2012-2018 Mercedes A-Class W176 Fuse Box Diagram

A-Class
W168 (1997–2004)
W169 (2004–2012)
W176 (2012–present)
1997-2004 Mercedes A-Class W168 fuse diagram
Mercedes W169 fuse box diagram (A-Class; 2004–2012)
Mercedes A-Class W176 fuse diagram (2012-present)
If you manipulate or bridge a faulty fuse or if you replace it with a fuse with a higher amperage, the electric cables could be overloaded. This could result in a fire. There is a risk of an accident and injury.
Always replace faulty fuses with the specified new fuses having the correct amperage.

Fuse box in the engine compartment

2012-2018 Mercedes A-Class W176 Fuse Box Diagram
  • Open the bonnet.
  • Remove any existing moisture from the fuse box using a dry cloth.
  • To open: open clamps (2).
  • Fold cover (1) up in the direction of the arrow and remove it.
2012-2018 Mercedes A-Class W176 Fuse Box Diagram
  • To close: check whether the seal is lying correctly in cover (1).
  • Insert cover (1) at the back into openings (3) on the fuse box.
  • Fold down cover (1).
  • Hook clamps (3) into the fuse box and close.
  • Close the bonnet.
2012-2018 Mercedes A-Class W176 Fuse Box Diagram



No.
Fused function
A
201 Alarm siren
5
202 Stationary heater control unit
20
203 LED headlamp: Right front lamp unit
15
204 Electronic Stability Program control unit
25
205 Left fanfare horn
Right fanfare horn
15
206 Valid for engine 651: CDI control unit
Valid for engine 607: Powertrain control unit
5
207 Valid for diesel engine: Circuit relay87M
5
208 Valid for engine 133, 607: Circuit 87 relay
7.5
209 LED headlamp: Left front lamp unit 15
210 Heated windshield relay
as of 01.09.2015: Starter front-end relay
5
211 Not used
-
212 Valid for engine 133, 270: Connector sleeve, circuit 87M3
Valid for engine 651:
   Vent line heater element
   Coolant thermostat heating element
   Exhaust gas recirculation cooler bypass switchover valve
Valid for engine 607 (Emissions standard EU5):
   Oxygen sensor upstream of catalytic converter
   Boost pressure positioner
Valid for engine 607 (Emissions standard EU6): Oxygen sensor upstream of catalytic converter
Valid for engine 607: CDI control unit
15
213 Valid for engine 133, 270, 651: Connector sleeve, circuit 87 M2e
Valid for engine 607 (Emissions standard EU5):
   Camshaft Hall sensor
   CDI control unit
   Quantity control valve
Valid for engine 607 (Emissions standard EU6):
   Oxygen sensor downstream of catalytic converter
   CDI control unit
15
214 Valid for engine 133, 270, 651: Connector sleeve, circuit 87 M4e 10
215 Valid for gasoline engine:
   Cylinder 1 ignition coil
   Cylinder 2 ignition coil
   Cylinder 3 ignition coil
   Cylinder 4 ignition coil
Valid for engine 651: Quantity control valve
Valid for engine 607:
   CDI control unit
   Boost pressure positioner
   Quantity control valve
20
216 Valid for gasoline engine: ME-SFI control unit
Valid for engine 607: Powertrain control unit
5
217 Valid with transmission 724: Dual clutch transmission fully integrated transmission control unit
25
218 Electronic Stability Program control unit
5
219 Not used
-
220 Transmission cooling coolant circulation pump 10
221 Not used -
222 Not used -
223 Not used
-
224 DISTRONIC electric controller unit
COLLISION PREVENTION ASSIST controller unit
7.5
225 Not used
-
226 Not used
-
227 Not used
-
228 Not used -
229 Left front lamp unit
5
230 Electronic Stability Program control unit
5
231 Right front lamp unit
5
232 Headlamp control unit
15
233 Not used -
234 Valid for engine 607: Powertrain control unit
5
235 Valid for engine 607:
   Fan motor
   Radiator shutters actuator
7.5
Valid for engine 133:
  
Charge air cooler circulation pump
   Charge air cooler circulation pump
7.5
236 SAM control unit
40
237 Electronic Stability Program control unit
40
238 Heated windshield
50
239 Wiper speed 1/2 relay
30
240A Starter circuit 50 relay
25
240B Circuit 15 relay (not latched) 25
241 Not used
7.5
Relay
J Fanfare horn relay
K Wiper speed 1/2 relay
L Windshield wiper ON/OFF relay
M Starter circuit 50 relay
N Circuit relay87M
O ECO start/stop: Transmission cooling coolant circulation pump relay
P Backup relay (F58kP)
Q Circuit 15 relay (not latched)
R Circuit 15 relay
S Circuit 87 relay
T Heated windshield relay

Fuse box in the front-passenger foot-well

2012-2018 Mercedes A-Class W176 Fuse Box Diagram
  • To open: open the front-passenger door.
  • Remove the floormats.
  • Fold out perforated floor covering (1) in the direction of the arrow.
2012-2018 Mercedes A-Class W176 Fuse Box Diagram
  • To release cover (3), press retaining clamp (2).
  • Fold out cover (3) in the direction of the arrow to the catch.
  • Remove cover (3) forwards.
    Fuse allocation chart (4) is located on the lower right-hand side of cover (3).
  • To close: insert cover (3) on the left-hand side of the fuse box into the retainer.
    Cover (3) engages in the retainers.
  • Fold down cover (3) until clamps (2) lock audibly.
  • Fold back perforated floor covering (1).
  • Fit the floormats.
2012-2018 Mercedes A-Class W176 Fuse Box Diagram



No.
Fused function
A
21 Valid for diesel engine: PTC heater booster
150
22 Additional battery relay for ECO start/stop function
200
23 Left front door control unit 30
24 Right front door control unit 30
25 SAM control unit
30
26 ECO start/stop additional battery connector sleeve
10
27 Engine compartment fuse and relay module
30
28 Vehicle interior sound generator control unit
5
29 up to 02.11.2014: Trailer socket
as of 03.11.2014: Trailer recognition control unit
15
30 Trailer recognition control unit 5
31 4MATIC: All-wheel drive control unit
5
32 Steering column tube module control unit
5
33 Audio/COMAND control panel
5
34 ACC control and operating unit 7,5
35 Rear window heater
40
36 Driver seat control unit
Driver seat lumbar support adjustment control unit
7,5
37 Audio/COMAND display
7,5
38 Supplemental Restraint System control unit
7,5
39 Overhead control panel control unit
10
40 Valid for engine 651 (Emissions standard EU6): Powertrain control unit
15
41 Panoramic sliding sunroof control module
30
42 Radio (Audio 5 USB, Audio 20 CD, Audio 20 CD with CD changer)
COMAND controller unit
5
Radio (Radio 20, Audio 20 USB) 25
43 Parking system control unit
5
44 Left front reversible emergency tensioning retractor
40
45 Right front reversible emergency tensioning retractor
40
46 Front passenger seat control unit
Front passenger seat lumbar support adjustment control unit
7,5
47 Navigation module
iPhone® cradle control unit
7,5
Adaptive damping system control unit 25
48 Not used -
49 Control unit for Drive Kit for iPhone® 7,5
COMAND fan motor
5
50 Camera cover control unit
5
51 Not used -
52 Not used
-
53 Not used -
54 Not used -
55 Telematics services communications module
KEYLESS-GO control unit
5
56 Steering column tube module control unit 10
57 Lane Keeping Assist: Special-purpose vehicle multifunction control unit 30
Special vehicle: Special-purpose vehicle multifunction control unit 7.5
58 Emergency vehicle fuse box
30
59 Front passenger seat control uni 30
60 Driver seat control unit 30
61 Sound system amplifier control unit 40
62 Valid for transmission 711: Electric steering lock control unit
20
63 Fuel system control unit
25
64 Electronic Toll Collection control unit
Dedicated Short-Range Communications control unit
1
65 Glove compartment lamp
5
66 Emergency vehicle fuse box
15
67 Not used -
68 Not used -
69 Not used -
70 Rear center console socket
25
71 Luggage compartment socket
25
72 Front cigarette lighter with ashtray illumination
Vehicle interior power outlet 
25
73 Electric parking brake control unit
30
74 Electric parking brake control unit 30
75 Trailer recognition control unit
20
76 Trailer recognition control unit
25
77 Trailer recognition control unit
25
78 Emergency vehicle fuse box
40
79 SAM control unit
40
80 SAM control unit
40
81 Blower regulator
40
82 Overhead control panel control unit
10
83 Electronic ignition lock control unit
7,5
84 Upper control panel control unit
5
85 ATA [EDW]/tow-away protection/interior protection control unit
5
86 FM, AM and CL [ZV] antenna amplifier
as of 01.06.2016: Cellular telephone system antenna amplifier / compensator
5
87 Diagnostic connector
10
88 Instrument cluster
10
89 Exterior lights switch
5
90 Left rear bumper intelligent radar sensor
Intelligent radar sensor for right rear bumper
5
91 Pedal operation monitor switch
Footwell illumination switch
5
92 Fuel system control unit
5
93 Electric parking brake control unit
5
94 Supplemental Restraint System control unit 7,5
95 Front passenger seat occupied recognition and ACSR
Weight sensing system (WSS) control unit
7,5
96 Tailgate wiper motor
15
97 Mobile phone electrical connector
5
98 SAM control unit
5
99 Tire pressure monitor control unit
5
100 Valid for engine 133: DIRECT SELECT INTERFACE
5
101 4MATIC: All-wheel drive control unit
10
102 Stationary heater radio remote control receiver
Valid for AMG vehicles as of 01.09.2015: Transmission mode control unit
as of 01.06.2016: Antenna changeover switch for telephone and stationary heater
5
103 Emergency call system control unit
Telematics services communications module
HERMES control unit
5
104 Media interface control unit
Multimedia connection unit
5
105 Digital Audio Broadcasting control unit
Satellite digital audio radio (SDAR) control unit
5
Tuner unit
7,5
106 Multifunction camera
5
107 Digital TV tuner
5
108 up to 31.05.2016: Reversing camera
5
as of 01.06.2016: Reversing camera
7,5
109 Charging socket electrical connector
20
110 Radio
COMAND controller unit
Engine sound control unit
30
Relay
A Circuit 15 relay
B Rear window wiper relay
C Circuit 15R2 relay
D Heated rear window relay
E Circuit 15R1 relay
F Circuit 30g relay
G Not used



Front electrical prefuse box

2012-2018 Mercedes A-Class W176 Fuse Box Diagram2012-2018 Mercedes A-Class W176 Fuse Box Diagram
No.
Fused function
A
1 Alternator
300
2 Vehicle interior fuse box 200
Valid for diesel engine: Vehicle interior fuse box
250
3 Electrical power steering control unit 100
4 SAM control unit
40
5 Fan motor
80
6 Valid for engine 607: Fuel preheating control unit
70
7 Valid for engine 607 (Emissions standard EU5): DPF regeneration heater booster control unit
125
8 Valid for engine 607, 651: Glow output stage
100
Relay
F32k1 Decoupling relay