Mercury Mountaineer Second Generation (2002 -2005) – fuse box diagram
Year of production: 2002, 2003, 2004, 2005
Passenger compartment fuse panel
The fuse panel is located below the instrument panel on the driver’s side.
| Fuse | Ampere rating [A] | Description |
| 1 | 30 | Radio Sense, 4×4, ABS Control Module |
| 2 | 20 | Folding Mirror, Moon Roof, Heated Seats, Moon roof |
| 3 | 20 | Radio, Amplifier, Power Antenna |
| 4 | 5 | Digital Transmission Range Sensor |
| 5 | 15 | Flasher Relay (Turn, Hazards) |
| 6 | 10 | Right Horn |
| 7 | 15 | Heated Mirrors |
| 8 | 30 | Washer Pump Relays (Front and Rear), Front Wiper Control |
| 9 | 15 | Rear Wiper Coil and Contact |
| 10 | 10 | Heated Backlight Relay Coil, Heated Seat Module, Temp Blend Actuator, A/C Clutch Contact |
| 11 | — | Not used |
| 12 | 5 | Foglamp Switch,4×4 module |
| 13 | 5 | Over Drive Cancel Switch, GEM Start, Flex Fuel Sender |
| 14 | 5 | PATS Module |
| 15 | 5 | 4 x 4, Memory Seat Disable |
| 16 | 5 | Power Mirror, Security Module (turn), Manual Climate Control |
| 17 | 15 | Delayed Acc. Coil, Battery Saver, Interior Lamps |
| 18 | 10 | Left Horn |
| 19 | — | Not used |
| 20 | 5 | Memory Module, GEM Module |
| 21 | 5 | Instrument Cluster, Compass, Flasher Coil |
| 22 | — | Not used |
| 23 | 15 | Brake Pedal Position Switch |
| 24 | 15 | Cigar Lighter, OBD II |
| 25 | 5 | Mode, Temperature Actuator, Auxiliary Climate Control, Trailer Tow Battery Charge, Moon Roof |
| 26 | 7,5 | Park Aid, Brake Shift Interlock, Approach Lamp Relay Coil |
| 27 | 7,5 | Electronic Compass Mirror, Security Module, Digital Transmission Range Sensor – Backup Lamps |
| 28 | 10 | Air Bag Diagnostics |
| 29 | 5 | 4 x 4, GEM Module signal, ABS Control Module, Moon Roof |
| 30 | 5 | Daytime Running Lamps (DRL), Remote Solenoid, DEATC Climate Controller |
Passenger compartment fuse panel (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.
| Relay | Description |
| Relay 1 | Flasher Relay |
| Relay 2 | Rear Defrost |
| Relay 3 | Delayed Accessory Relay |
| Relay 4 | Front Washer Pump |
| Relay 5 | Battery Saver |
| Relay 6 | Rear Washer Pump |
| Relay 7 | Interior Lamps |
Power distribution box
The power distribution box is located in the engine compartment. The power distribution box contains high-current fuses that protect your vehicle’s main electrical systems from overload
| Fuse/relay | Ampere rating [A] | Description |
| 1 | 60** | PJB |
| 2 | 20** | Door locks |
| 3 | 20** | GCC Pusher Fan (export only) |
| 4 | 30** | Heated Backlight |
| 5 | 40** | ABS |
| 6 | 60** | Circuit Breaker |
| 7 | 20** | Power Point #2 |
| 8 | — | Not used |
| 9 | 20** | Power Point #1 |
| 10 | 20** | ABS Module |
| 11 | 40** | PTEC |
| 12 | 50** | Ignition Relay |
| 13 | 30** | Trailer Tow Battery |
| 14 | 10* | Fog Lamps |
| 15 | 5* | Memory |
| 16 | 15* | Headlamp Switch |
| 17 | 20* | 4 x 4 (v-batt 2) |
| 18 | 20* | 4 x 4 (v-batt 1) |
| 19 | 20** | High Beam Relay |
| 20 | 30** | Electric Brake |
| 21 | — | Not used |
| 22 | 20** | Autolmap; Low Beam |
| 23 | 30** | Ignition Switch |
| 24 | 10* | Rear Fog Lamps |
| 25 | 20* | Security Module (horns) |
| 26 | 15* | Fuel Pump |
| 27 | 20* | Trailer Tow Lamps |
| 28 | 10* | Daytime Running Lamps (DRL) |
| 29 | 60** | PJB |
| 30 | — | Not Used |
| 31 | — | Not Used |
| 32 | — | Not Used |
| 33 | 30** | Auxiliary Blower Motor |
| 34 | 30** | Power Seats |
| 35 | — | Not Used |
| 36 | 40** | Blower Motor |
| 37 | 15* | A/C Clutch |
| 38 | 15* | Coil On Plug |
| 39 | 15* | High Beam |
| 40 | 15* | PTEC Power |
| 41 | 15* | HEGO, UMV, CMS, PTEC |
| 42 | 10* | Right Low Beam |
| 43 | 10* | Left Low Beam |
| 44 | 10* | High Beam Relay |
| 45 | 7,5* | Right High Beam (export only) |
| 46 | 15* | 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 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 | 30 CB | Delayed accessory |
| * Mini Fuses ** Maxi Cartridge Fuses | ||
Rear Relay Box
The relay box is located on the rear passenger side quarter trim panel. To access this box you must remove the trim panel.
| Relay | Description |
| Relay 14 | Rear fog lamps-export |
| Relay 15 | Trailer Tow back up lamps |
| Relay 16 | Not used |
| Relay 17 | Rear Wipers |
| Relay 18 | Trailer Tow Stop EAO |
| Relay 19 | Trailer Tow Park Lamps |
| Relay 20 | Trailer Tow Battery Charge |
| Relay 21 | Not used |
| Relay 22 | Approach Lamps |
| Relay 23 | Not Used |
| Diode 3 | Not Used |
| Diode 4 | Not Used |
Auxiliary relay box (trailer tow)
The relay box is located on the front right fender well underneath the speed control module.
| Relay | Description |
| Relay 64 | Trailer Tow (left turn) |
| Relay 65 | Trailer Tow (right turn) |
| Relay 66 | Not used |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market