | Left Low Beam |
| 44 | 15A | Front foglamps |
| 45 | 2A | Brake pressure switch (non-AdvanceTrac vehicles) |
| 46 | 20A | High beams |
| 47 | - | Horn relay |
| 48 | - | Fuel Pump Relay |
| 49 | - | High Beam Relay |
| 50 | - | Front foglamps relay |
| 51 | - | 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 | - | PCM relay |
| 58 | - | Ignition Relay |
| 59 | - | AdvanceTrac stop lamp relay |
| 60 | - | PCM Diode |
| 61 | - | A/C Clutch Diode |
| 62 | 30A | Power windows circuit breaker |
Rear Relay Box (The relay box is located on the rear passenger side quarter trim panel):
| Fuse/Relay N° | Rating | Functions |
| Relay 14 | - | Not used |
| Relay 15 | - | Trailer Tow back up lamps |
| Relay 16 | - | Not Used |
| Relay 17 | - | Not used |
| Relay 18 | - | Not used |
| Relay 19 | - | Trailer Tow Park Lamps |
| Relay 20 | - | Trailer Tow Battery Charge |
| Relay 21 | - | Not Used |
| Relay 22 | - | Not Used |
| Relay 23 | - | Not Used |
| Diode 3 | - | Not Used |
| Diode 4 | - | Not Used |
