Mercedes-Benz 124 – a series of light-duty business class cars produced in 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996 with both diesel and petrol engines with various options body styles (sedan, station wagon, coupe, cabriolet). During this time, the model has been restyling 2 times. In this publication you will find a description of the fuses and relays Mercedes 124 with box diagrams, their locations and photo examples of their performance. Select the cigarette lighter fuse.
Contents
Fuse and relay box
Under the hood, the main fuse and relay box is located on the left side of the engine compartment and consists of two sections (fuses and relays).
Photo – example
Check the actual designation of the elements with your diagram on the roof of the unit, as it may differ from the one shown and depends on the year of manufacture, equipment level and region of delivery of your car.
An example of a circuit from the block cover
Diagram
Assignment
| 1 | 16A Glove box lamp |
| Cigarette lighter | |
| Heated rear window button | |
| Rear window wiper and washer | |
| Radio | |
| Orthopedic backrest (124 545: 1500, 1600, 2100, 2200, 2700) | |
| Electric headrests (124 545: 0700, 0900, 1500, 2100, 2200) | |
| Seat belt supply system (124 545 2700) | |
| 2 | 16AF Windshield wiper and washer |
| Headlight cleaning relay (Kl. 86) | |
| High Beam Alarm Circuit | |
| Convenience system supply relay (Kl. 86) | |
| Power window relay (Kl. 86) (124 545: 0700, 0900, 1300, 1600, 2200, 2500) | |
| 3 | 8A Right side light |
| Headlamp cleaners (124 545: 0600, 0700, 0900) | |
| License plate lighting | |
| Illumination of the instrument cluster | |
| Heater control lamps | |
| Warning buzzer (124 545: 0600, 1000, 1200, 1500, 2100, 2500, 2700) | |
| 4 | 8A Front fog lights |
| Rear fog lamp | |
| 5 | 8A Stop lamps |
| instrument cluster | |
| Front dome light | |
| Signaling device of malfunction of lamps of external illumination | |
| Cruise control | |
| Tachometer | |
| Trailer control unit (124 545: 1200, 1500, 2100, 2700) | |
| Roof control unit (124 545 2700) | |
| Roof control button (124 545 2700) | |
| 6 | 8A Direction indicators |
| Sound signal | |
| Outdoor temperature sensor | |
| On-board computer (123 545 1500) | |
| Roof control unit (124 545 2700; DE: Ausloesegeraet Ueberrollbuegel) | |
| 7 | 8/16A Reversing lamps |
| heater valve | |
| Water pump | |
| Engine cooling fan | |
| Heated windshield washer jets | |
| climate control unit | |
| Additional fan relay (Kl. 86) | |
| Automatic transmission control unit | |
| Heater fan internal sensor | |
| Air conditioning compressor | |
| Ignition valve switch off (124 545: 0600, 1000, 1200, 1500, 2100) | |
| 8 | 8A Left position light |
| 9 | 8A Alarm |
| Diagnostic connector | |
| Clock | |
| Front dome light | |
| Radio | |
| Convenience system supply relay (Kl. 86) | |
| Sun visor mirror lamps | |
| 10 | 25A Heated rear window |
| 11 | 8A 124 545: 0600, 1000, 1200, 1500: Carburetor electronics |
| 124 545: 1200, 1300, 1500, 2100: Transmission oil cooler | |
| 124 545 2100: Intake manifold heater | |
| 16A 124 545 2500: Alarm | |
| 12 | 25A 124 545: 0600, 0700, 1000, 1200, 2100: Heater motor |
| 16A 124 545 2500: Alarm | |
| 13 | 8A Left low beam |
| 14 | 8A Right low beam |
| 15 | 8A Left high beam |
| 16A 124 545 2500: | |
| Left high beam | |
| Additional high beam (left) | |
| 16 | 8A Right high beam |
| High Beam Indicator | |
| 16A 124 545 2500: | |
| Right high beam | |
| High Beam Indicator | |
| Additional high beam (right) | |
| A | 16A Hatch |
| Orthopedic backrest (124 545: 0600, 0700, 0900, 1000, 1200, 1300) | |
| Heated front seats (124 545: 0600, 0700, 0900, 1000, 1200, 1300) | |
| Electric headrests (124 545: 0600, 1000, 1200) | |
| 25A 124 545 1500: Power windows | |
| 8A 124 545 2700: Roof control unit | |
| B | 8A Power mirrors |
| Heated mirrors | |
| Heated rear seat (rear heater) (124 545: 0600, 1000, 1200, 2100) | |
| Seat Belt Delivery System (124 545: 1200, 1300, 1500, 1600, 2100, 2200, 2700) | |
| Electric rear window blind (124 545: 1200, 1300, 1500, 1600, 2100, 2200, 2500) | |
| C | 16A Rear dome light |
| trunk lighting | |
| Rear door lock | |
| Central door locking system | |
| Plafonds in the doors | |
| Automatic antenna | |
| Seat adjustment motor with memory | |
| Trailer direction indicator control unit (124 545: 0600, 0700, 0900) | |
| Seat Belt Delivery System (124 545: 1200, 1300, 1500, 1600, 2100, 2200, 2700) | |
| Lumbar support (124 545: 1200, 1300, 1500, 1600, 2100, 2200, 2700) | |
| Rear reading light (124 545: 0600, 1200, 1300, 1500, 1600, 2100, 2200, 2500) | |
| CD changer | |
| Amplifier | |
| D | 16A Additional fan |
| E | 25A Front seat adjustments |
| Adjustable steering column (memory) (except 124 545: 0700, 0900) | |
| F | 25A Front seat adjustments |
| Adjustable steering column (except 124 545: 0700, 0900, 2500) | |
| G | 16A 124 545: 0600, 0700, 0900, 1000: Power windows (front left, rear right) |
| 124 545: 1200, 1300: Power windows (front left, rear right) | |
| 25A 124 545: 1500, 1600, 2100, 2200, 2500, 2700: Power windows (front left, front right) | |
| H | 16A 124 545: 0600, 0700, 0900, 1000: Power windows (front right, rear left) |
| 25A 124 545: 1200, 1300: Power windows (front right, rear left) | |
| 124 545: 1500, 1600, 2100, 2200, 2500, 2700: Power windows (rear left, rear right) | |
| Relay | |
| A | Power Window, Sunroof, Power Seat Relay |
| Power seats | |
| B | Air conditioning condenser fan |
| C | air conditioner condenser fan) |
| D | headlamp cleaner |
| E | Fuse connector |
| Oxygen sensor relay | |
| F | Seat heating relay |
| Power windows | |
| Comfort system power relay (since 1990) | |
| G | Seat belt warning |
| Fuel return valve relay | |
| H | Combination relay: turn signals, alarm, rear window defroster, wiper motor, anti-theft system |
| I | Power seat diode (since 1990) |
| Power window diode | |
| Parking Brake/ASR/Electronic Accelerator (since 1992, 400E/500E) | |
| K | Lamp Health Check System Unit |
In parentheses is the circuit number of the fuse box, which is located on the cover. (example: 124 545 2200)
The number 1 fuse is responsible for the cigarette lighter.
Relay box
An additional box with a relay can be installed under the hood on the right side.
Diagram
Designation
- Fuel pump relay
- Surge protection relay for injection and ABS electronics
- Air conditioning compressor control unit
Additional elements
Fuel pump relay (K27)
Location
Appointment
- 11 – except 124.034, 124.036
- 12 – under the rear seat (models; 124.034 (E420), 124.036 (E500))
- N6 – Air conditioning compressor control unit
- N30 – ABS control unit
Starter Interlock Relay (K38)
Other elements
Diagram
Decoding
- K11/1 – Left headrest relay
- K11/2 – Right headrest relay
- K12 / 1 – Intermittent rear wiper timer
- N13 – Engine overload protection relay / cruise control
- N14 – Glow plug relay
- N28 – Trailer control unit
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There is something to add – write in the comments.
Hello. Just bought a M Benz CE 230. The windows do not work. Also the sunroof does sometimes. I have switched the fuses. What else can be the probleme?
I have a E250 D, 124, 1997 model.
The car engine suddenly cut off while driving.
There is no fuel coming to the engine.
Q1) does the car have a electric fuel pump? As earlier when ignition switch was turned on, there was a distinct sound of a pump starting.
I have a 1990 Mercedes 200 from Europe and the dashboard lights do not work. Any ideas on what I can do?
Could someone please send me a complete wiring diagram of fuel pump relay, fuel pump and the Klima and the OVP relay of the W124 E220 since they are all situated on the front passenger side of car?
I believe someone by passed the fuel pump relay by mixing up the wiring or there has been a break in continuity of the wiring to power the pump. Thank you.
Hi my dash lights and console lights don’t work anymore on my 1995 E320 W124 … any help on which fuse it is ? Thanks
Km reset rod is a dimmer rheostat. Turn clockwise. If not working pull out instrument cluster and check the soldering of relay legs, maybe one broken. Or there is 1 fuse inside the cluster back, maybe blown
Hello
I have merc124 250D, 1993.
Today I have trouble with front wiper. Only when I press water pump wiper start but even then I should handle in specific position.
I can’t put on 0 is always on position 1..
Not working on 1 or 2 speed / Or he deside himself to change speed.
I one moment inside we notice kind of electric burn smell.
Wiper motor, power windows, seat switches all went out, suspect at the same time.
Fuses appear ok…. should I be trouble shooting with Relay A or multiple relays?