Mercedes-Benz 124 fuse and relay

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.

Mercedes 124

Fuse and relay box

location 1

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

photo

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

fuse designation 124

Diagram

Diagram

Assignment

 

116A 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)
216AF 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)
38A 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)
48A Front fog lights
Rear fog lamp
58A 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)
68A Direction indicators
Sound signal
Outdoor temperature sensor
On-board computer (123 545 1500)
Roof control unit (124 545 2700; DE: Ausloesegeraet Ueberrollbuegel)
78/16A 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)
88A Left position light
98A Alarm
Diagnostic connector
Clock
Front dome light
Radio
Convenience system supply relay (Kl. 86)
Sun visor mirror lamps
1025A Heated rear window
118A 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
1225A 124 545: 0600, 0700, 1000, 1200, 2100: Heater motor
16A 124 545 2500: Alarm
138A Left low beam
148A Right low beam
158A Left high beam
16A 124 545 2500:
Left high beam
Additional high beam (left)
168A Right high beam
High Beam Indicator
16A 124 545 2500:
Right high beam
High Beam Indicator
Additional high beam (right)
A16A 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
B8A 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)
C16A 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
D16A Additional fan
E25A Front seat adjustments
Adjustable steering column (memory) (except 124 545: 0700, 0900)
F25A Front seat adjustments
Adjustable steering column (except 124 545: 0700, 0900, 2500)
G16A 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)
H16A 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
APower Window, Sunroof, Power Seat Relay
Power seats
BAir conditioning condenser fan
Cair conditioner condenser fan)
Dheadlamp cleaner
EFuse connector
Oxygen sensor relay
FSeat heating relay
Power windows
Comfort system power relay (since 1990)
GSeat belt warning
Fuel return valve relay
HCombination relay: turn signals, alarm, rear window defroster, wiper motor, anti-theft system
IPower seat diode (since 1990)
Power window diode
Parking Brake/ASR/Electronic Accelerator (since 1992, 400E/500E)
KLamp 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

Relay diagram

Designation

  1. Fuel pump relay
  2. Surge protection relay for injection and ABS electronics
  3. Air conditioning compressor control unit

Additional elements

Fuel pump relay (K27)

Location

Relay K27

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)

Relay k38

Other elements

Diagram

Other elements MB 124

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

We also posted a video on our YouTube channel. Look and subscribe.

There is something to add – write in the comments.

Comments 1

  • 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?

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