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.
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
Primary fuse box
Located on the front passenger side under a cover in the footwell.
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 fuse box
An additional block is located near the headlight switches on the side of the dashboard.
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 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 arrangement
Location of electrical equipment.
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