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2012 Mustang Fuse Box Diagram

2012 Mustang Fuse Box Diagram: Exploring the Fuse Boxes

In this article, you’ll see the 2012 Mustang fuse box diagrams for the battery junction box/power distribution box under the hood, as well as the passenger compartment fuse box/body control module (BCM)/smart junction box located under the dash on the passenger side of the vehicle.

Let’s start with the one under the hood. It’s located near the front of the engine compartment on the passenger side. The power distribution box is like the nerve center for your truck’s major systems—things like engine management, emissions, and ABS brakes are all controlled by the fuses in this box.

Now, for the second fuse box, crawl under the dash on the passenger side. The passenger compartment fuse box is located in the footwell area, on the passenger side, and behind the kick panel. This fuse box takes care of all the interior electrical stuff like the radio, power windows/locks, climate controls, and those handy courtesy lights. It’s essential to give both of these fuse boxes a once-over every so often to make sure none of the fuses are blown. If your electrical gadgets aren’t acting right, it might be a sign that something’s amiss with the fuses.

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 and bulbs 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.

Power Distribution Box = PDB, Passenger Compartment Fuse Box = PCFB

Turn signals/Hazards: Fuse #6 20A PCFB
Parking Lamps: Fuse #22 15A PCFB
Driver Side Low Beam Headlight: Fuse #7 10A PCFB
Passenger Side Low Beam Headlight: Fuse #8 10A PCFB
High Beam Headlights (Both Sides): fuse #23 15A PCFB
Horn: Fuse #24 20A PCFB
Power Point: Fuse #5 20A PDB
Passenger Power Window: Fuse #29 30A PDB
Driver Power Window: Fuse #34 30A PDB
Blower Motor: Fuse #4 30A PDB

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

There are 62 fuses in the Battery Junction Box. There are several ways to find the fuse you want in the chart below.
1) Enter the number in the search box. That’s the fastest way
2) If you’d like to scroll all the fuses, change the Number of entries to show on the page in “Show Entries” box. Click NEXT or PREVIOUS at the bottom right of the table

This image shows how to navigate the table below

2012 Mustang Fuse Box Diagram for Power Distribution Box

2012 Mustang underhood fuse box diagram

2012 Mustang underhood fuse box diagram

Fuse NumberAmperageCircuits Protected
F1😯Passenger compartment fuse panel, Smart Junction Box (SJB)
F2Not used
F3Not used
F430Blower motor relay
F520Power point
F640Rear defroster
F740High and Low speed engine cooling fan relays
F840nti-lock Brake System (ABS) module
F930Wiper relay
F1030Anti-lock Brake System (ABS) module
F11Not used
F12Not used
F1320/25Fuel pump relay (non-Shelby)/Fuel pump relay (Shelby only)
F14Not used
F1510Intercooler pump relay (Shelby
F1620Heated seats
F1710Alternator sense
F1820Auxiliary body module (ABM)
F1930Starter relay
F2030Rear amplifier (Shaker 1000 radio)
F2130Powertrain relay
F2220Powerpoint (instrument panel)
F2310Powertrain control module (PCM)
keep-alive power
F2410Brake on/off (BOO) power
F2510A/C compressor relay
F2620Left high intensity discharge
headlamp relay
F2720Right high intensity discharge
headlamp relay
F28Not used
F2930Passenger front window
F30Not used
F3130Passenger power seat
F3230Driver power seat
F3330Front amplifier (Shaker 500 radio)
F3430Driver front window motor
F3540Convertible top motor
F36DiodeFuel diode
F37Not used
F3815Fuel injectors (Shelby only)
F395Rear defroster coil (run/start)
F4015PCM vehicle power 4 – ignition coil
F41G8VA relayFuel pump relay
F42G8VA relayIntercooler pump relay (Shelby
F43G8VA relayA/C compressor relay
F44Not used (spare)
F455PCM run/start
F465PCM vehicle power 3 – general
powertrain components
F4715PCM vehicle power 1
F4815Mass air flow sensor
F4915PCM vehicle power 2 – emissions
related powertrain components
F50Full ISO relayCooling fan relay (high)
F51Full ISO relayBlower motor relay
F52Full ISO relayStarter relay
F53Full ISO relayRear defroster relay
F54Full ISO relayFront wiper relay
F55Full ISO relayCooling fan relay (low)
F56High current relayFuel pump sensor (Shelby only)
F57Full ISO relayPCM relay
F58High current relayNot used (Spare)

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 2012 Mustang throttle body relearn procedure.

2012 Mustang Fuse Box Diagram for Smart Junction Box

2012 Mustang Passenger Compartment Fuse Box Diagram

2012 Mustang Passenger Compartment Fuse Box Diagram

Fuse NumberAmperageCircuits Protected
F130Driver rear window (convertible only)
F215ANot used (spare)
F315Accessory Protocol Interface Module (APIM
F430Passenger rear window
(convertible only)
F510Brake transmission shift interlock
F620Turn signals, Hazard flashers
F710Left low beam headlamp
F810Right low beam headlamp
F915Courtesy lamps
F1015Switch illumination
F1110Security module
F127.5Power mirrors
F135ANot used (spare)
F1410Center information display,
Electronic finish panel, GPS
F1510Climate control
F1615Not used (spare)
F1720Power door locks, Trunk release
F1820Not used (spare)
F1925Navigation amp/Audio amplifier
F2025Diagnostic connector
F2115Fog lamps
F2215Park lamps, License lamps
F2315High beam headlamps
F2510Demand lighting (battery saver),
Gauge pack, Visor vanity lamps
F2610Instrument Panel Cluster (IPC)
F2720Ignition switch feed
F285Audio Control Module (ACM)
F295Camera (run/start)
F305Temperature sensor motor
F3110Restraints control module (RCM)
F3210Reverse parking aid
F3310Not used (spare)
F345Electronic stability control
F3510Auxiliary body module (ABM) run/start
F365Passive anti-theft system (PATS)
F3710Not used (spare)
F3820Not used (spare)
F4020Not used (spare)
F4115Accessory delay (windows,
automatic dimming rear view
mirror [including microphone and
compass] and door switch III)
F4210Not used (spare)
F4310Heated seat relay coils
F4410Not used (spare)
F455Wiper relay and module, Blower
F467.5Passenger airbag deactivation
indicator (PADI), Occupant
classification sensor (OCS)
F4730A Circuit BreakerNot used (spare)
F48RelayAccessory delay relay (windows,
automatic dimming rear view
mirror [including microphone and
compass] and door switch III)

Tips to diagnose electrical issues on your 2012 Mustang

If your power windows don’t work
• Ford uses a 30A circuit fuse for each window.

The fuse for the driver’s side power window is Fuse #34 30A PDB, and the fuse for the passenger side window is Fuse #29 30A PDB.

If your blower motor doesn’t work
The blower motor gets its power from the blower motor relay ##51 in the 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


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