Fuses and relays Mercedes A-Class (W168; 1997 - 2004)

The first generation of the A-Class was introduced in the fall of 1997. Mercedes W168 was a very unusual model in the company's lineup: in addition to an unusually short body, it was equipped with front-wheel drive. Another feature was the system of frontal impact absorption (the so-called "sandwich"). In this article we will understand in detail fuse box diagrams Mercedes A-Class W168 (1st Gen; A140, A150, A160, A170, A180, A190, A200 and A210) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 years of manufacture.

General view of the car
Here you will find the locations and photos of the mounting blocks. Also, we will separately mark the fuses responsible for the cigarette lighter and the fuel pump.

In the passenger compartment

Here there are two units responsible for the protection of the vehicle's electrical circuits.

Primary fuse box

Location of the main fuse box in the passenger compartment
Located on the front passenger side under the cover in the footwell.

General view of the Mercedes A-Class W168 fuse box.

No. Description A
1 fuel tank vent valve 20,
10 diesel
fan relay
fuel injection control unit
idle speed control unit
EGR valve
lambda probe heater 1
lambda probe heater 2
diagnostic connector
relay and boost valve. USA models
fuel shutoff valve
  fan relay diesel power control unit 10 (diesel)
diaphragm valve
throttle valve
EGR valve
catalyst temperature sensor
2 ignition coil engine control unit 25 (diesel)
fuel injectors
fuel pump fuse
electronic accelerator
starter blocking and shutdown relay
3 radiator blower [with air conditioner] 30, 40
4 engine control module 7.5
5 automatic clutch 40
6 fuel pump relay 30
7 vehicle lighting module 40
8 starter blocking and shutdown relay 30
9 cleaner motor 40
10 electric sunroof 40
  rear window wiper 20
11 paddle switch: 15
- window cleaner
- horn (beep)
- washer pump
- radio navigator
- cigarette lighter fuse mercedes w168
12 socket in the trunk radio, glove compartment light, CD changer 30
13 front window elevator 30
  power windows on all doors 7.5
14 instrument panel (clock) purifier and washer relay [mobile phone] 10
15 safety airbag unit 10
child seat recognition unit
[side airbag sensor]
16 exterior mirror drive and mirror heater [parking assist] 15
17 horn (beep) 15
18 instrument panel 10
Transponder and remote control signal receiver
electronic engine control unit relay
19 coupling device 30
20 15
21 15
22 audio system 25
23 No  
24 No  
25 No  
26 No  
27 No  
28 instrument panel 10
[power windows]
29 central locking system 15
seat position recognition unit
30 transponder and signal receiver from the remote control 7.5
electronic instrument panel
31 heated rear window 25
32 [mobile phone] 15
[radio receiver or radio navigation system]
[CD changer]
interior lamps
33 power windows 30
34 fuel filter heater or supercharger. U.S. models 30/40
35 [alarm control unit] 10
light and sound signaling relays
36 heated front seats 25
37 [program selector] 10
coolant heater relay
38 air conditioning compressor 10
air mixing flap motor
cabin air temperature sensor
washer fluid heater
39 lighting module 7.5
tail light
40 stop lamps 10
41 air conditioning compressor, diagnostic connector 10
42 window elevators 30
43 ESP brake light switch 15
44 transmission control unit or automatic clutch 10
45 interior heater or [air conditioner] fan 30
46 onboard network 80
47 power steering pump 60
48 preheating control unit. 60
Diesel vehicles
No. Relay assignment
K7 Mercedes W168 fuel pump relay  
K8 fuel system control unit and ignition relay ESP / VGS or ESP / automatic transmission.  
K9 VGS = transmission control unit  
K10 rear window heating  

Additional fuse box

Location of the additional fuse box in the passenger compartment
Located near the headlight switches on the side of the dashboard.

No. Appointment A
1 Left headlight - dipped beam 7.5
2 Right headlight - dipped beam 7.5
3 Headlamp-high beam, headlamp high beam indicator 15
4 Front left parking light/rear left parking light bulbs 7.5
5 Front/rear parking lamps (right), license plate illumination lamps, instrument panel illumination lamps 15
6 Fog lights 15

In the engine compartment

The location of the relay box in the engine compartment of the car
The block with relay modules is located on the right side under the plastic cover. To access its elements, unscrew the three fixing screws, press the clips and remove the cover.

Access example.

No. Description
1 Windshield washer pump
2 Horn (beep)
3 Prohibiting the activation of brake lights
4 Start prohibition relay
5 cooling fan
6 ABS / ESP pump
7 Exhaust air system pump (gasoline)

All electrical equipment

General layout of electrical equipment in mercedes w168.
1. Air conditioner control module in the heater control panel;
2. Antenna signal amplifier;
3. Anti-theft system control module - interior light bulbs;
4. Vehicle tilt sensor (anti-theft system) - in the anti-theft system control unit;
5. Anti-theft system horn;
6. Volume change sensors (anti-theft system) - in the anti-theft system control unit;
7. Anti-theft system signal control unit - in the immobilizer control unit;
9. Receiver for remote control of the auxiliary heater;
10. Passenger-side footwell battery pack;
12. Clutch actuator control module;
13. Diagnostic connector (DLC);
14. Power window control module in the front window control panel;
15. Left front power window control module - in the power window motor;
16. Left rear window control module - in the power window motor;
17. Right front window control module - in the power window motor;
18. Right rear window control module - in the power window motor;
19. Dashboard fuse box;
20. Main fuse/relay box, footwell;
21. Relay box, engine compartment;
22. Horn - behind front bumper;
23. Immobilizer control unit;
24. Immobilizer ring antenna - near ignition switch;
26. Lighting control module-in the headlight switch;
27. Multifunction control unit-Functions: Central locking, turn indicators, sunroof-in the instrument cluster;
28. Navigation system control unit-in the audio system unit;
29. Air temperature sensor;
30. Parktronic control unit;
31. Rain sensor - in the inside rear view mirror;
32. Seat heating control unit - in the switch unit;
33. left Side impact sensor,;
34. right side impact sensor;
35. SRS module;
36. Telephone network connection module;
37. Telephone interface control unit;
39. Intermittent windshield wiper relay - windshield wiper motor.

Related fuse diagrams
Be the first to comment. Nobody responded to this post yet.
Add new comment