The Mercedes W140 is an S-Class model of the German brand Mercedes Benz, which was produced in 1991, 1992, 1993, 1994, 1995, 1996, 1997 and 1998. During this time, she underwent restyling. In this publication you will find a description of the fuses and relays Mercedes 140 with box diagrams and their locations. Select the fuse responsible for the cigarette lighter.
The execution of the boxes and the purpose of the elements in them may differ from those presented and depend on the year of manufacture and the level of equipment of your Mercedes 140. Check the information provided with your diagrams.
Example diagram from the box cover
Engine compartment
Fuse and relay box
The main fuse and relay box is located on the left side next to the rack and is covered with a protective cover.
Diagram
Assignment
| 1 | Not connected |
| 2 | 30A Auxiliary air conditioning fan relay |
| 3 | 30A Wiper Motor (09/95) |
| 4 | 40A Wiper Motor (08/95) |
| 5 | 40A Rear mounting block pre-fuse (in luggage compartment) |
| 6 | 40A Heated rear window (except Coupé) – before 1995, from 09/95 AIR air pump, DRL daytime driving light |
| 7 | 10A Before 1992 headlight lens cleaners / since 1993 not connected |
| 8 | 7.5A Left parking light, Right tail light, Left side light |
| 9 | 7.5/15A Right parking light, Right tail light, License plate light, Headlight lens cleaners, Exterior light switch (since 1993), Diode engine boost matrix (since 1996), Instrument panel (since 1994), Cigarette lighter |
| 10 | 7.5A Rear fog lamp |
| 11 | 7.5A Dipped beam left headlight |
| 12 | 7.5A Dipped beam right headlight |
| 13 | 7.5A High beam left headlight / high beam warning lamp |
| 14 | 7.5A High beam right headlight / high beam warning lamp |
| 15 | 15A SRS Airbag Warning Light, Wiper Relay, Combination Relay, High Beam Switch, Washer Fluid Pump, Heated Rear Window Switch, Rain Sensor (from 09/1995), Seat Belt Adjustment, Vanity Mirrors |
| 16 | 10A Cigarette Lighter, Glove Light, Starter Interlock Relay Module (since 1994) |
| 17 | 20A Ignition cut-off relay, Radio receiver (up to 08/1995), after – steering column angle sensor, Non-proprietary reader connector, DLC diagnostic connector, Diagnostic module (OBD II), Instrument cluster, Vanity mirror light, Turn signal, Hazard switch alarms, interior lighting |
| 18 | 15A A/C, Auxiliary Fan Relay Module |
| 19 | 7.5A DRL Daylight, Spark Plugs, Pre-Channel Off Timer Relay Module, Base Module, Seat Belt Warning Lamp (from 09/1995) |
| 20 | 10A A/C Push Button Control Module, A/C Compressor, Kickdown Switch, Purge Control Valve |
| 21 | 20A Windshield washer jets, Heated power mirrors, Transmission oil cooler, A/C control unit |
| 22 | 7.5A to 0.8/1995: Ignition/Start Switch, Audio System, Seat Belt Warning Lamp Module, Safety Position Correction, Combination Relay, Heated Front Seats, Heated Rear Seats, From 09/1995: Not Connected |
| 23 | 7.5A Injectors, Instrument Cluster, Thermostat Switch, Ignition/Start Switch, Pre-Glow/Start Switch, Stop Lamp Switch, Upper Center Stop Lamp |
| 24 | 7.5A Auto day/night mirror, Base unit, Purge control valve, Instrument cluster, Exterior lamp monitoring module, Interior lighting, Electronic air injection control pump clutch (603 engine), Stop light switch switch , Seat belt warning module , DRL daytime running light, Engine control module (HFM-SFI engines) |
| 25 | 15A Turn Signal Interrupter/Alarm Relay, Fan Relay Module, Starter/Reverse Light Circuit Open Switch, Reverse Lights, Shift Solenoid Valves (AT) |
| 26 | 10A Fog lights |
| 27 | Not connected |
| 28 | 7.5A Automatic antenna |
| 29 | 15A Heated front seat control module |
| 30 | 20A Left and right seat position memory, driver’s memory of ergonomic parameters: Steering column adjustment, Rear-view mirror adjustment, Electronic steering column adjustment system |
| 31 | 30A Bench type rear seat power, Rear left power seat, Rear head restraint |
| 32 | 7.5/30A Right rear power seat, rear headrest (Coupe) |
| 33 | Not connected |
| 34 | 7.5A Heated front seat control module, Heated rear window, Relay module (Coupe), Seat belt extension |
| 35 | 7.5A/15A Rear window sunshade, Comfort system |
| 36 | 10A A/C push button control module |
| 37 | 30A Power seat front left |
| 38 | 30A Power seat front left |
| 39 | Not connected |
| 40 | 30A Right front seat power |
| 41 | 30A Right front seat power |
Fuse number 16 is responsible for the front cigarette lighter. And for the rear one, the fuse is in the box in the trunk.
Relay
Diagram
Designation
- R1 – Combined relay (windshield wipers, heated rear window, warning lights and tow hitch)
- R2 – Reserve
- R3 – Starter lock relay
- R4 – Horn relay (signal)
- R5 – High pressure switch / return pump
- R6 – Comfort equipment relay
- R7 – Headlight cleaner relay
Additional box
It is located on the right side under the hood, also closed with a protective cover.
There may be additional elements responsible for:
- ESP/speed-sensitive power steering control module)
- Traction Control Module (ASR)
- Front seat heating control module (under the right rear seat, – do not confuse with the rear seat heating control module, – check on the wiring harness)
- Transmission Control Module (TCM)
- Engine control module (ECM ME-SFI)
and other elements.
Luggage compartment
In the luggage compartment, on the right, behind the trim, there is another box with fuses and relays.
Diagram
Allocation
| 1 | 15A Rear A/C |
| 2 | 7.5A Anti-theft alarm control module ATA, Infrared single lock control module IRCL, Starter lock relay module (1993), Heated rear seat control module |
| 3 | 20A Rear Cigarette Lighter, Single Lock, PSE Control Module, Door Closer |
| 4 | 7.5A Rear vanity mirror (up to 1994) |
| 5 | 30A Power windows |
| 6 | 30A Power windows |
| 7 | 7.5/20A Rear vanity mirror light (up to 08/1995), Seat belt extender control module (Coupé) |
| 8 | 20A Rear cigarette lighter |
| 9 | 30A Door Closer |
| 10 | 7.5A Cell phone |
| 11 | 20A Power Window Control Module, Luggage Compartment Light, Rear Interior Light, Rear Reading Light, Rear Door Opener Light, Pneumatic Equipment (PSE) Control Module, Internal Central Lock Switch |
| 12 | 20A Heated rear seat control module |
| 13 | 30A Fuel pump relay module |
| 14 | 25A Sunroof panel electric |
| 15 | 25A Anti-theft alarm control module ATA, Infrared single lock control module IRCL, Rear head restraints |
| 16 | 30A Tuner amplifier, Audio system amplifier, Radio receiver |
| 17 | Rear window heating |
Two relays can be installed side by side. The left one is the fuel pump relay and the right one is the heated rear window relay.
Above the fuse box are installed: the comfort equipment control module, and next to it the anti-theft system control module (not to be confused with the driver identification anti-theft control module, which is located under the instrument cluster on the steering column support bracket)).
That’s all. If you know how to make the material better – write in the comments.
Hi,
Just connected battery and the Hazard lights and wipers won’t turn off.
Possible relay R1 in above diagram?
Thanks
Tengo problemas con el elevalunas de la parte del conductor no para el motor pueden decirme cual es el relay
Unfortunately I make short-cut and dashboard lights ,vents lights,sunroof lights,windows lights, seat adjustment light Doesn’t work Anymore!
I check all the fuses, seems to be OK!
Mb w140 S320
Thanks!