Rick's Free Auto Repair Advice

2008 Explorer Fuse Box Diagram: Exploring the Fuse Boxes

2008 Explorer Fuse Box Diagram: Find the correct fuse for the circuit

This 2008 Explorer Fuse Box Diagram article shows two fuse boxes. The power distribution box is also called the battery junction box and is located under the hood on the driver’s side near the firewall. It’s a rectangular box next to the brake master cylinder. The fuse and relays for the higher-powered devices are located in that fuse box.

The Power distribution box is a new design for the 2008 model year. The fuse and relay layout is completely different from previous years.

The Passenger Compartment Fuse Box, also called the Smarty Junction box, is located under the dash on the driver’s side.

To learn more about automotive fuses, see this article

To learn how to check a fuse visually or without removing it, see this article

Find the most commonly replaced fuses here

The fuse box diagram and table below show all 62 fuses and all the relays. But most DIYers are looking for fuses and relays for the lights, power ports, and the blower motor. I’ve listed the most commonly checked/replaced fuses here to save time. I’ve also listed the most commonly replaced bulbs. A blown fuse or bulb are the two most common reasons for lighting issues.

SJB= Smart Junction Box/Passenger Compartment Fuse Box. PDB=Power Distribution Box

Backup Light: Fuse #15 10A SJB
Blower Motor: Fuse #16 40A PDB, Auxiliary Blower Motor Fuse #18 30A PDB
Headlight Low and High Beam Passenger Side: Fuse #29 10A PDB
Headlight Low and High Beam Driver’s Side: Fuse #34 10A PDB
Horn: Fuse #14 20A SJB
Power Ports: Rear Power Point Fuse #21 20A PDB, Front Power Point/Cigar Lighter Fuse #25 20A PDB,
Stop/Turn/Brake: Fuses #22 15A, SJB
Parking lamps: Fuse #26 15A SJB

A note about fuses, battery power and keep alive memory

If you disconnect the battery or remove the PCM fuses from the fuse box, the PCM will lose its adaptive memory and baseline throttle body position. You can avoid this by providing backup power using a jumper pack and an inexpensive OBDII cable. See this article for more information on providing backup power to prevent the loss of adaptive memory. Or, you can perform a throttle body relearn procedure and then drive the vehicle so it can relearn the new adaptive memory settings. See this article for instructions on how to perform a 2014 F150 throttle body relearn procedure.

2008 Explorer Fuse Box Diagram for Battery Junction Box/Power Distribution Box

The power distribution box is located in the engine compartment on the driver’s side. Find it near the firewall next to the master cylinder and wiper motor. The power distribution box contains high-current fuses that protect your vehicle’s main electrical systems from overloads.

2007 explorer power distribution Box

How to find your fuse and the devices served by that fuse

There are 60 fuse/relay slots in the Battery Junction Box. The chart shows only 10 to speed up load time. Here’s how to find the fuse and circuit you want.
1) Change the number of entries showing (in the Show Entries Box) to 100 and scroll the list.
2) Enter the name of the component you’re searching for in the Search box.
3) Use the Next/Previous buttons at the bottom of the table
This image shows how to navigate the table below
PJB= Passenger Junction Box
HEGO = Heated Exhaust Gas Oxygen Sensor
VMV= Vapor Mangement Valve
PTEC= Powertrain Electronic Control Module (PCM)
CMS= Central Security Module
BSM= Body Security Module
CHMSL= Center High Mounted Stop Light

Fuse numberAmperageCircuits protected
F150BATT 2 (Smart Junction
F250BATT 3 (Smart Junction
F350BATT 1 (Smart Junction
F430Fuel pump, Injectors
F530Third row seat (left)
F640ABS pump
F740Powertrain Control Module (PCM)
F840Heated windshield (left)
F940Heated windshield (right)
F1030Power seat (right)
F1230Third row seat (right)
F1330Trailer tow battery charger
F1430/40Memory seats (DSM)/Non-memory seats
F1540Rear defrost, Heated mirrors
F1640Front Blower motor
F1730Trailer electronic brakes
F1830Auxiliary blower motor
F1930Running boards
F2030Front wiper motor
F2120Rear power point
F2410Powertrain Control Module (PCM) KAP, CAN vent
F2520Front power point/Cigar lighter
F26204x4 module
F27206R Transmission module
F2820Heated seats
F2920Headlamps (right)
F3025Rear wiper
F3115Fog lamps
F325Power mirrors
F3330ABS valve
F3420Headlamps (left)
F3510AC clutch
F3620Console bin power point
F3730Driver window motor
F38155R Transmission (4.0L engine only)
F3915PCM power
F4015Fan clutch, PCV valve, AC clutch relay, GCC fan
F4215Redundant brake switch, EVMV, MAFS, HEGO, EVR, VCT1, VCT2, CMCV, CMS
F4315Coil on plug (4.6L engine only), Coil tower (4.0L engine only)
F45ANot used
F45BRelayGCC fan relay
F46ANot used
F46BNot used
F49RelayFuel pump relay
F50ARelayFog lamps relay
F50BRelayAC clutch relay
F51Not used
F52Not used
F53One Touch Integrated Start (OTIS) (diode)
F54RelayTrailer battery charger relay
F55ARelayPCM relay
F55BRelayFront wiper relay
F56ARelayBlower relay
F56BRelayStarter relay

Explorer Fuse Box Diagram for Cabin/Passenger Compartment Fuse Panel

The cabin fuse panel is located on the far left-hand side of the instrument panel. Ford refers to this as the passenger compartment fuse box or the smart junction box (SJB).

2006 explorer passenger Fuse box

Fuse numberAmperageCircuits protected
F120Moonroof, Adjustable pedals, DSM, Memory lumbar motor
F25Microcontroller power (SJB)
F420OBD II connector
F55Moonroof, Door lock switch illumination, Rearview mirror with
F620Liftglass release motor, Door unlock/lock
F715Trailer stop/turn
F815Ignition switch power, PATS
F926R TCM/PCM (Ignition
RUN/START), Fuel pump relay
F105Front wiper RUN/ACC relay in PDB
F115Radio start
F125Rear wiper motor RUN/ACC, Trailer battery charge relay in PDB, Radio
F1315Heated mirror, Rear defrost indicator
F1510Reverse lamps
F1610Trailer reverse lamps
F1710RCM, PAD lamp, OCS module
F1810Reverse park aid, IVD switch, IVD, 4x4 module, 4x4 switch, Heated seat switches, Compass,
Electrochromatic mirror, AUX climate control
F19Not used
F2010Manual climate, DEATC, Brake shift
F21Not used
F2215Brake switch, Bi-color stop lamps, CHMSL all turn lamps
F2315Power mirrors, Interior lamps, Puddle lamps, Battery saver,
Instrument illumination, Homelink
F2410Cluster, Theft LED
F2515Trailer park, Trailer electronic brake module
F2615License plate/rear park lamp, Front park lamps, Manual climate
F2715Tri-color stop lamps
Circuit Breaker 125AWindows

Auxiliary Relay Panel

Locate the Auxiliary Relay Panel in the cabin on either side of the Cabin Fuse Panel
Relay 1 Delayed ACC

Tips to diagnose electrical issues on your 2008 Explorer

Headlight operation

Unlike in older models, the multifunction headlight switch does not switch power to the headlights. It is simply a request for headlights. The multifunction switch has a series of resistors that drop voltage as you turn the stalk. The smart junction box determines whether you’re requesting parking lights, headlights, or high-beam lights based on the voltage drop. The actual power switching of power from the headlight fuse to the headlights is done inside the smart junction box.

If your headlights aren’t working and the headlight fuses are good, the easiest way to diagnose the problem is to use a bidirectional scan too to view live data from the smart junction box. You will see that on the scan tool if it’s receiving the headlights ON request. However, if you’ve turned the stalk to headlights and the smart junction box isn’t seeing the request, then the problem is in the multifunction switch or the wiring from the MF switch to the SHB

If your power windows don’t work
• Power to the windows is provided on Fuse #1 in the PDB. It then flows to the Accessory Delay Relay in the Smart Junction Box. From there, power flows to a 25A circuit breaker for the power windows.

If your blower motor doesn’t work
The blower motor gets its power from the blower motor relay #55 in the battery junction/power distribution box.
If the circuit you’re working on contains a relay
• A simple way to test a relay is to swap in a similarly shaped relay and see if the component works.
• If that doesn’t work, remove the relay and test for power to the relay control coil and contacts using a multimeter. For more information on relay testing, see this article.
©, 2018 Rick Muscoplat

Posted on by Rick Muscoplat

Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN
Ricks Free Auto Repair Advice