2021 FORD Mustang Fuses and Fuse Box User Guide

2021 FORD Mustang Fuses and Fuse Box User Guide

The 2021 FORD Mustang fuses and fuse box are covered in this Guide, including their locations, functions, and replacement. Understanding these crucial components ensures your Mustang’s electrical systems work.

2024 Ford Mustang Specs, Price, Features, Mileage (Brochure)

Video: 2021 FORD Mustang Fuses

FUSE BOX LOCATIONS

Engine Compartment Fuse Box
The power distribution box is in the engine compartment. It has high-current fuses that protect your vehicle’s main electrical systems from overloads.

If you disconnect and reconnect the battery, you need to reset some features.

Passenger Compartment Fuse Box
The fuse box is in the passenger compartment under the dashboard. You may need to remove a trim panel to access the box.

FUSE SPECIFICATION CHART

Engine Compartment Fuse Box
WARNING: Always disconnect the battery before servicing high current fuses.

WARNING: To reduce risk of electrical shock, always replace the cover to the power distribution box before reconnecting the battery or refilling fluid reservoirs.

The engine compartment fuse box is in the engine compartment. It has high-current fuses that protect your vehicle’s main electrical systems from overloads.

You need to reset some features when you, or someone else, disconnects and reconnects the battery.

Replace fuses with the same type and rating.

Fuse or Relay Number	Fuse Rating	Protected Component
1	60A1	Electronic fan 1 (GT500).
	—	Not used (base).
2	—	Not used.
3	30A1	Electronic fan 1 (base).
	—	Not used (GT500).
4	40A1	Electronic fan 3 (base).
	—	Not used (GT500).
5	50A1	Automatic brake system pump.
6	50A1	Body control module.
7	60A1	Body control module.
8	50A1	Body control module.
9	40A1	Rear window defroster.
10	40A1	Blower motor.
11	30A2	Left-hand front window.
12	30A2	Driver seat.
13	30A2	Passenger seat.
14	30A2	Climate controlled seat module.
15	20A2	Convertible top slave motor (base).
	—	Not used (GT500).
16	15A2	Charge air cooler pump (GT500).
	—	Not used (base).

Fuse or Relay Number	Fuse Rating	Protected Component
17	20A2	Convertible top master motor (base).
	—	Not used (GT500).
18	—	Not used.
19	20A3	Steering column lock relay (base).
	10A3	Transmission control unit (GT500).
20	10A3	Brake on-off switch.
21	20A3	Horn.
22	10A3	Powertrain control module relay.
23	10A3	Air conditioning clutch.
24	30A2	Voltage quality module.
25	20A2	Steering column lock relay (GT500).
	—	Not used (base).
26	25A2	Windshield wiper motor.
27	—	Not used.
28	30A2	Automatic brake system valve.
29	—	Not used.
30	30A2	Starter motor solenoid.
31	—	Not used.
32	10A3	Latch relay coil.
33	15A3	Run/start (base).
	20A3	Left-hand high-intensity discharge head- lamps (GT500).
34	15A3	Exhaust valves.

Fuse or Relay Number	Fuse Rating	Protected Component
35	20A3	Right-hand high-intensity discharge head- lamps (GT500).
	—	Not used (base).
36	10A3	Alternator sense.
37	—	Not used.
38	20A3	Vehicle power 1.
39	—	Not used.
40	20A3	Vehicle power 2.
41	15A3	Fuel injectors.
42	15A3	Vehicle power 3.
43	—	Not used.
44	15A3	Vehicle power 4 (base).
	30A3	Vehicle power 4 (GT500).
45	—	Not used.
46	20A2	Differential pump (Mach 1, GT500).
	—	Not used (base).
47	—	Not used.
48	30A2	Fuel pump #2 (GT500).
	—	Not used (base).
49	30A2	Fuel pump.
50	—	Steering column lock relay.
51	—	Not used.
52	—	Horn relay.
53	20A2	Cigar lighter.

Fuse or Relay Number	Fuse Rating	Protected Component
54	20A2	Auxiliary power point.
55	25A2	Electronic fan 2 (base).
	—	Not used (GT500).
56	—	Not used.
57	—	Air conditioning clutch relay.
58	—	Not used.
59	—	Exhaust valves relay.
60	5A3	Powertrain control module.
61	—	Not used.
62	5A3	Anti-lock brakes run/start switch.
63	—	Not used.
64	5A3	Electronic power assist steering.
65	—	Not used.
66	5A3	Blind spot information system. Rear view camera. Rear window defroster relay coils. Vehicle dynamics module.
67	—	Not used.
68	10A3	Headlamp leveling switch (base).
	10A3	Signature lighting (GT500).
69	—	Cigar lighter relay. Auxiliary power point relay.
74	5A3	Mass air flow sensor (base).
	—	Not used (GT500).
75	5A3	Rain sensor module (base).

Fuse or Relay Number	Fuse Rating	Protected Component
	—	Not used (GT500).
76	—	Rear window defroster relay.
77	—	Electronic cooling fan 2 relay (base).
	—	Not used (GT500).
78	—	Run/start relay (base).
	—	Not used (GT500).
79	—	Charge air cooler pump relay (GT500).
	—	Not used (base).
80	—	Windshield wiper relay.
81	—	Starter motor solenoid relay.
82	—	Powertrain control module relay.
83	—	Cooling fan relay (GT500).
	—	Not used (base).
87	10A3	Heated exterior mirrors.
88	—	Not used.
89	—	Electronic fan 1 relay (base).
	—	Not used (GT500).
90	—	Differential pump relay (Mach 1, GT500).
	—	Not used (base).
91	—	Electronic fan 3 relay (base).
	—	Not used (GT500).
92	—	Blower motor relay.
93	—	Fuel pump #2 relay (GT500).

Fuse or Relay Number	Fuse Rating	Protected Component
	—	Not used (base).
94	—	Fuel pump relay.

1. J-case fuses.
2. M-case fuses.
3. Micro fuses.

Note: Spare fuse amperage may vary.

Passenger Compartment Fuse Panel
The fuse panel is in the right-hand side of the passenger footwell behind a trim panel and plastic key code card.

To remove the trim panel, lift it from the rear retaining hooks, while pulling it toward you and swinging it away from the side. To reinstall it, line up the tabs with the grooves on the panel, drop the panel back into place, and then push it shut.

To reach the fuse panel, first remove the key code card.
After replacing a fuse, return the key code card to the original position. To reinstall the trim panel, lineup the tabs with the grooves on the panel, drop the panel back into place, and then push it shut to reinstall the trim panel.

Fuse or Relay Number	Fuse Rating	Protected Component
1	—	Not used.
2	10A	Power windows. Electrochromic mirror. Power door locks.
3	7.5A	Power mirrors (base). Memory seats (base).
	—	Not used (GT500).
4	20A	Not used (spare).
5	—	Not used.
6	10A	Not used (spare).
7	10A	Not used (spare).

Fuse or Relay Number	Fuse Rating	Protected Component
8	5A	Telematic control unit – modem.
9	5A	Not used.
10	—	Not used.
11	—	Not used.
12	7.5A	Electronic control panel. Gateway module. Gear shift module (GT500).
13	7.5A	Steering column control module. Instrument cluster.
14	15A	Not used.
15	15A	SYNC. Gauges.
16	—	Not used.
17	7.5A	Headlamp leveling switch (base).
	—	Not used (GT500).
18	7.5A	Not used.
19	5A	Not used.
20	5A	Intrusion sensor module.
21	5A	In-vehicle temperature and humidity sensor.
22	5A	Auxiliary body module.
23	30A	Amplifier.
24	30A	Vehicle dynamics module.
25	20A	Ambient lighting module (base). Auxiliary body module.
26	30A	Right-hand front-window motor (power distribution module). Passenger door control unit.
27	30A	Left-hand rear-window power (base).
	—	Not used (GT500).

Fuse or Relay Number	Fuse Rating	Protected Component
28	30A	Right-hand rear-window power (base).
	—	Not used (GT500).
29	15A	Gateway module (base). Not used (spare) (GT500).
30	5A	Not used (spare)
31	10A	Remote keyless entry.
32	20A	Audio unit.
33	—	Not used.
34	30A	Run/start bus.
35	5A	Power distribution box run/start relay (base).
	—	Not used (GT500).
36	15A	Front camera (base).
	—	Not used (GT500).
37	20A	Heated steering wheel module (base).
	—	Not used (GT500).

Note: Spare fuse amperage may vary.

CHANGING A FUSE

Fuses
WARNING: Always replace a fuse with one that has the specified amperage rating. Using a fuse with a higher amperage rating can cause severe wire damage and could start a fire.

If electrical components in the vehicle are not working, a fuse may have blown. Blown fuses are identified by a broken wire within the fuse. Check the appropriate fuses before replacing any electrical components.

Fuse Types

Callout	Fuse Type
A	Micro 2
B	Micro 3
C	Maxi
D	Mini
E	M Case
F	J Case
G	J Case Low Profile

Useful Links:

2024 Ford Mustang Specs, Price, Features, Mileage (Brochure)

2021 FORD Mustang Warning Lights and Indicators User Guide

Video: 2021 FORD Mustang Fuses