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Fuse box diagram (fuse layout), location, and assignment of fuses and relays Mercury Mountaineer (2002, 2003, 2004, 2005).
Checking and Replacing Fuses
Fuses and circuit breakers protect your vehicle’s electrical system from overloading. If electrical components in the vehicle are not working, the system may have been overloaded and blown a fuse or tripped a circuit breaker. Check the appropriate fuses before replacing any electrical components. A blown fuse can be identified by a break in the wire within the fuse.
Notice
- Before replacing a fuse check that the key has been removed from the ignition and that all the services are switched off and/or disengaged.
- Always disconnect the battery before servicing high current fuses.
- Do not repair fuses and never replace a blown fuse with one that has a higher amp rating. This can severe wire damage and could start a fire.
- Never replace a broken fuse with anything other than a new fuse.
- Even after a fuse is replaced, it will continue to blow if the cause of the overload is not identified and corrected. If the fuse continues to blow, have the vehicle’s electrical system checked by your dealer or a qualified service technician.
Passenger Compartment Fuse Box
The fuse panel is located below the instrument panel on the driver’s side. To remove a fuse use the fuse puller tool provided on the fuse panel box.
| № | A | Circuits Protected |
|---|---|---|
| 1 | 30 | Memory seat module, Driver power seat (2003-2005), Driver power lumbar (2005) |
| 2 | 20 | Heated seats (2002), Moonroof |
| 3 | 20 | Radio, Amplifier, Power antenna (2002), DVD |
| 4 | 5 | Front wiper module |
| 5 | 15 | Flasher relay (Turn, hazards) |
| 6 | 10 | Right horn (2002), Key-in-chime (2003-2005) |
| 7 | 15 | Heated mirrors |
| 8 | 5 | 2004-2005: Heated PCV (4.0L engine only) |
| 9 | - | - (spare) |
| 10 | 10 | Heated backlight relay coil, Heated seat module (2002), Temp blend actuator (2002), A/C clutch contact |
| 11 | 20 | 2003-2005: Heated seats |
| 12 | 5 | 2002: Foglamp switch, 4x4 module |
| 13 | 5 | Overdrive cancel switch, Flex fuel sender (2002-2003) |
| 14 | 5 | PATS module |
| 15 | 5 | Rear wiper module, Cluster, TPMS (2002-2003) |
| 16 | 5 | Power mirror, Manual climate control, TPMS |
| 17 | 15 | Delayed acc. coil, Battery saver, Interior lamps (front and rear), Glove compartment lamp |
| 18 | 10 | Left horn (2002-2003), Flexible fuel pump (2004-2005) |
| 19 | 10 | RCM, PAD indicator (2002) |
| 20 | 5 | Memory driver seat switch, Driver seat module, Body Security Module (BSM), PATS LED, Sunload sensor (2002-2003) |
| 21 | 5 | Instrument cluster, Compass, Flasher coil |
| 22 | 10 | ABS, IVD Controller |
| 23 | 15 | 2002-2003: Brake pedal position switch, Driver brake applied relay, Redundant cruise deactivate switch |
| 24 | 15 | Cigar lighter, OBD II |
| 25 | 5 | Mode-Temperature actuator for auxiliary climate control, Trailer tow battery charge coil, TPMS (2004-2005) |
| 26 | 7.5 | Reverse park aid, Brake shift interlock, Approach lamp relay coil (2002), IVD switch |
| 27 | 7.5 | Automatic dimming mirror, Digital transmission range sensor, Backup lamps |
| 28 | 5 | Radio (Start)/DVD (Start) |
| 29 | 10 | Digital transmission range sensor, PWR feed to fuse #28 (Start feed) |
| 30 | 5 | Daytime Running Lamps (DRL), Remote solenoid, DEATC climate controller, Manual climate control, Manual climate control temp blend actuator |
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The top side of the panel
These relays are located on the reverse side of the passenger compartment fuse panel. See your dealer or a certified technician for service of this relay box.
| № | Circuits Protected |
|---|---|
| 1 | Flasher |
| 2 | Rear defrost |
| 3 | Delayed accessory |
| 4 | Open |
| 5 | Battery saver |
| 6 | Open |
| 7 | Open |
Engine Compartment Fuse 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 overloads.
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| № | A | Circuits Protected |
|---|---|---|
| 1 | 60 | PJB |
| 2 | 30 | BSM |
| 3 | - | - |
| 4 | 30 | Rear defrost |
| 5 | 40 | Anti-lock Brake System (ABS) pump |
| 6 | 60 | Delayed accessory, Power windows (2004-2005), Audio (2004-2005) |
| 7 | 20 | Power point #2 |
| 8 | - | - |
| 9 | 20 | Power point #1 |
| 10 | 30 | ABS module (valves) |
| 11 | 40 | PTEC (2002-2003), Powertrain Control Module (PCM) (2004-2005) |
| 12 | 50 | Ignition relay/Starter relay |
| 13 | 40 | Trailer tow battery. Trailer tow turn signals |
| 14 | 10 | 2002-2003: Daytime Running Lamps (DRL) (Canada) |
| 15 | 15 | Memory (KAPWR) (2002), Memory (PCM/DEATC/Cluster) (2003-2005), Courtesy lamps (2003-2005) |
| 16 | 15 | Headlamp switch (2002-2003), Foglamp switch (2003), Park lamps (2004-2005), Autolamp parklamps (2004-2005), Front foglamps relay coil (2004-2005) |
| 17 | - | - |
| 18 | 20 | 4x4 (v-batt 1) (2002-2003), PCM with two-speed 4x4 clutch (2004-2005) |
| 19 | 20 | High beam relay |
| 20 | 30 | Trailer electric brake module |
| 21 | 30 | Front wiper motor |
| 22 | 20 | Autolamp; Low beam |
| 23 | 30 | Ignition switch, PCM diode (2004-2005) |
| 24 | - | - |
| 25 | 15 | 2004-2005: Brake on-off |
| 26 | 15 | 2002-2003: Fuel pump |
| 20 | 2004-2005: Fuel pump | |
| 27 | 20 | Trailer tow lamps, Trailer tow back-up |
| 28 | 20 | Horn relay |
| 29 | 60 | PJB |
| 30 | 20 | Rear wiper motor |
| 31 | - | - |
| 32 | - | - |
| 33 | 30 | Auxiliary blower motor |
| 34 | 30 | Power seats, Adjustable pedals |
| 35 | 20 | Rear power point (2002) |
| 36 | 40 | Blower motor |
| 37 | 15 | A/C clutch relay/Transmission |
| 38 | 15 | Coil on plug (2002-2003), HEGO (2004-2005), VMV (2004-2005), CMS (2004-2005), ESM (2004-2005), CVS (2004-2005) |
| 39 | 15 | Injectors/Fuel pump relay |
| 40 | 15 | PTEC power (2002-2003), PCM power (2004-2005) |
| 41 | 15 | HEGO (2002-2003), VMV (2002-2003), CMS (2002-2003), PTEC (2002-2003), Coil on plug (2004-2005; 4.6L engine only), Ignition coil (2004-2005; 4.0L engine only) |
| 42 | 10 | Right low beam |
| 43 | 10 | Left low beam |
| 44 | 15 | Front foglamps |
| 45 | 5 | Brake pressure switch (2002) |
| 2 | Brake pressure switch (ABS) (2003-2005) | |
| 46 | 20 | High beams |
| 62 | 30 | Circuit Breaker: Delayed accessory (2002), Power windows (2003-2005) |
| 47 | Horn | |
| 48 | Fuel pump | |
| 49 | High beam | |
| 50 | Fog lamp | |
| 51 | 2002-2003: Daytime Running Lamps | |
| 52 | A/C clutch | |
| 53 | Trailer tow right turn | |
| 54 | Trailer tow left turn | |
| 55 | Blower motor | |
| 56 | Starter | |
| 57 | 2002-2003: PTEC | |
| 2004-2005: PCM | ||
| 58 | Ignition | |
| 59 | 2002-2003: Driver brake applied or Daytime Running Lamps | |
| 60 | PCM | |
| 61 | A/C clutch | |
Rear Relay Box
The relay box is located on the rear passenger side quarter trim panel. See your dealer or a certified technician for service of this relay box.
| № | Circuits Protected |
|---|---|
| 14 | - |
| 15 | Trailer tow back-up lamps |
| 16 | - |
| 17 | - |
| 18 | - |
| 19 | Trailer tow park lamps |
| 20 | Trailer tow battery charge |
| 21 | - |
| 22 | 2002: Approach lamps |
| 23 | - |
| 3 | - |
| 4 | - |
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