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
The main fuse box is located on the front passenger side under a cover in the footwell.
An additional block is located near the headlight switches on the side of the dashboard.
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 block 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 layout of electrical equipment Mercedes w168 | |
|---|---|
|
|
| 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 |
