Home > DIY > M-Class > W163 (1997-2005) > 1998-2005 Benz ML320 ML350 ML500 Fuse Box Location Diagram
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1998-2005 Benz ML320 ML350 ML500 Fuse Box Location Diagram

Are you trying to find the fuse box location on your Mercedes-Benz M-Class W163? In this guide, you will learn how to access the fuse box panel; see a copy of the fuse layout diagram and the fuse assignment.

Where is the fuse box panel located on a Mercedes-Benz on an ML320, ML350, ML430, or ML500?

  • The main fuse box is located in the engine compartment, driver’s side.
  • The auxiliary fuse box is inside the cabin, in the passenger’s foot well.

Fuse Guide Applications

Model: ML 320 ML 350 ML 430 ML 500 ML 55 AMG
Years: 1998 1999 2000 2001 2002 2003 2004 2005
Chassis: W163
Make: Mercedes-Benz

Main fuse box in the engine bay

Mercedes Benz W163 Fuse box location

The main fuse box is located in the engine bay. It is on the left (driver’s) side of the engine. Pull the two tabs toward the front, and lift the fuse panel cover.

w163 fuse box 1998 1999 2000 2001 2002 2003 2004 2005

Fuses in the engine bay ML Class 1998-2002 W163

Fuse # Purpose, Designation, Function Ampere
1 12-volt outlet socket 15
2 Left turn signal lamps 7.5
3 Right main headlight, headlamp 7.5
4 Sunroof, moon roof motor 20/40
5 Left bean headlamp, headlight 7.5
6 Lift gate wiper motor 7.5
7 wiper and washer system, front 30
8 Transfer case box 25
9 Instrument and license plate illumination 7.5
10 Anti dazzle mirror, vanity mirror, emergency call, RADIO, glove light 10
11 Fuel injection valves, engine functions 15
12 Parking lamp left 7.5
13 Steering angle sensor, footwell plus ceiling lights, onboard diagnosis 10
14 Engine control unit, diesel, fuel injection system 25
15 Brake stop lamps, brake light switch 10
16 Airbag control unit, SRS, A/C Air Conditioner system, gear selector module, instrument cluster 15
17 12-volt outlet on the passenger side, rear 20
18 Trailer socket, battery positive 25
19 Oxygen sensor, scavenging valve, fuel tank ventilation, vacuum pump, engine functions 15
20 Mirror heater 15
21 Sound system, radio, telephone, sound amplifier 25
22 Traction control, transmission, steering angle sensor, diagnosis, ML55 suction fan, rain sensor, onboard computer, ETC, gear recognition, reverse, and park lock, transfer case control unit, ESP, fuel pump relay, engine electronics ME 15
23 Dynamic headlamp range adjustment 15
24 parking lamp, right 7.5
25 Turn signal lamp, a right, trailer hitch, turn signal lamp 7.5
26 ignition coils 15
27 ABS hydraulic unit, traction control 40
28 heated seats 20
29 Power Window Switch. front left/rear right 30
30 Power Window Switch, front right/rear left 30
31 Switches, quarter window, mirror adjust, mirror lamps, rear vent window, outside mirror adjustment 15
32 Right Front, Seat adjustment switch, motor 30
33 Front Right, seat adjustment switch, motor 30
34 dipped beam headlamp left/headlight assembly range adjustment, left low beam, left headlamp 15
35 Low beam right (passenger side), Right front headlight unit. 15
36 Window heater, rear 30
37 Horn 20
38 Fuel pump,  Fuel level sensor 20
39 not used
40 vacuum pump for the engine 20
41 Recirculation pump, heater, Relay, coolant circulation pump, blower motor 25
42 Central locking door lock / unlock, keyfob remote 20
43 Heater fan, Blower motor 30
44 A/C, rear window washer pump, fan, air conditioner, engine fan stage 1, additional fan. 30
45 Air injection reactor pump, electrical air pump 40
46 Rear for lamp bulb 7.5
47 Fog lamps, front, High Beam light 15
48 Alarm signal, horn

Relays in engine compartment, ML320, ML350, ML500 ML55 AMG

w163 fuse box 1998 1999 2000 2001 2002 2003 2004 2005

Relay Function
K1 Heated outside mirror relay
K2 Horn
K3 Fuel pump
K4 Turn signal lamp, left
K5 Instrument cluster, license plate lights
K6 ESP Brake stop lamp suppression
K7 Turn signal lamp, right
K8 starter, solenoid switch, KI 50 relay
K9 Parking lamp, right
K10 Not used
K11 Terminal 15, voltage supply for diesel
K12 circuit 15 relay
K13 Parking lamp left
K14 comfort convenience relay
K15 Central locking for doors, tailgate
K16 Power windows right
K17 Windshield wiper blades, interval
K18 Power window left
K19 Heater, recirculation pump, e-box fan
K20 Central door locking system, all doors, tailgate, fuel tank
K21 Fan Heater
K22 Dipped beam headlamp, contact piece, daytime driving light relay
K23 Central door locking system, passenger door, rear doors
K24 Central door locking, driver’s door, fuel tank filler cap
K25 ABS Hydraulic Unit
K26 Fan air conditioning system
K27 rear window washer pump
K28 Air injection reactor pump
K29 Rear fog lamp
K30 Fog headlamp / AUX
K31 alarm horn

The auxiliary fuse box is located inside the cabin, in the passenger’s footwell.

ML fuse box location interior dash

A second fuse box is located in the passenger footwell. This is the auxiliary fuse box. To access the fuses inside, you must twist the two plastic locks and pull the cover towards the back of the engine.

Interor cabin fuse box panel

Fuses in the auxiliary panel. 

Fuse Purpose Ampere
1 Instrument cluster, Airbag indicator 7.5
2 Cigarette outlet, lighter 20
3 Rear window wiper 15
4 E Call emergency call system, TeleAid 7.5
5 Instrument Cluster 7.5
6 Cockpit socket 12-volt outlet 20
7 not used
8 Heated seats 20
9 not used
10 Power seat adjustment left 30
11 Power seat adjustment, right 30
12 not used
13 electric fuel pump 20
17 Heated rear window 25
19 Headlamp cleaning system 30
26 Circuit 15 70

Relays are located in the fuse and relay box by the passenger’s foot well.

W163 side dash fuses

Relay Purpose, Function
K1 Seat comfort relay
K2 electric fuel pump
K4 Heated rear window
K5 Headlamp cleaning system
K9 Circuit 15

What type of fuse do I need to replace blown fuse on my Mercedes-Benz?

fuse amere ratingWhen 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 for the blown fuse and the new fuse match. This indicates the same ampere rating.

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.

What is the importance of knowing the fuse box locations of your Mercedes-Benz?

  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, checking the fuses and replacing any blown ones regularly is important. 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.


What is the Best Scanner for Diagnosing Tripped Fuses and Broken Relays on a Mercedes-Benz?

The YOUCANIC full-system diagnostic scanner is a smart tool that helps uncover the mysteries of a car’s electronic systems. It’s a go-to for tackling tricky electrical problems, perfect for car experts and enthusiasts. If you’re dealing with a tripped fuse, this scanner quickly spots where things went wrong and helps you get things back on track.

Overall, the YOUCANIC full system diagnostic scanner is invaluable for any Mercedes-Benz owner or technician looking to troubleshoot problems quickly and accurately. With its user-friendly interface and powerful diagnostic capabilities, you can save time, money, and frustration by diagnosing and resolving issues with your Mercedes-Benz quickly and efficiently.


  1. I have a 2003 ML350 and the alarm just started going off for no reason yesterday, whenever the key was not inserted and turned to at least the 2 position. I changed the remote batteries after pulling fuse F48 and relay K31. I then replaced the fuses, but the remote no longer works.

  2. hey there i have a 2003 ml350 W163, i have my BAS ABS and ETS lights on so i thought id check the relays and fuses but i don’t have a K25 Relay and there’s nothing listed there i do have the abs unit all i have is a F27 40 Amp fuse.

  3. Hello. Thank you for such an informative article. I have a ml350 w 163. The issue is that when you turn on the parking lamp, the bulb does not light up. So when you are driving at night, there is no light until you puch on the brake. I have checked all the fuses under the hood (F25/F1/F15/F24/F12) as well as the physical bulbs that are in the parking lamp socket, which are all working. I am convinced there was some sort of short specifically in that socket where the pocket lamp is. Would you have any suggestions please?

    • Yes it is very likely that you have a short. I would check for shorts and continuity at the rear tail lights. Also make sure there is no accidental contact between the tail light circuit and any metal parts. Get a multimeter and start testing back there. Compare both sides because it is most likely it is just one of the tail lights that is causing the problem.

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