Mercury Mountaineer 2002-2005 uses an engine-compartment Power Distribution Box, a rear relay box, a passenger-compartment fuse panel and an auxiliary relay block. Several circuits changed between 2002-2003 and 2004-2005.
Previous: Mountaineer 1997-2001. Next: Mountaineer 2006-2010.
Engine-compartment Power Distribution Box
| Position | Rating [A] | Protected component / function |
|---|---|---|
| 1 | 60 | Passenger Junction Box |
| 2 | 30 | Body Security Module |
| 3 | – | Not used |
| 4 | 30 | Heated rear window |
| 5 | 40 | ABS pump |
| 6 | 60 | Delayed accessories, power windows – 2004-2005, audio – 2004-2005 |
| 7 | 20 | Power point No. 2 |
| 8 | – | Not used |
| 9 | 20 | Power point No. 2 |
| 10 | 30 | ABS module – valves |
| 11 | 40 | PTEC – 2002-2003, PCM – 2004-2005 |
| 12 | 50 | Ignition / starter-relay feed |
| 13 | 40 | Trailer-tow battery charge and trailer-tow signals |
| 14 | 10 | 2002-2003: Daytime Running Lamps – Canada |
| 15 | 15 | Keep-alive power – 2002; PCM / DEATC / cluster memory – 2003-2005; courtesy lamps – 2003-2005 |
| 16 | 15 | Light switch – 2002-2003; fog-lamp switch – 2003; parking lamps and autolamp parking lamps – 2004-2005; fog-lamp relay coil – 2004-2005 |
| 17 | – | Not used |
| 18 | 20 | 4×4 battery feed 1 – 2002-2003; PCM two-speed 4×4 clutch – 2004-2005 |
| 19 | 20 | High-beam switch |
| 20 | 30 | Electric trailer-brake module |
| 21 | 30 | Front wiper motor |
| 22 | 20 | Autolamps, low beams |
| 23 | 30 | Ignition switch, PCM diode – 2004-2005 |
| 24 | – | Not used |
| 25 | 15 | 2004-2005: brake on/off |
| 26 | 15 | 2002-2003: fuel pump |
| 20 | 2004-2005: fuel pump | |
| 27 | 20 | Trailer-tow stop / reversing lamps |
| 28 | 20 | Horn relay |
| 29 | 60 | Passenger Junction Box |
| 30 | 20 | Rear-wiper motor |
| 31 | – | Not used |
| 32 | – | Not used |
| 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, VMV, CMS, ESM and CVS – 2004-2005 |
| 39 | 15 | Fuel injectors / fuel-pump relay |
| 40 | 15 | PTEC power – 2002-2003; PCM power – 2004-2005 |
| 41 | 15 | HEGO, VMV, CMS and PTEC – 2002-2003; coil-on-plug – 2004-2005 4.6 L; ignition coil – 2004-2005 4.0 L |
| 42 | 10 | Right low beam |
| 43 | 10 | Left low beam |
| 44 | 15 | Front fog lamps |
| 45 | 5 | Brake-pressure switch – 2002 |
| 2 | Brake-pressure switch / ABS – 2003-2005 | |
| 46 | 20 | High beams |
| 62 | 30 | Circuit breaker: delayed accessories – 2002; power windows – 2003-2005 |
| Relay | ||
| 47 | Relay | Horn |
| 48 | Relay | Fuel pump |
| 49 | Relay | High beams |
| 50 | Relay | Fog lamps |
| 51 | Relay | 2002-2003: Daytime Running Lamps |
| 52 | Relay | A/C clutch |
| 53 | Relay | Trailer-tow right turn |
| 54 | Relay | Trailer-tow left turn |
| 55 | Relay | Blower motor |
| 56 | Relay | Starter |
| 57 | Relay | 2002-2003: PTEC; 2004-2005: PCM |
| 58 | Relay | Ignition |
| 59 | Relay | 2002-2003: lamps activated by brake / Daytime Running Lamps |
| Diode | ||
| 60 | Diode | PCM |
| 61 | Diode | A/C clutch |
Rear relay box
| Position | Function |
|---|---|
| 14 | Not used |
| 15 | Trailer-tow lamps |
| 16 | Not used |
| 17 | Not used |
| 18 | Not used |
| 19 | Trailer-tow parking lamps |
| 20 | Trailer-tow battery charge |
| 21 | Not used |
| 22 | 2002: approach lamps |
| 23 | Not used |
| Diode | |
| 3 | Not used |
| 4 | Not used |
Passenger-compartment fuse panel
| Position | Rating [A] | Protected component / function |
|---|---|---|
| 1 | 30 | Memory-seat module, driver seat – 2003-2005, driver lumbar – 2005 |
| 2 | 20 | Heated seats – 2002, moonroof |
| 3 | 20 | Radio, amplifier, power antenna – 2002, DVD |
| 4 | 5 | Front-wiper module |
| 5 | 15 | Lighting relay / hazard switch |
| 6 | 10 | Right horn – 2002; entry chime – 2003-2005 |
| 7 | 15 | Heated mirrors |
| 8 | 5 | 2004-2005: heated PCV – 4.0 L only |
| 9 | – | Not used / spare |
| 10 | 10 | Heated-backlight relay coil, heated-seat module – 2002, temperature-blend actuator – 2002, A/C clutch switch |
| 11 | 20 | 2003-2005: heated seats |
| 12 | 5 | 2002: fog-lamp switch, 4×4 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 mirrors, manual A/C, TPMS |
| 17 | 15 | Delayed-accessory relay coil, battery saver, front and rear interior lamps, glove-box lamp |
| 18 | 10 | Left horn – 2002-2003; flex-fuel pump – 2004-2005 |
| 19 | 10 | Restraints Control Module, Passenger Airbag Deactivation indicator – 2002 |
| 20 | 5 | Memory-driver-seat switch, driver-seat module, Body Security Module, PATS diode, 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-shift interlock, redundant speed-control switch |
| 24 | 15 | Cigarette lighter, OBD-II |
| 25 | 5 | Auxiliary climate-control temperature actuator, trailer-tow battery-charge relay coil, TPMS – 2004-2005 |
| 26 | 7.5 | Reverse parking aid, shift interlock, high-beam relay coil – 2002, IVD switch |
| 27 | 7.5 | Auto-dimming mirror, Digital Transmission Range sensor, reversing lamps |
| 28 | 5 | Radio START / DVD START |
| 29 | 10 | Digital Transmission Range sensor, power feed to fuse 28 – START |
| 30 | 5 | Daytime Running Lamps, remote-solenoid control, DEATC climate control, manual A/C, manual temperature-blend control |
Auxiliary relay block
| Position | Function |
|---|---|
| 1 | Lights |
| 2 | Heated rear window |
| 3 | Delayed accessories |
| 4 | Free / not used |
| 5 | Battery saver |
| 6 | Free / not used |
| 7 | Free / not used |
Commonly checked circuits
- Cigarette lighter / OBD-II: cabin position 24 – 15 A.
- Fuel pump: under-hood position 26 – 15 A for 2002-2003, 20 A for 2004-2005; relay 48.
- ABS: under-hood positions 5 – 40 A and 10 – 30 A; cabin position 22 – 10 A also supplies ABS/IVD control.