Fuse Relays M-Class W166 2012-Present Mercedes-Benz ML 250 350 400 550 63 GLE AMG

Trying to find the fuse box location on your Mercedes-Benz? Whether looking for the cigarette, lighter, radio, COMAND, or Navigation fuse location, you will find all of them here.

Location of the fuse box panels on Mercedes-Benz?

• Engine Bay Fuse Box (Passenger Side)
• Engine Bay prefuse Box ( Engine bay, by the hood hinge, pass. side)
• Fuse box in the interior of the vehicle. Side of the dash on the pass. side.
• Prefuse box under the passenger seat.
• Rear fuse box by the rear seat.
• Fuse box for battery protection. By rear battery in the trunk, passenger side.

Fuse Types Used on Mercedes-Benz

The ATO and MAXI fuses are installed on the fuse box panels. All these fuses can be purchased on Amazon; links are provided below. They are inexpensive when purchased online.

• ATO Automotive Blade Type Fuse
• Maxi Fuses

Fuse Guide Applications

Model:	ML350 ML400 ML550 ML63 AMG ML250 Diesel
Years:	2012 2013 2014 2015 2016
Chassis:	W166, GLE
Make:	Mercedes-Benz

Interior Fuse Box -Dashboard, Passenger Side

The interior fuse box is located on the side of the dash. You will find the fuse box if you look at the passenger side of the dash. A plastic cover can easily be removed. Use a Dash Trim Removal Tool to avoid damaging the dashboard.

Fuses located in the dashboard.

Fuse	Location, Purpose, Designation	Ampere
10	Ignition Lock	7.5
11	Steering column	10
12	Instrument cluster	5
13	Blower fan air conditioner	15
14	Connector	5
15	Upper control panel	5
16-18	not used	–
19	Air Conditioner	15
20	Steering column	5
21	Audio / Radio / COMAND /Stereo	5
22	not used	–

Fuse and relay box under the rear seat

To access this fuse box, you must fold the rear passenger seat forward. Under the seat, you will see a box with relays and fuses inside. To access the fuses, press the tabs on the front of the box and lift the panel cover. List of fuses under the rear seat. Here you will find fuses F100 to F157.

Fuse	Function, Purpose, Designation	Ampere
100	Radio, COMAND, Navigation, Stereo DVD, Nav	5
101	Trailer Hitch	20
102	Driver Seat Controls	7.5
103	Passenger Seat Control	7.5
104	Telephone/Antenna Amplifier	5
105	Navigation	5
106	Liftgate	5
107-109	Not used	–
110	AdBlue for diesel engines	5
111	Trailer Hitch Connection	15
112	Fuel Electronics	5
113	Parking brake	5
114	Exterior lights	5
115	Trailer hitch	5
116	Districts Plus, Blind Spot Assist, Active Lane Keeping SENSORS	5
117	Night View Assist	5
118	Not used	–
119	Transfer Case	5
120	Fuel Sensor	5
121-123	Not Used	–
124	Brake Control Connector	30
125	Not used	–
126	Trailer Hitch	15
127	Driver seat Controls	30
128	Trailer Recognition	20
129	Passenger Seat Controls	30
130	Trailer Recognition	20
131	Not Used	–
132	Fuel System	25
133	Stationary Heater	5
134	Seat occupancy Sensor, child sensor, front passenger	5
135	The light bulb glove compartment	5
136	SRS, Airbag	7.5
137	Camera, Toll Conection	15
138	Anti-roll system, car stabilization	15
139	Not used	–
140	AdBlue System for Diesel Vehicles	7.5
141	AdBlue System for Diesel Vehicles	15
142	AdBlue System for Diesel Vehicles	20
143	Not used	–
144	Not used	–
145	Cup Holder / Temperature	7.5
146	Rear window heater	30
147	Radio / Comand / Audio / Navigation	30
148	Cigarette Lighter / Output	15
149	Not used	–
150	Outlet 12-volt back/trunk/cargo area	20
151	Outlet back seat, socket 12 volt	20
152	Control Unit N10/8	30
153	115 Volt Outlet fuse – AC Converter	25
154	Rear liftgate	40
F157	Circuit 15R1	15

Relays under the rear seat

Relay	Purpose
A	Power Outlet
B	Rear window heater relay
C	Backup
E	Circuit 15
F	Rear window wiper
G	Circuit 15R1
H	Not used
I	Backup

Engine Compartment Fuse Box

A fuse and relay box are located in the engine bay on the passenger side. To access this panel, open the hood and look on the left side of the engine. You will see the fuse box right behind the headlight. Remove the fuse cover by pressing on the locking tabs. Here you will find fuses F201 to F241.

Fuse	Purpose, Function, Designation	Ampere
201	Not used
202	Stationary Heater	20
203	Alarm, Antitheft System	5
204	ESP	25
205	Horn	15
206-212	Not used	–
213	Engine Electronics	7.5
214	Engine Electronics	15
215	Radiator Actuator, Connector	15
216	Engine Compartment Electrical, Engine Mount	15
217	Electrical Connector	20
218	Not Used	–
219	PAir cooler pump	10
220-228	Not used	–
229	Left headlight	7.5
230	ESP Electronic Stability Program	5
231	Right headlamp	7.5
232	Tranmission control unit	15
233	Bi-xenon headlight lamp, intelligent light	15
234	DISTRONIC, Active Blind	5
235	Wipers	20
236	Not used	–
237	Intelligent module, Direct Select	30
238	AIRMatic Air Suspension, Adaptive Damping System	40
239	Windshield wiper motor	30
240	Starter Motor	30

Resources and useful links

Here is a list of useful resources related to the fuses and relays on the Mercedes-Benz M-Class W166 and GLE. These are external links.

• Fusebox and relay details
• Fuse charts that come with the car 
• Fuse diagram of the W166 /GLE, pictures
• Owner’s Manual for W166 M-Class.pdf

What fuse type do I need to replace a blown fuse?

Your Mercedes-Benz uses Automotive Blade Fuse Type. A box of 100 fuses that include all the different ampere ratings you need costs less than $20 on Amazon.

• When replacing blown fuses, use the same ampere rating fuse. The fuse rating is written on the fuse. You can verify that you are using the correct fuse by ensuring the fuse colors match the blown fuse and the new fuse. This indicates the same ampere rating.
• Make sure to close the fuse box cover properly and lock the tabs. This is very important to avoid any moisture getting inside the fuse box. The fuse box panel has a seal to keep water and moisture out of the box.

What is the importance of knowing where the fuse box is?

1. Electrical troubleshooting: When a vehicle has an electrical problem, such as a malfunctioning radio or a non-functioning turn signal, the fuse box is the first place to check. By knowing the location of the fuse box, the driver or technician can quickly check the fuses related to the malfunctioning electrical component.
2. Preventing damage: Fuses protect the electrical components of a vehicle from damage caused by power surges or overloads. By knowing the location of the fuse box, the driver can quickly replace a blown fuse and prevent further damage to the vehicle’s electrical system.
3. Safety: In some cases, a blown fuse can cause a safety hazard. For example, if the fuse for the brake lights is blown, other drivers may not be able to see when the vehicle is stopping. Knowing the location of the fuse box and the function of each fuse can help prevent accidents and ensure the safety of the vehicle’s occupants and other drivers on the road.
4. Maintenance: To maintain a vehicle’s electrical system, it is important to check the fuses and replace any that are blown regularly. Knowing the location of the fuse box and how to access it can make this process quicker and easier.

Overall, knowing the location and function of the fuse box is important for maintaining a vehicle’s electrical system and ensuring the safety of its occupants and others on the road.