Fuses and relays Mercedes GLA (X156, 2013 - 2020)

This material discusses in detail the fuse diagrams of a Mercedes GLA car (first generation / factory index X156):  2013, 2014, 2015, 2016, 2017, 2018, 2019 and 2020  with the designations GLA 180, GLA 200, GLA 220, GLA 250, GLA 45 AMG.

Fuses numbered 70, 71 and 72 in the cabin block are responsible for protecting the electrical circuits of the cigarette lighters.

In the underhood compartment


The mounting block is located on the left side of the engine compartment. 


It consists of two sections.

Diagram
No. Description Amps
Section 1
F1
  • Generator 300A
  • type 242.890: 400A DC voltage converter control unit
300 / 400
F2 Fuse box in passenger compartment (gasoline) 200
Interior Fuse Block (Diesel) 250
F3 Power steering control unit 100
F4 SAM control unit 40
F5 Fan motor 80
F6 engine 607: fuel heating control unit 70
F7 engine 607: DPF regeneration auxiliary heater control unit 125
F8 engines: 651, 607: Glow plug output stage module 100
F32k1 Decoupling relay -
Section 2
J Horn relay
K Wiper speed relay 1/2
L Wiper relay on/off
M
  • Relay terminal 87C (type 242.890)
  • Starter terminal 50 relay
N Relay terminal 87M
O
  • Relay terminal 87 parking lock control unit (type 242.890)
  • Transmission oil coolant circulation pump relay
P spare relay
Q
  • Power supply relay for brake booster vacuum pump (type 242.890)
  • Terminal 15 relay (unprotected)
R Relay terminal 15
S Relay terminal 87
T Heated windshield relay
201 alarm siren 5
202 Auxiliary heater control unit 20
type 242.890: Relay terminal 87 parking lock control unit 5
203 Front right headlight 15
Transmission control unit (type 242.890) 5
204 Control unit for electronic motion stabilization system 25
205 Horn (left and right) 15
206
  • engine 651: CDI control unit
  • Type 242.890: Transmission control unit, El. circuit terminal 87M, brake booster vacuum pump relay
5
207
  • Type 242.890: HV battery cooling shut-off valve, Parking lock control unit
  • diesel: Relay el. circuit terminals 87M
5
208 Terminal 87 relay (motors: 133, 607) 7.5
Fan motor (type 242.890) 5
209 Front left headlight 15
Reserve (type 242.890) -
210 Heated front window relay 5
type 176 from 09/01/2015, type 246 from 11/03/2014: Starter pre-relay -
211 CNG control unit (type 242.848) 7.5
Heating circuit circulation pump (type 242.890) 15
212 motors 133, 270: cable lug electr. circuit terminals 87M3 ( ) 15
Engine 651: EGR cooler bypass changeover valve, Ventilation pipe heater, Coolant thermostat heater
607 engine: CDI control unit, Boost pressure control servo, Lambda probe before catalytic converter 
Type 242.890: Electric drive and charger coolant pump
213
  • type 242.890: Coolant pump 1 for battery cooling,
  • motors 133, 270, 651: Terminal 87 cable termination
  • engine 607: Camshaft Hall sensor, Lambda probe after catalytic converter, CDI control unit, Metering valve
15
214 motors 133, 270, 651: Terminal 87 cable termination 10
Type 242.890: Coolant pump 2 for battery cooling 15
215
  • petrol engines: Ignition coils of cylinders 1/2/3/4;
  • engine 607: CDI control unit, Metering valve, Boost pressure control servo;
  • engine 651: Dosing valve
20
Type 242.890: Transmission Gateway Control Unit, Thermal Management Unit 5
type 242.890 as of 11/03/2014: High-voltage power distributor 5
216 engine 607: Transmission control unit / petrol engines: ME control unit 5
217 724 gearbox: Control unit for fully integrated dual clutch gearbox control system 25
218 Control unit for electronic motion stabilization system 5
219 type 242.890: Parking lock control unit 5
220 724 gearbox: Circulation pump of the gearbox oil cooling system 10
221 type 242.890: Vacuum pump 40
222 type 242.890: Electric air conditioner compressor 7.5
223 Spare  
224 COLLISION PREVENTION ASSIST control module, DISTRONIC electrical control module 7.5
225 Type 242.890: Transmission control unit 5
226
  • type 242.848: CNG control unit
  • Type 242.890: Power Electronics Control Unit and Charger Control Unit
5
227 Type 242.890: Power electronics control module 5
228 Type 242.890: Electric vehicle sound generator 5
229 Front left headlight 5
230 Control unit for electronic motion stabilization system 5
231 Front right headlight 5
232 headlight control module 15
233 Spare -
234 607 engine: Transmission control module   5
type 242.890: High voltage power distributor 10
235
  • Engine 607: Fan Motor, Radiator Shutter Actuator
  • engine 133: charge air cooler circulation pump
7.5
236 SAM management module 40
237 Electronic motion stabilization control module 40
238 Heated windshield 50
239 Wiper Mode Relay 1/2 30
240A Starter terminal 50 relay 25
Type 242.890: Transmission control unit 7.5
240B without support: Relay terminal 15 25
241 type 242.890: High voltage electric heater system 7.5

In the cabin


The fuse box is located behind the floor trim at the foot of the front passenger.


Access example.

Diagram
No. Relay
A terminal 15
B rear window wiper
C terminal 15R2
D rear window heating
E terminal 15R1
F terminal 30g
G terminal 87 parking lock control motor (type 242.890)
No. Fuses Amps
21 Additional electric heater (models with a diesel engine) 150
22 Additional battery relay for ECO Start-Stop function 200
23 front left door control 30
24 front right door control 30
25 SAM control unit 30
26 Additional battery cable termination for “ECO Start-Stop” function 10
27 fuses and relays in the engine compartment 30
28
  • Thermal management unit (type 242.890)
  • Cabin sound generator control unit (type 176 with engine 651)
5
29 Trailer detection control unit (from 03.11.2014) / Trailer socket (up to 02.11.2014) 15
30 Trailer detection control module 5
31 AWD control module 5
32 Signals from the steering control unit 5
33 Audio / COMAND system control panel 5
34 Climate Control Panel 7.5
35 type 117, 176, 242, 246: Heated rear window 40
type 156: Heated rear window 30
36 Lumbar support adjustment control unit for driver's seat, Driver's seat control unit 7.5
37 Audio module / COMAND system display 7.5
38 Control unit for passenger restraint system (Supplemental Restraint System) 7.5
39 Ceiling Control Panel 10
40 engine 651: Transmission control module 15
Type 242.890: Transmission control module 5
41 Panoramic sliding sunroof control module 30
42 Audio module, COMAND control module 5
Audio module 25
43 Parking assistance control unit 5
44 Reversible front left seat belt pretensioner 40
45 Reversible front right seat belt pretensioner 40
46 Lumbar support adjustment control unit for front passenger seat, Front passenger seat control unit 7.5
47 Holder Control Unit for iPhone, Navigation Module 7.5
Control unit for adaptive damping system 25
48 Not used -
49 Drive Kit Control Unit for iPhone 7.5
COMAND fan motor 5
50 Camera Cover Control Unit 5
51 Not used -
52 Parking lock actuator signal 30
53 Not used -
54 Not used -
55 KEYLESS-GO System, Telecommunication Services Communication Module 5
56 Signals from the steering column electronic module control unit 10
57 Multifunction control unit for special vehicle 30
7.5
Terminal 87 relay Park lock actuator 5
58 Special Vehicle Fuse Box 30
59 Front passenger seat control unit 30
60 Driver's seat control unit 30
61 Audio system amplifier 40
62 Electric steering lock control unit (gearbox 711) 20
63 Fuel pump control unit 25
Transmission interface control unit (type 242.890) 5
64 Control unit “Electronic Toll Collection” -
DSRC Toll Communication Control Unit -
65 Glove box light 5
66 Special Vehicle Fuse Box 15
Special vehicle interface 5
67 Not used -
68 Not used -
69 Not used -
70 Cigarette lighter socket in the center console in the rear 25
71 Cigarette lighter socket in trunk 25
72 Front cigarette lighter socket with ashtray illumination 25
73 Electric parking brake control unit 30
74 30
75 Trailer detection control unit 20
Battery management system control unit (type 242.890) 5
76 Trailer recognition control module 25
Parking lock control unit (type 242.890) 5
77 Trailer recognition control module 25
78 Trunk Lid/Tailgate Control Unit 40
Special Vehicle Fuse Box 40
79 SAM management module 40
80 SAM management module 40
81 Fan controller 40
82 Ceiling Control Panel 10
83 Electronic ignition lock control module 7.5
84 Upper block control panel 5
85 EDW / Tow Protection / Interior Monitor Control Module 5
86
  • Antenna amplifier / mobile communication compensator (from 06/01/2016)
  • Antenna amplifier FM, AM and ZV
5
87 Diagnostic connector 10
88 instrument cluster 10
89 Outdoor lighting switch 5
90 Intelligent radar sensor in rear bumper left and right 5
91
  • Footwell Light Switch, Pedal Sensor
  • Battery management module (type 242.890)
5
92 Fuel pump fuse 5
type 242.890: Transmission interface control unit 5
93 Electric parking brake control module 5
94 Passenger Restraint System (SRS) Control Module 7.5
95 Weight Sensing System Control Module, Occupancy Detection and AKSE, Front Passenger Seat 7.5
96 Tailgate wiper motor 15
97 Mobile phone electrical plug 5
98 SAM control unit 5
99 Tire pressure monitoring control unit 5
100 DIRECT SELECT interface (engine 133) 5
101 All-wheel drive control unit 10
102 Remote radio remote control receiver for auxiliary heater 5
Type 242.890: Transmission control unit
AMG, from 01.09.2015: Drive mode control unit
as of 06/01/2016: Antenna switch for telephone and auxiliary heater
103 HERMES Control Unit, Emergency Call System Control Unit, Telecommunication Services Communication Module 5
104 Media Connectivity Module, Media Interface Control Unit 5
105 Satellite Digital Audio Radio (SDAR) Control Unit, Digital Audio Broadcasting Control Unit 5
tuner module 7.5
106 Multifunction camera 5
107 Digital TV tuner 5
108 Rear View Camera 5
as of 06/01/2016: Rear view camera 7.5
109 Electrical plug connection socket outlet for cargo 20
110 Motorsound control unit, COMAND control module, Audio module 30
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