Mercury Mariner 2008-2011 is the second generation of Mercury’s compact SUV. It was offered with front-wheel drive or AWD, and also as a Hybrid. The electrical layout is closely related to the Ford Escape, but model-year and Hybrid differences matter when identifying fuses.
The passenger fuse panel stayed broadly similar, while several under-hood positions changed between 2008 and 2009-2011. Hybrid models also use additional traction-battery, vacuum-pump and brake-control circuits.
The related Ford Escape II 2008-2012 uses a similar electrical architecture, but its fuse assignments should be checked against its own table.
Fuse-box locations
Passenger compartment: on the right side of the center console next to the dashboard. Remove the side trim and then the fuse-panel cover.
Engine compartment: the Power Distribution Box contains the high-current fuses and relays. Hybrid models also have an auxiliary vacuum-pump relay box on the radiator support.
Passenger-compartment fuse panel
| Position | Rating [A] | Protected component / function |
|---|---|---|
| 1 | 30 | 110 V inverter |
| 2 | 15 | Brake-pedal switch |
| 3 | 15 | 2009-2011: SYNC module |
| 4 | 30 | 2009-2011: moonroof |
| 5 | 10 | Keypad illumination, brake-shift interlock, passenger fuse panel |
| 6 | 20 | Turn signals, stop lamps |
| 7 | 10 | Left low beam |
| 8 | 10 | Right low beam |
| 9 | 15 | Interior lamps |
| 10 | 15 | Illumination |
| 11 | 10 | Four-wheel drive |
| 12 | 7.5 | Power-mirror switch |
| 13 | 7.5 | 2008: EVAP canister vent valve |
| 14 | 10 | FCIM radio controls, satellite radio, front display module, GPS module – 2010-2011 |
| 15 | 10 | Climate control |
| 16 | 15 | Spare / not used |
| 17 | 20 | Power door locks, liftgate and liftgate-glass release |
| 18 | 20 | Heated seats |
| 19 | 25 | Rear wiper |
| 20 | 15 | OBD-II diagnostic connector |
| 21 | 15 | Fog lamps |
| 22 | 15 | Parking lamps |
| 23 | 15 | High beams |
| 24 | 20 | Horn relay |
| 25 | 10 | Interior lighting |
| 26 | 10 | Instrument cluster |
| 27 | 20 | Ignition switch |
| 28 | 5 | Radio |
| 29 | 5 | Instrument cluster |
| 30 | 5 | 2008: overdrive cancel |
| 31 | 10 | Airbag module |
| 32 | 10 | 2010-2011: rear video camera module |
| 33 | 10 | 2008: speed-control switch |
| 34 | 5 | 2008: speed-control deactivation switch, ABS |
| 35 | 10 | 4WD, electric power steering, parking-aid module, Active Park Assist module – 2010-2011, 110 V inverter module |
| 36 | 5 | PATS transceiver |
| 37 | 10 | Climate control |
| 38 | 20 | Subwoofer / amplifier – Audiophile / Premium radio |
| 39 | 20 | Radio, radio amplifier for navigation – 2010-2011 |
| 40 | 20 | Front 12 V power outlet |
| 41 | 15 | Driver/passenger door switches, electrochromic mirror, compass, ambient lighting, moonroof, mirror-mounted camera display |
| 42 | 10 | Spare / not used |
| 43 | 10 | Rear-wiper control, heated-seat relay, instrument cluster |
| 44 | 10 | Spare / not used |
| 45 | 5 | Front-wiper control, blower-motor relay |
| 46 | 7.5 | Occupant Classification System, passenger-airbag deactivation indicator |
| 47 | 30 | Circuit breaker: power windows, moonroof – 2008 |
| Relay | ||
| 48 | Relay | Delayed accessories |
Engine-compartment power distribution box
The physical box differs visually between 2008 and 2009-2011, while the table below preserves all year and Hybrid-specific variants as separate rows.
2008 layout
2009-2011 layout
| Position | Rating [A] | Protected component / function |
|---|---|---|
| A | 80 | Electronic Power Assist Steering module |
| B | 125 | Passenger-compartment fuse panel / SPDJB |
| 1 | 15 | Heated mirrors |
| 2 | 30 | Heated rear window |
| 3 | 20 | Rear console 12 V power outlet |
| 4 | 20 | 2008: fuel pump – non-Hybrid |
| 40 | Hybrid: electric vacuum pump | |
| 5 | 10 | PCM; PCM relay and canister vent for 2009-2011; Hybrid transmission-control module |
| 6 | 15 | Non-Hybrid: alternator |
| 7 | 10 | 2008: reversing lamps |
| 15 | 2009-2011: liftgate latch | |
| 8 | 20 | Trailer-tow lamps |
| 5 | Hybrid: traction-battery control module | |
| 9 | 50 | ABS; Hybrid: brake-control module |
| 10 | 30 | Front wipers |
| 11 | 30 | Non-Hybrid: starter |
| 12 | 40 | Blower motor |
| 13 | 10 | A/C clutch |
| 14 | 15 | Non-Hybrid: trailer marker lamps |
| 10 | Hybrid: coolant heater / pump | |
| 15 | 10 | Hybrid: Traction Battery Control Module |
| 16 | 40 | Cooling fan 1 |
| 17 | 40 | Cooling fan 2 |
| 18 | 20 | Non-Hybrid: ABS solenoids |
| 50 | Hybrid: brake-control-module solenoid | |
| 19 | 30 | Power seats |
| 22 | 20 | 2009-2011: fuel pump – non-Hybrid |
| 15 | Hybrid: ignition coils | |
| 23 | 15 | 2009-2011: fuel injectors – non-Hybrid |
| 24 | 10 | 2008: PCM transmission circuit – non-Hybrid. Hybrid: transmission-control module |
| 25 | 5 | 2009-2011: ABS – non-Hybrid. Hybrid: traction-battery control module, thermal expansion valve |
| 26 | 10 | 2008: PCM MIL circuit – non-Hybrid |
| 15 | 2009-2011: ignition coils – non-Hybrid | |
| 20 | Hybrid: fuel pump, traction-battery control module | |
| 27 | 10 | 2008: PCM non-MIL circuit. 2009-2011: PCM general powertrain malfunction-indicator circuit |
| 28 | 15 | 2008: PCM – non-Hybrid. Hybrid: HEGO sensor, PCM MIL circuit |
| 20 | 2009-2011: PCM emission-related powertrain-control circuits – non-Hybrid | |
| 29 | 15 | 2008: ignition coils. 2009-2011: PCM |
| 32 | – | Hybrid: A/C clutch diode |
| 33 | – | PCM diode |
| 34 | – | Non-Hybrid: starter diode |
| 35 | 10 | Reversing-lamp relay, speed-control module – 2008, rear-defrost relay, RUN/START – 2009-2011 |
| 36 | – | Not used |
| 37 | – | Not used |
| Relay | ||
| 20 | Relay | A/C clutch |
| 21A | Relay | Heated rear window |
| 21B | Relay | 2009-2011: fuel pump. Hybrid: ignition |
| 21C | Relay | Blower |
| 21D | Relay | PCM |
| 30 | Relay | Cooling fan 1 |
| 30B | Relay | Starter. Hybrid: electric vacuum pump |
| 30C | Relay | Main cooling fan |
| 30D | Relay | Cooling fan 2 |
| 31A | Relay | Reversing lamp |
| 31B | Relay | 2008: fuel pump |
| 31C | Relay | Non-Hybrid: left trailer turn signal. Hybrid: heat pump |
| 31D | Relay | Non-Hybrid: right trailer turn signal. Hybrid: coolant pump |
| 31E | Relay | Non-Hybrid: trailer parking lamps |
| 31F | Relay | 2009-2011: liftgate latch |
Hybrid auxiliary relay box
| Position | Rating [A] | Protected component / function |
|---|---|---|
| 1 | – | Not used |
| 2 | – | Not used |
| 3 | – | Not used |
| 4 | 5 | Vacuum-pump monitor |
| 5 | – | Not used |
| 6 | – | Not used |
| Relay | ||
| R1 | Relay | Electric vacuum pump – solid-state |
Commonly checked fuses
- OBD-II: cabin position 20 – 15 A.
- Front 12 V outlet: cabin position 40 – 20 A.
- Fuel pump, 2008 gasoline: under-hood position 4 – 20 A, relay 31B.
- Fuel pump, 2009-2011 gasoline: position 22 – 20 A, relay 21B.
- ABS: position 9 – 50 A; non-Hybrid models also use position 18 – 20 A for the ABS solenoids.
- Radio: cabin position 39 – 20 A, with control supply at position 28 – 5 A.
FAQ – Mercury Mariner 2008-2011 fuses
Where is the passenger fuse panel?
On the right side of the center console next to the dashboard, behind the removable side trim and fuse-panel cover.
Does the Hybrid use the same fuse layout as the 3.0 V6?
No. Several under-hood positions have different ratings or functions, and the Hybrid adds a separate vacuum-pump relay box.
Why is the fuel-pump fuse different between 2008 and 2010?
On gasoline models, 2008 uses position 4 – 20 A. For 2009-2011 the fuel-pump fuse moves to position 22 – 20 A.
Can I use a Ford Escape diagram?
The models are closely related, but individual assignments can differ, especially between gasoline and Hybrid versions. Use the Mariner-specific table for diagnosis.