The 2018 Ford Expedition IV is the first model year of the fourth-generation full-size SUV. Compared with the 2015-2017 Expedition, the electrical architecture changed substantially, so earlier fuse numbers should not be used for the 2018 model.
The vehicle has two main fuse panels: the power distribution box in the engine compartment and the passenger-compartment fuse panel. Ford’s owner information lists dedicated circuits for the 4×4 system, electronic limited-slip differential (eLSD), power running boards, five power points, several USB chargers, trailer equipment and the power liftgate.
Where are the fuse boxes in a 2018 Ford Expedition?
Under-hood power distribution box: located in the engine compartment beneath a large black cover. It contains high-current fuses for the vehicle’s main systems. Before servicing high-current fuses, disconnect the 12 V battery and reinstall the cover before reconnecting the battery.
Passenger-compartment fuse panel: located on the right-hand side of the front passenger footwell, behind the side trim panel. Pull the trim panel toward you and move it aside, then release the fuse-box cover clips.
Under-hood power distribution box
| Fuse / relay | Rating [A] | Protected component / function |
|---|---|---|
| 1 | 25 | Horn |
| 2 | 50 | Electric fan 1 |
| 3 | 30 | Front wiper motor |
| 4 | – | Not used |
| 5 | 30 | Starter relay |
| 6 | 20 | Power point 1 |
| 8 | 20 | Power point 2 |
| 10 | 5 | Rain sensor |
| 12 | – | Not used |
| 13 | 10 | 4×4 module, heated rear window and mirrors, heated wiper park area |
| 14 | 15 | Transmission control module |
| 15 | 15 | BLIS, head-up display, front/rear cameras, image processing module B, cruise control |
| 16 | 10 | Powertrain control module – run/start |
| 17 | 10 | Anti-lock brake system – run/start |
| 18 | 10 | Electronic power-assist steering – run/start |
| 19 | – | Not used |
| 20 | 40 | Front blower motor |
| 21 | 40 | Passenger seat motors |
| 22 | 20 | Not used (spare) |
| 23 | 10 | Alternator A-line |
| 24 | 30 | Trailer brake controller |
| 25 | 50 | Body control module – power 1 |
| 26 | 50 | Electric fan 3 |
| 27 | 40 | Driver seat motors |
| 28 | 15 | Rear heated seats |
| 29 | 10 | Integrated wheel-end solenoid |
| 30 | 25 | Trailer battery charge |
| 31 | 50 | Power-folding seat module |
| 32 | 10 | A/C clutch |
| 33 | – | Not used |
| 34 | – | Not used |
| 35 | 20 | Vehicle power 4 |
| 36 | 10 | Vehicle power 3 |
| 37 | 25 | Vehicle power 2 |
| 38 | 25 | Vehicle power 1 |
| 39 | – | Not used |
| 41 | 50 | Inverter |
| 43 | 20 | Trailer lighting module |
| 45 | 20 | Front/rear washer pump |
| 46 | 7.5 | Rear-seat entertainment system |
| 47 | – | Not used |
| 48 | – | Not used |
| 49 | – | Not used |
| 50 | 30 | Fuel pump |
| 51 | 20 | Power point 3 |
| 52 | 50 | Body control module / Voltage Quality Module |
| 53 | 25 | Trailer parking lamps |
| 54 | 40 | Electronic limited-slip differential (eLSD) |
| 55 | 40 | Auxiliary blower |
| 56 | 20 | Power point 4 |
| 58 | 5 | Spare |
| 59 | – | Not used |
| 60 | 5 | Spare |
| 61 | 25 | Spare |
| 62 | 25 | Spare |
| 63 | 25 | 4×4 module |
| 64 | – | Not used |
| 65 | – | Not used |
| 66 | – | Not used |
| 67 | – | Not used |
| 69 | – | Not used |
| 70 | 40 | Anti-lock brake system / electric parking brake |
| 71 | 25 | 4×4 module |
| 72 | – | Not used |
| 73 | – | Not used |
| 74 | 10 | Trailer backup lamps |
| 75 | – | Not used |
| 76 | 50 | Body control module – power 2 |
| 77 | 30 | Heated / ventilated seats |
| 78 | 20 | Spare |
| 79 | – | Not used |
| 80 | 10 | Heated wiper park area |
| 81 | – | Not used |
| 82 | – | Not used |
| 83 | 15 | Transmission control module power |
| 84 | – | Not used |
| 85 | – | Not used |
| 86 | 5 | USB smart charger 5 |
| 87 | 5 | USB smart charger 3 |
| 88 | 10 | Multi-contour seat relay |
| 89 | 40 | Power running boards |
| 91 | 30 | Power liftgate module |
| 93 | 15 | Heated mirrors |
| 94 | 5 | USB smart charger 1 |
| 95 | 10 | USB smart charger 2 |
| 96 | 30 | Rear wiper motor relay |
| 97 | 40 | Intercooler fan |
| 98 | 15 | Transmission oil pump |
| 99 | 40 | Heated rear window |
| 100 | 20 | Power point 5 |
| 101 | 25 | Electric fan 2 |
| 102 | – | Not used |
| 103 | – | Not used |
| 104 | – | Not used |
| 105 | – | Not used |
| R02 | relay | Electric fan 2 |
| R05 | relay | Powertrain control module |
For diagnosis, it is useful to know that the Expedition is closely related to the 2018 Lincoln Navigator. Both are full-size Ford SUVs and share part of their electrical architecture, but the fuse assignments are not interchangeable without checking the model-specific chart.
Passenger-compartment fuse panel
| Fuse | Rating [A] | Protected component / function |
|---|---|---|
| 1 | – | Not used |
| 2 | 7.5 | Driver seat switch |
| 3 | 20 | Driver door unlock |
| 4 | 5 | Trailer brake controller |
| 5 | 20 | Speaker amplifier |
| 6 | 10 | Spare |
| 7 | 10 | Spare |
| 8 | – | Not used |
| 9 | 10 | Rear-seat entertainment system, head-up display |
| 10 | 5 | Wireless charger, hands-free liftgate and power liftgate |
| 11 | 5 | Keypad, combined sensor module |
| 12 | 7.5 | Instrument cluster, control panel, Smart Data Link logic |
| 13 | 7.5 | Gear shift module, steering column control module |
| 14 | 10 | Extended Power Module, brake switch |
| 15 | 10 | Smart Data Link power |
| 16 | 15 | Liftgate glass release |
| 17 | 5 | Modem / telematics |
| 18 | 5 | Ignition switch, key lock, START button |
| 19 | 7.5 | Transmission switch, gear shift module |
| 20 | 7.5 | Not used |
| 21 | 5 | Cabin humidity and temperature sensor |
| 22 | 5 | Electrochromic mirror, second-row heated seats |
| 23 | 10 | Moonroof, inverter, windows and mirrors |
| 24 | 20 | Central locking |
| 25 | 30 | Left-hand front door module |
| 26 | 30 | Right-hand front door module |
| 27 | 30 | Moonroof |
| 28 | 20 | Stereo amplifier |
| 29 | 30 | Left-hand rear door module |
| 30 | 30 | Right-hand rear door module |
| 31 | 15 | Adjustable pedals |
| 32 | 10 | SYNC, drive modes, 4×4 switch, RF receiver, rear climate control |
| 33 | 20 | Audio control module |
| 34 | 30 | Run/start relay |
| 35 | 5 | Extended Power Mode Module |
| 36 | 15 | Image processing module A, automated parking, continuous controlled damping |
| 37 | 20 | Heated steering wheel |
| 38 | 30 | Rear power-window circuit breaker |
Useful circuit references for the 2018 Expedition
- eLSD: fuse 54 – 40 A.
- 4×4: fuses 13, 63 and 71, depending on the part of the system.
- Power running boards: fuse 89 – 40 A.
- Power liftgate: fuse 91 – 30 A, plus passenger-panel fuse 10 for the related control modules.
- USB charging: fuses 86, 87, 94 and 95.
- Trailer circuits: fuses 24, 30, 43, 53 and 74.
FAQ – 2018 Ford Expedition fuses
What should I check if the power running boards do not deploy?
The main protection is fuse 89 – 40 A. If the fuse is intact, check the running-board module, door-status inputs and the mechanical drive.
Which fuses matter when the 4×4 system is not working correctly?
Depending on the symptom, check fuse 13 for a control feed, fuse 63 for the 4×4 module and fuse 71 for another 4×4 module circuit.
Why can one 12 V power point fail while the others still work?
The Expedition has separately protected power points. Key fuses include 6, 8, 51, 56 and 100, so one failed outlet does not necessarily affect the others.
What should I check if the central locking works but the power liftgate does not?
Start with fuse 91 – 30 A under the hood and fuse 10 – 5 A in the passenger-compartment panel.
Can I use the 2015-2017 fuse diagram for a 2018 Expedition?
No. The 2018 model starts the fourth generation and uses a different electrical architecture and fuse numbering.