Table of Contents
The Mercedes-Benz GLA-Class is a subcompact luxury crossover SUV produced by the German automaker since December 2013 in Europe. It debuted at the 2013 Frankfurt Motor Show. This guide provides detailed fuse box diagrams and relay assignments for first-generation Mercedes-Benz GLA models (chassis code X156) produced for model years 2013 through 2020 (GLA 180, GLA 200, GLA 220, GLA 250, and GLA 45 AMG).
Below are the locations, diagrams, and photographic references for the power distribution centers. Fuses for the “Cigarette Lighter” and “Fuel Pump” are highlighted in bold.
Engine Compartment Fuse Box
The main power distribution box is located on the left side of the engine compartment.
It comprises two main sections.
| Diagram | ||
|---|---|---|
| No. | Description | Rating (A) |
| Section 1 | ||
|
||
| F1 |
|
300 / 400 |
| F2 | Passenger compartment fuse box (Gasoline) | 200 |
| Passenger compartment fuse box (Diesel) | 250 | |
| F3 | Electric power steering control unit | 100 |
| F4 | Signal Acquisition and Actuation Module (SAM) control unit | 40 |
| F5 | Radiator fan motor | 80 |
| F6 | OM607 engine: Fuel heater control unit | 70 |
| F7 | OM607 engine: DPF regeneration auxiliary heater control unit | 125 |
| F8 | OM651, OM607 engines: Glow plug output stage module | 100 |
| F32k1 | Decoupling relay | - |
| Section 2 | ||
|
||
| J | Horn relay | |
| K | Windshield wiper speed 1/2 relay | |
| L | Windshield wiper ON/OFF relay | |
| M |
|
|
| N | Circuit 87M relay | |
| O | Circuit 87 parking pawl control unit relay (Model 242.890) Transmission oil cooling circulation pump relay |
|
| P | Reserved / Spare relay | |
| Q |
|
|
| R | Circuit 15 relay | |
| S | Circuit 87 relay | |
| T | Heated windshield relay | |
| 201 | Alarm siren | 5 |
| 202 | Auxiliary heater control unit | 20 |
| Model 242.890: Circuit 87 parking pawl control unit relay | 5 | |
| 203 | Right front headlamp | 15 |
| Transmission Control Unit (TCU) (Model 242.890) | 5 | |
| 204 | Electronic Stability Program (ESP®) control unit | 25 |
| 205 | Dual-tone horn (left/right) | 15 |
| 206 | OM651 engine: Common Rail Diesel Injection (CDI) control unit Model 242.890: Transmission control unit, Circuit 87M relay, Brake booster vacuum pump relay |
5 |
| 207 | Model 242.890: High-voltage battery coolant shut-off valve, Parking pawl control unit Diesel engines: Circuit 87M relay |
5 |
| 208 | Circuit 87 relay (M133, OM607 engines) | 7.5 |
| Radiator fan motor (Model 242.890) | 5 | |
| 209 | Left front headlamp | 15 |
| Reserved (Model 242.890) | - | |
| 210 | Heated windshield relay | 5 |
| Model 176 (from Sep 1, 2015), Model 246 (from Nov 3, 2014): Starter pre-relay | - | |
| 211 | CNG control unit (Model 242.848) | 7.5 |
| Heater circuit circulation pump (Model 242.890) | 15 | |
| 212 | M133, M270 engines: Circuit 87M3 terminal connection OM651 engine: EGR cooler bypass valve, crankcase ventilation line heater, cooling thermostat heater OM607 engine: CDI control unit, boost pressure actuator, upstream O2 sensor Model 242.890: Electric drive and charger coolant pump |
15 |
| 213 | Model 242.890: Battery coolant pump 1 M133, M270, OM651 engines: Circuit 87 terminal connection OM607 engine: Camshaft position sensor, downstream O2 sensor, CDI control unit, fuel metering valve |
15 |
| 214 | M133, M270, OM651 engines: Circuit 87 terminal connection | 10 |
| Model 242.890: Battery coolant pump 2 | 15 | |
| 215 | Gasoline engines: Ignition coils (cylinders 1–4) OM607 engine: CDI control unit, fuel metering valve, boost pressure actuator OM651 engine: Fuel metering valve |
20 |
| Model 242.890: Transmission Gateway Control Unit, Thermal Management Unit | 5 | |
| Model 242.890 (from Nov 3, 2014): High-voltage power distribution unit | 5 | |
| 216 | OM607 engine: Transmission control unit / Gasoline engines: Motor Electronics (ME) control unit | 5 |
| 217 | 724.0 Dual-Clutch Transmission (7G-DCT): Transmission control module | 25 |
| 218 | Electronic Stability Program (ESP®) control unit | 5 |
| 219 | Model 242.890: Parking pawl control unit | 5 |
| 220 | 724.0 Dual-Clutch Transmission (7G-DCT): Transmission oil auxiliary cooling pump | 10 |
| 221 | Model 242.890: Electric vacuum pump | 40 |
| 222 | Model 242.890: Electric A/C compressor | 7.5 |
| 223 | Reserved / Spare | |
| 224 | COLLISION PREVENTION ASSIST control unit, DISTRONIC® adaptive cruise control module | 7.5 |
| 225 | Model 242.890: Transmission control unit | 5 |
| 226 |
|
5 |
| 227 | Model 242.890: Power electronics control module | 5 |
| 228 | Model 242.890: Acoustic Vehicle Alerting System (AVAS) sound generator | 5 |
| 229 | Left front headlamp | 5 |
| 230 | Electronic Stability Program (ESP®) control unit | 5 |
| 231 | Right front headlamp | 5 |
| 232 | Headlamp control module | 15 |
| 233 | Reserved / Spare | - |
| 234 | OM607 engine: Transmission control unit | 5 |
| Model 242.890: High-voltage power distribution unit | 10 | |
| 235 |
|
7.5 |
| 236 | Signal Acquisition and Actuation Module (SAM) control unit | 40 |
| 237 | Electronic Stability Program (ESP®) control module | 40 |
| 238 | Heated windshield | 50 |
| 239 | Windshield wiper speed 1/2 relay | 30 |
| 240A | Terminal 50 starter relay | 25 |
| Model 242.890: Transmission control unit | 7.5 | |
| 240B | Without Start/Stop: Circuit 15 relay | 25 |
| 241 | Model 242.890: High-voltage electric heater system | 7.5 |
Passenger Compartment Fuse Box
The fuse box is located in the front passenger footwell beneath the floor carpet and cover panel.
Access overview.
| Diagram | ||
|---|---|---|
|
||
| No. | Relay | |
| A | Circuit 15 | |
| B | Rear window wiper | |
| C | Circuit 15R2 | |
| D | Heated rear window | |
| E | Circuit 15R1 | |
| F | Circuit 30g | |
| G | Circuit 87 parking pawl actuator motor (Model 242.890) | |
| No. | Fuses | Rating (A) |
| 21 | Auxiliary PTC electric heater (Diesel models) | 150 |
| 22 | Auxiliary battery relay (ECO Start/Stop function) | 200 |
| 23 | Left front door control unit | 30 |
| 24 | Right front door control unit | 30 |
| 25 | Signal Acquisition and Actuation Module (SAM) control unit | 30 |
| 26 | Auxiliary battery circuit connection (ECO Start/Stop) | 10 |
| 27 | Engine compartment fuse and relay center | 30 |
| 28 |
|
5 |
| 29 | Trailer recognition control unit (from Nov 3, 2014) / Trailer socket (until Nov 2, 2014) | 15 |
| 30 | Trailer recognition control unit | 5 |
| 31 | All-Wheel Drive (4MATIC) control module | 5 |
| 32 | Steering angle sensor / steering control unit signals | 5 |
| 33 | Audio / COMAND system control panel | 5 |
| 34 | Climate control operating panel | 7.5 |
| 35 | Models 117, 176, 242, 246: Heated rear window | 40 |
| Model 156: Heated rear window | 30 | |
| 36 | Driver seat lumbar support adjustment control unit, Driver seat control unit | 7.5 |
| 37 | Audio module / COMAND system display unit | 7.5 |
| 38 | Supplemental Restraint System (SRS) control unit | 7.5 |
| 39 | Overhead control panel module | 10 |
| 40 | OM651 engine: Transmission control module | 15 |
| Model 242.890: Transmission control module | 5 | |
| 41 | Panoramic sliding sunroof control module | 30 |
| 42 | Audio module, COMAND control module | 5 |
| Audio head unit | 25 | |
| 43 | PARKTRONIC / Parking assistance control unit | 5 |
| 44 | Left front reversible emergency tensioning retractor (ETR) | 40 |
| 45 | Right front reversible emergency tensioning retractor (ETR) | 40 |
| 46 | Front passenger seat lumbar support control unit, Front passenger seat control unit | 7.5 |
| 47 | iPhone cradle control unit, Navigation module | 7.5 |
| Adaptive Damping System (ADS) control unit | 25 | |
| 48 | Reserved / Unused | - |
| 49 | Drive Kit Plus control unit for iPhone | 7.5 |
| COMAND display cooling fan | 5 | |
| 50 | Reversing camera flap actuator / cover control unit | 5 |
| 51 | Reserved / Unused | - |
| 52 | Parking pawl actuator motor signal | 30 |
| 53 | Reserved / Unused | - |
| 54 | Reserved / Unused | - |
| 55 | KEYLESS-GO® system, Telematics communication module | 5 |
| 56 | Steering column module control unit signals | 10 |
| 57 | Special Vehicle Multifunction Control Unit (SVMCU) | 30 |
| 7.5 | ||
| Circuit 87 parking pawl actuator relay | 5 | |
| 58 | Special vehicle auxiliary fuse box | 30 |
| 59 | Front passenger seat control unit | 30 |
| 60 | Driver seat control unit | 30 |
| 61 | Audio system amplifier | 40 |
| 62 | Electronic steering lock (ESL) control unit (Manual transmission 711) | 20 |
| 63 | Fuel pump control unit | 25 |
| Model 242.890: Transmission interface control unit | 5 | |
| 64 | Electronic Toll Collection (ETC) control unit | - |
| DSRC Toll Communication Control Unit | - | |
| 65 | Glove compartment light | 5 |
| 66 | Special vehicle auxiliary fuse box | 15 |
| Special vehicle electrical interface | 5 | |
| 67 | Reserved / Unused | - |
| 68 | Reserved / Unused | - |
| 69 | Reserved / Unused | - |
| 70 | Rear center console cigarette lighter / 12V socket | 25 |
| 71 | Luggage compartment cigarette lighter / 12V socket | 25 |
| 72 | Front cigarette lighter socket with ashtray illumination | 25 |
| 73 | Electronic Parking Brake (EPB) control unit | 30 |
| 74 | 30 | |
| 75 | Trailer recognition control unit | 20 |
| Model 242.890: Battery Management System (BMS) control unit | 5 | |
| 76 | Trailer recognition control unit | 25 |
| Model 242.890: Parking pawl control unit | 5 | |
| 77 | Trailer recognition control unit | 25 |
| 78 | Tailgate / trunk lid control unit | 40 |
| Special vehicle auxiliary fuse box | 40 | |
| 79 | Signal Acquisition and Actuation Module (SAM) control unit | 40 |
| 80 | Signal Acquisition and Actuation Module (SAM) control unit | 40 |
| 81 | Blower motor / interior fan controller | 40 |
| 82 | Overhead control panel module | 10 |
| 83 | Electronic Ignition Switch (EIS/EZS) control unit | 7.5 |
| 84 | Upper center console control panel | 5 |
| 85 | Anti-theft alarm system (EDW), tow-away protection, and interior motion sensor control unit | 5 |
| 86 |
|
5 |
| 87 | Data link connector (OBD-II diagnostic port) | 10 |
| 88 | Instrument cluster | 10 |
| 89 | Exterior light switch module | 5 |
| 90 | Left and right rear radar sensors (blind spot monitoring) | 5 |
| 91 |
|
5 |
| 92 | Mercedes GLA fuel pump fuse | 5 |
| Model 242.890: Transmission interface control unit | 5 | |
| 93 | Electronic Parking Brake (EPB) control unit | 5 |
| 94 | Supplemental Restraint System (SRS) control unit | 7.5 |
| 95 | Weight Sensing System (WSS) / passenger occupancy detection control unit | 7.5 |
| 96 | Rear window wiper motor | 15 |
| 97 | Mobile phone cradle / interface socket | 5 |
| 98 | Signal Acquisition and Actuation Module (SAM) control unit | 5 |
| 99 | Tire Pressure Monitoring System (TPMS) control unit | 5 |
| 100 | DIRECT SELECT gear selector interface (M133 engine) | 5 |
| 101 | All-Wheel Drive (4MATIC) control unit | 10 |
| 102 | Stationary heater radio remote control receiver | 5 |
| Model 242.890: Transmission control unit | ||
| AMG models (from Sep 1, 2015): DYNAMIC SELECT drive mode control unit | ||
| From June 1, 2016: Telephone and auxiliary heater antenna switch | ||
| 103 | HERMES control unit, eCall emergency call system, telematics communication module | 5 |
| 104 | Media Interface control unit | 5 |
| 105 | Satellite radio (SDAR) / Digital Audio Broadcasting (DAB) control unit | 5 |
| Radio tuner module | 7.5 | |
| 106 | Multifunction camera (MPC) | 5 |
| 107 | Digital TV tuner | 5 |
| 108 | Rear view camera | 5 |
| Rear view camera (from June 1, 2016) | 7.5 | |
| 109 | Luggage compartment 12V power socket | 20 |
| 110 | Engine sound generator control unit, COMAND control unit, Audio head unit | 30 |
Smoking guitar switch problem