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

The first generation of the A-Class was introduced in autumn 1997. The Mercedes W168 has become 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 frontal impact absorption system (the so-called "sandwich"). In this material, we will analyze in detail the Mercedes fuse circuits in the back of the W168 1st generation A-class ( A140, A150, A160, A170, A180, A190, A200 and A210) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 release.

General view of the car
Here you will find the locations and diagrams of the fuse blocks. Separately, we note the elements responsible for the cigarette lighter and fuel pump.

In the passenger compartment

Location of the main fuse box in the passenger compartment
The main fuse box is located on the front passenger side under a cover in the footwell.

Location of the additional fuse box in the passenger compartment
An additional block is located near the headlight switches on the side of the dashboard.


General view of the main block.

Main compartment fuse box diagram
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
[tempomat]
relay and boost valve. USA models
fuel cutoff 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 car lighting module 40
8 starter blocking and shutdown relay 30
9 cleaner motor 40
10 electric sunroof 40
  rear window wiper 20
11 steering column switch: 15
- glass cleaner
- sound signal
- washer pump
- radio navigator
- cigarette lighter fuse mercedes w168
12 socket in the trunk radio, glove compartment light, CD changer 30
13 front door window lifter 30
  windows for all doors 7.5
14 instrument panel (clock) purifier and washer relay [mobile phone] 10
15 airbag unit 10
child seat recognition unit
[side airbag sensor]
16 exterior mirror drive and mirror heater [parking assist] 15
17 horn 15
18 dashboard 10
transponder and remote control signal receiver
electronic engine control unit relay
19 towing hitch 30
20 15
21 15
22 audio system 25
23 No  
24 No  
25 No  
26 No  
27 No  
28 dashboard 10
[windows]
29 central locking 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 window lifters 30
34 fuel filter heater or (supercharged US models 30/40
35 [burglar alarm control unit] 10
2x relays of light and sound signaling
36 heated front seats 25
37 [program selector] 10
coolant heater relay
38 air conditioning compressor 10
air mixing flap motor
interior air temperature sensor
washer jet heater
39 lighting module 7.5
reversing light
40 brake lights 10
41 air conditioning compressor, diagnostic connector 10
42 window lifters 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 = 6nok gearbox control  
K10 heated rear window  
Additional block diagram
No. Appointment A
1 Left headlight - low beam 7.5
2 Right headlight - low beam 7.5
3 Headlamp-high beam, headlamp high beam indicator 15
4 Front Left / Rear Left Lamps 7.5
5 Front / rear rightparking lights, license plate lights, dashboard lights 15
6 Fog lights and lights 15

In the engine compartment

The location of the relay box in the engine compartment of the car
The relay module box is located on the right side under a plastic cover. To access its elements, it is necessary to unscrew the three fastening screws, squeeze the latches and remove the cover.


Access example.

Diagram
No. Description
1 Windshield washer pump
2 Horn
3 Prohibition of inclusion of stoplights
4 Start inhibit relay
5 cooling fan
6 ABS / ESP pump
7 Exhaust air pump (petrol)
General layout of electrical equipment Mercedes w168
No. Component
1 Air conditioner control module - in the heater control panel
2 Antenna Signal Booster
3 Anti-theft control module - interior lamps
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 alarm control unit - in the immobilizer control unit
9 Additional heater remote control receiver
10 Battery legroom, passenger side
12 Clutch control module
13 Diagnostic connector (DLC)
14 Power window control module - in the front power window control panel
15 Left front power window control module - in the power window motor
16 Rear left power window control module - in the power window motor
17 Right front power window control module - in the power window motor
18 Rear Right Power Window Control Module - in the power window motor
19 Fuse box
20 Main fuse / relay box, footwell
21 Relay box, engine compartment
22 Horn - behind the front bumper
23 immobilizer control unit
24 Immobilizer ring antenna - near the ignition switch
26 Lighting control module-in head light switch
27 Multifunctional control unit - functions: central locking, direction indicators, sunroof - in the instrument cluster
28 Navigation control unit - in audio unit
29 Air temperature sensor
30 Parktronic control unit
31 Rain sensor - inside rearview mirror
32 Seat heating control unit - in switch block
33 left side impact sensor
34 right side impact sensor
35 SRS module
36 Telephone connection module
37 Telephone interface control unit
39 Relay for intermittent operation of the windshield wiper - windshield wiper motor
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