Mercury Mountaineer 2009 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 | 20A | Moonroof, Adjustable pedals, Memory seats, Memory lumbar motor |
| 2 | 5A | Microcontroller power (SJB) |
| 3 | 20A | Radio, Navigation amplifier |
| 4 | 20A | OBD II connector |
| 5 | 5A | Moonroof, Door lock switch illumination, Rearview mirror with microphone |
| 6 | 20A | Liftglass release motor, Door unlock/lock |
| 7 | 15A | Trailer stop/turn |
| 8 | 15A | Ignition switch power, PATS, Cluster |
| 9 | 2A | 6R TCM/PCM (Ignition RUN/START), Fuel pump relay |
| 10 | 5A | Front wiper RUN/ACC relay in PDB |
| 11 | 5A | Radio start |
| 12 | 5A | Rear wiper motor RUN/ACC, Trailer battery charge relay in PDB, Radio |
| 13 | 15A | Heated mirror, Manual climate rear defrost indicator |
| 14 | 20A | Horn |
| 15 | 10A | Reverse lamps |
| 16 | 10A | Trailer reverse lamps |
| 17 | 10A | RCM (restraints), Passenger occupancy |
| 18 | 10A | Reverse park aid, IVD switch, IVD, AWD module, Heated seat switches, Compass, Electrochromatic mirror, AUX climate control |
| 19 | - | Not used |
| 20 | 10A | Manual climate, DEATC, Brake shift |
| 21 | - | Not used |
| 22 | 15A | Brake switch, Bi-color stop lamps, CHMSL, All turn lamps |
| 23 | 15A | Interior lamps, Puddle lamps, Battery saver, Instrument illumination, Homelink |
| 24 | 2A | Cluster, Theft LED |
| 25 | 15A | Trailer tow park lamps |
| 26 | 15A | License plate/rear park lamp, Front park lamps, Manual climate |
| 27 | 15A | Tri-color stop lamps |
| 28 | 10A | Manual/DEATC |
| CB1 | 25A | Windows |
| Relays | The following relays are located on either side of the passenger compartment fuse panel | |
| Relay 1 | - | Delayed ACC |
Engine compartment fuse box:
| Fuse/Relay N° | Rating | Functions |
| 1 | 50A | BATT 2 (SJB) |
| 2 | 50A | BATT 3 (SJB) |
| 3 | 50A | BATT 1 (SJB) |
| 4 | 30A | Fuel pump, Injectors |
| 5 | 30A | Third row seat (left) |
| 6 | 40A | ABS pump |
| 7 | 40A | Powertrain Control Module (PCM) |
| 8 | - | Not used |
| 9 | - | Not used |
| 10 | 30A | Power seat (right) |
| 11 | 30A | Starter |
| 12 | 30A | Third row seat (right) |
| 13 | 30A | Trailer tow battery charger |
| 14 |
30A 40A |
Memory seats (DSM) Non-memory seats |
| 15 | 40A | Rear defrost, Heated mirrors |
| 16 | 40A | Front blower motor |
| 17 | 30A | Trailer electronic brakes |
| 18 | 30A | Auxiliary blower motor |
| 19 | 30A | Running boards |
| 20 | 30A | Front wiper motor |
| 21 | 20A | Rear power point |
| 22 | 20A | Subwoofer |
| 23 | 20A | Not used |
| 24 | 10A | Powertrain Control Module (PCM) Keep Alive Power, Canister vent |
| 25 | 20A | Front power point/Cigar lighter |
| 26 | 20A | AWD module (4.6L engine only) |
| 27 | 20A | 6R Transmission module (4.6L engine only) |
| 28 | 20A | Heated seats |
| 29 | 20A | Headlamps (right) |
| 30 | 25A | Rear wiper |
| 31 | 15A | Fog lamps |
| 32 | 5A | Power mirrors |
| 33 | 30A | ABS valve |
| 34 | 20A | Headlamps (left) |
| 35 | 10A | AC clutch |
| 36 | 20A | Console bin power point |
| 37 | 30A | Driver window motor |
| 38 | 15A | 5R Transmission (4.0L engine only) |
| 39 | 15A | PCM power |
| 40 | 15A | Fan clutch, PCV valve, AC clutch relay, GCC fan |
| 41 | 15A | SDARS, DVD, SYNC |
| 42 | 15A | Redundant brake switch, EVMV, MAFS, HEGO, EVR, VCT1 (4.6L engine only), VCT2 (4.6L engine only), CMCV (4.6L engine only), CMS |
| 43 | 15A | Coil on plug (4.6L engine only), Coil tower (4.0L engine only) |
| 44 | 15A | Injectors |
| 45A | - | Not used |
| 45B | - | GCC fan relay |
| 46A | - | Not used |
| 46B | - | Not used |
| 49 | - | Fuel pump relay |
| 50A | - | Fog lamps relay |
| 50B | - | AC clutch relay |
| 51 | - | Not used |
| 52 | - | Not used |
| 53 | - | One Touch Integrated Start (OTIS) (diode) |
| 54 | - | Trailer battery charger relay |
| 55A | - | PCM relay |
| 55B | - | Front wiper relay |
| 56A | - | Blower relay |
| 56B | - | Starter relay |
