Mercedes-Benz GLA-Class Fuse Box Locations and Diagrams (2014-2020)

The Mercedes-Benz GLA (GLA-Class; X156), produced from 2014 to 2020, is a sporty luxury crossover that combines compact dimensions with dynamic performance and premium comfort. As Mercedes-Benz’s entry-level SUV, the GLA offers a high-riding stance, advanced safety features, and a powerful range of engines, making it an excellent choice for urban driving and weekend adventures.

In this article, you will find fuse box diagrams for the first-generation Mercedes-Benz GLA-Class, covering models GLA180, GLA200, GLA220, GLA250, and GLA45 AMG for the years 2014, 2015, 2016, 2017, 2018, 2019, and 2020. These diagrams provide crucial insights into the fuse layout, helping vehicle owners, mechanics, and technicians locate and understand the function of each fuse and relay.

What’s Included:

  • Fuse Box Diagrams – Clear and detailed visuals to help identify fuses, relays, and circuit breakers.
  • Fuse Panel Locations – Step-by-step guidance on where to find the fuse panels inside the Mercedes-Benz GLA-Class.
  • Fuse Assignments – Comprehensive descriptions of each fuse and relay function for accurate diagnostics and troubleshooting.

Whether you’re searching for the fuse panel layout, replacing a blown fuse, or diagnosing an electrical issue, this guide is an essential resource. It ensures that your Mercedes-Benz GLA-Class’s electrical system remains functional and reliable for daily commutes, highway cruising, and sporty driving experiences.

Keep your Mercedes-Benz GLA-Class (2014–2020) in top condition with this detailed fuse box, fuse panel, and relay guide!

  • The cigar lighter/power outlet fuses (all are located in the Passenger Compartment Fuse Box)in the Mercedes-Benz GLA are:
    • Fuse №70: Rear Center Console Socket
    • Fuse №71: Luggage Compartment Socket
    • Fuse №72: Front Cigarette Lighter, Interior Power Outlet

Passenger Compartment Fuse Box

Fuse box location

The fuse box is located in the front-passenger foot-well.

  1. Fold out perforated floor covering (1) in the direction of the arrow;
  2. To release cover (3), press retaining clamp (2);
  3. Fold out cover (3) in the direction of the arrow to the catch;
  4. Remove cover (3) forwards;
  5. Fuse allocation chart (4) is located on the lower right-hand side of cover (3).

Fuse box diagram

Interior fuse box diagram: Mercedes-Benz GLA-Class (2014-2019-..)

Assignment of the fuses and relay in the passenger compartment

№Fused functionAmp
21Valid for diesel engine: PTC heater booster150
22Additional battery relay for ECO start/stop function200
23Left front door control unit30
24Right front door control unit30
25SAM control unit30
26ECO start/stop additional battery connector sleeve10
27Engine compartment fuse and relay module30
28Vehicle interior sound generator control unit5
29up to 02.11.2014: Trailer socket
as of 03.11.2014: Trailer recognition control unit		15
30Trailer recognition control unit5
314MATIC: All-wheel drive control unit5
32Steering column tube module control unit5
33Audio/COMAND control panel5
34ACC control and operating unit7,5
35Rear window heater30
36Driver seat control unit
Driver seat lumbar support adjustment control unit		7,5
37Audio/COMAND display7,5
38Supplemental Restraint System control unit7,5
39Overhead control panel control unit10
40Valid for engine 651 (Emissions standard EU6): Powertrain control unit15
41Panoramic sliding sunroof control module30
42Radio (Audio 5 USB, Audio 20 CD, Audio 20 CD with CD changer) COMAND controller unit5
42Radio (Radio 20, Audio 20 USB)25
43Parking system control unit5
44Left front reversible emergency tensioning retractor40
45Right front reversible emergency tensioning retractor40
46Front passenger seat control unit
Front passenger seat lumbar support adjustment control unit		7,5
47Navigation module7,5
47Adaptive damping system control unit25
48Not used–
49Control unit for Drive Kit for iPhone®7,5
49COMAND fan motor5
50Camera cover control unit5
51Not used–
52Not used–
53Not used–
54Not used–
55Telematics services communications module
KEYLESS-GO control unit		5
56Steering column tube module control unit10
57Lane Keeping Assist: Special-purpose vehicle multifunction control unit30
57Special vehicle: Special-purpose vehicle multifunction control unit7.5
58Emergency vehicle fuse box30
59Front passenger seat control uni30
60Driver seat control unit30
61Sound system amplifier control unit40
62Valid for transmission 711: Electric steering lock control unit20
63Fuel system control unit25
64Electronic Toll Collection control unit
Dedicated Short-Range Communications control unit		1
65Glove compartment lamp5
66Emergency vehicle fuse box15
67Not used–
68Not used–
69Not used–
70Rear center console socket25
71Luggage compartment socket25
72Front cigarette lighter with ashtray illumination
Vehicle interior power outlet		25
73Electric parking brake control unit30
74Electric parking brake control unit30
75Trailer recognition control unit20
76Trailer recognition control unit25
77Trailer recognition control unit25
78Trunk lid/liftgate control control unit
Emergency vehicle fuse box		40
79SAM control unit40
80SAM control unit40
81Blower regulator40
82Overhead control panel control unit10
83Electronic ignition lock control unit7,5
84Upper control panel control unit5
85ATA [EDW]/tow-away protection/interior protection control unit5
86FM, AM and CL [ZV] antenna amplifier
as of 01.06.2016: Cellular telephone system antenna amplifier / compensator		5
87Diagnostic connector10
88Instrument cluster10
89Exterior lights switch5
90Left rear bumper intelligent radar sensor
Intelligent radar sensor for right rear bumper		5
91Pedal operation monitor switch
Footwell illumination switch		5
92Fuel system control unit5
93Electric parking brake control unit5
94Supplemental Restraint System control unit7,5
95Front passenger seat occupied recognition and ACSR
Weight sensing system (WSS) control unit		7,5
96Tailgate wiper motor15
97Mobile phone electrical connector5
98SAM control unit5
99Tire pressure monitor control unit5
100Valid for engine 133: DIRECT SELECT INTERFACE5
1014MATIC: All-wheel drive control unit10
102Stationary 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
103Emergency call system control unit
Telematics services communications module
HERMES control unit		5
104Media interface control unit
Multimedia connection unit		5
105Digital Audio Broadcasting control unit
Satellite digital audio radio (SDAR) control unit		5
105Tuner unit7,5
106Multifunction camera5
107Digital TV tuner5
108up to 31.05.2016: Reversing camera5
108as of 01.06.2016: Reversing camera7,5
109Charging socket electrical connector20
110Radio
COMAND controller unit
Engine sound control unit		30
Relay
ACircuit 15 relay
BRear window wiper relay
CCircuit 15R2 relay
DHeated rear window relay
ECircuit 15R1 relay
FCircuit 30g relay
GNot used

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Front Electrical Pre-Fuse Box

Fuse box diagram

Front Electrical Pre-Fuse Box

№Fused functionAmp
1Alternator300
2Vehicle interior fuse box200
2Valid for diesel engine: Vehicle interior fuse box250
3Electrical power steering control unit100
4SAM control unit40
5Fan motor80
6Valid for engine 607: Fuel preheating control unit70
7Valid for engine 607 (Emissions standard EU5):  DPF regeneration heater booster control unit 125
8Valid for engine 607, 651:  Glow output stage 100
Relay
F32klDecoupling relay

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Engine Compartment Fuse Box

Fuse box location

The location of the fuses in the passenger compartment: Mercedes-Benz GLA-Class (X156; 2014-2019..)

Fuse box diagram

Under-hood fuse box diagram: Mercedes-Benz GLA-Class (2014-2019-..)

Assignment of the fuses and relay in the engine compartment

№Fused functionAmp
201Alarm siren5
202Stationary heater control unit20
203LED headlamp: Right front lamp unit15
204Electronic Stability Program control unit25
205Left fanfare horn
Right fanfare horn		15
206Valid for engine 651: CDI control unit
Valid for engine 607: Powertrain control unit		5
207Valid for diesel engine: Circuit relay 87M5
208Valid for engine 133, 607: Circuit 87 relay7.5
209LED headlamp: Left front lamp unit15
210Heated windshield relay5
211Not used–
212Valid 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
213Valid 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
214Valid for engine 133, 270, 651: Connector sleeve, circuit 87 M4e10
215Valid 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
216Valid for gasoline engine: ME-SFI control unit
Valid for engine 607: Powertrain control unit		5
217Valid with transmission 724: Dual clutch transmission fully integrated transmission control unit25
218Electronic Stability Program control unit5
219Not used–
220Transmission cooling coolant circulation pump10
221Not used–
222Not used–
223Not used–
224DISTRONIC electric controller unit
COLLISION PREVENTION ASSIST controller unit		7.5
225Not used–
226Not used–
227Not used–
228Not used–
229Left front lamp unit5
230Electronic Stability Program control unit5
231Right front lamp unit5
232Headlamp control unit15
233Not used–
234Valid for engine 607: Powertrain control unit5
235Valid for engine 607:
Fan motor
Radiator shutters actuator		7.5
235Valid for engine 133:
Charge air cooler circulation pump
Charge air cooler circulation pump		7.5
236SAM control unit40
237Electronic Stability Program control unit40
238Heated windshield50
239Wiper speed 1/2 relay30
240AStarter circuit 50 relay25
240BCircuit 15 relay (not latched)25
241Not used7.5
Relay
JFanfare horn relay
KWiper speed 1/2 relay
LWindshield wiper ON/OFF relay
MStarter circuit 50 relay
NCircuit relay 87M
OECO start/stop: Transmission cooling coolant circulation pump relay
PBackup relay (F58kP)
QCircuit 15 relay (not latched)
RCircuit 15 relay
SCircuit 87 relay
THeated windshield relay

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