Mercedes-Benz A-Class Fuse Box Locations and Diagrams (1996-2004)

The first-generation Mercedes-Benz A-Class (W168), produced from 1996 to 2004, was a revolutionary model that introduced the brand to the compact car segment. With its innovative “sandwich floor” design, it offered enhanced safety and space efficiency in a small footprint. Despite its compact size, the W168 provided surprising versatility, advanced engineering, and the premium feel expected from Mercedes-Benz.

In this article, you will find fuse box diagrams for the Mercedes-Benz A-Class, covering models A140, A160, A170, A190, and A210 for the years 1996 through 2004. These diagrams offer essential insight into the vehicle’s fuse layout, enabling owners and technicians to identify and understand the function of each fuse and relay.

What’s Included:

Fuse Box Diagrams – Detailed, easy-to-read illustrations identifying fuses, relays, and their corresponding systems.
Fuse Panel Locations – Guidance on where the fuse panels are located within the A-Class, including interior and engine compartment positions.
Fuse Assignments – Comprehensive descriptions of what each fuse and relay controls, aiding accurate electrical diagnostics and repairs.

Whether you’re replacing a faulty fuse, diagnosing an electrical issue, or simply performing preventative maintenance, this guide helps ensure the reliability and safety of your Mercedes-Benz A-Class (W168).

Keep your first-generation A-Class running at its best with this complete fuse box, fuse panel, and relay guide tailored for model years 1996–2004.

The cigar lighter (power outlet) fuse in the Mercedes-Benz A-Class is located in the Passenger Compartment Fuse Box:
- fuse №12 (Cigarette Lighter, 12V Socket in Trunk)

What’s Included

Passenger Compartment Fuse Box

Fuse box location

The fuse box is located under the floor near the passenger seat (remove the floor panel, cover, and soundproofing).

The location of the fuses in the passenger compartment: Mercedes-Benz A-Class (W168; 1997-2004)

Fuse box diagram

Assignment of the fuses and relay in the passenger compartment

№	Fused function	Amp
1	Gasoline engine: Control module, ISC (Idle speed control), AGR-Ventil, Lambda heater 1, Lambda heater 2, Diagnostic socket, Cruise control, Secondary air injection relay, Secondary air injection valve, Shut-off valve	20
1	Diesel engine: Diesel control module, Wastegate actuator, Throttle valve switchover valve, Exhaust gas recirculation pressure valve, Three-way catalytic converter temperature sensor	10
2	Gasoline/diesel engine control module, Ignition coils, Injection valves, FP relay module (coil), Electronic accelerator, Starter lockout relay	25
3	Electric fan (engine cooling), Electric fan (engine cooling) with air conditioning	30 40
4	Engine control module	7.5
5	Automatic clutch	40
6	FP relay module (gasoline)	30
7	Light module	40
8	Starter relay	30
9	Wiper motor	40
10	Rear wiper	20
10	Laminated roof	40
11	Combination switch (Wiper control, Headlamp flasher, Windshield washer pump (actuation)), RNS (Radio Navigations System)	15
12	Cigarette lighter, Glovebox illumination, Radio, CD changer, 12V socket in trunk	30
13	Front left power window or power window with excess force limiter Front right power window	30 7.5 30
14	Instrument cluster (time functions), Wipe/wash pump relay, Mobile phone	15 10
15	Airbag control module, ACSR sensor (automatic child seat recognition), Side airbag sensor, Side airbag sensor	10
16	Exterior rearview mirror adjustment, Exterior rearview mirror heater, Parktronic	15
17	Fanfare horn	15
18	Instrument cluster, Transponder and RFL (radio frequency locking), Motor electronics relay, Fan relay	10
19	Trailer coupling	25
20	Trailer coupling	15
21	Trailer coupling	15
22	Sound system	25
23	Make UP mirror illumination	7.5
24	Not assigned
25	Not assigned
26	Not assigned
27	Not assigned	—
28	Instrument cluster, last Instrument cluster, last Excess force limiter control module (excess force limiter)	10
29	Central locking, Seat installation recognition unit	15
30	DAS transponder (drive authorization system) and RFL (radio frequency locking), Electric instrument cluster	7.5
31	Rear window defroster	25
32	Portable phone, Radio or RNS (Radio Navigations System), CD changer, Front dome lamp, Rear dome lamp	15
33	Front left power window, Front right power window	30
34	Heater booster/freeze protection (diesel)	30
35	ATA control module 2x light relay, Siren	10
36	Front heated seats	25
37	VGS program selector lever (fully integrated transmission control), Heater booster coolant circulation pump (diesel)	10
38	Air conditioning control module (A/C compressor), Blend air recirculation flap stepper motor, Interior sensor blower, Heated windshield washer nozzle	10
39	Light module, Backup lamp, manual transmission/ automatic clutch, VGS backup lamp (fully integrated transmission control)	7.5
40	Stop lamp, left, right and center (ABS brake signal), Steering angle sensor	10
41	Air conditioning control module, Diagnostic socket	10
42	Rear left power window, Rear right power window	30
43	ESP (Electronic stability program), Brake switch, NC contact	15
44	VGS control module (fully integrated transmission control) or automatic clutch	10
45	Interior blower or air conditioning interior blower	30
46	Central protection by fuses	80
47	Power steering pump	60
48	Diesel engine: Preglow control module	60
48	Gasoline engine: Secondary air injection (AIR)	30

	Relay
R1	Engine control (EC) relay
R2	Fuel pump relay
R3	ESP relay/TCM relay
R4	Heated rear window relay

Light Control Fuses (in the instrument panel)

Fuse box location

They are located in the side of the instrument panel on the driver’s side.

Fuse box diagram

Light Control Fuses

№	Fused function	Amp
1	Left low beam	7.5
2	Right low beam	7.5
3	Left main beam Right main beam Main beam indicator lamp (instrument cluster)	15
4	Left side lamp Left tail lamp	7.5
5	Right side lamp Right tail lamp 58K instrument cluster License plate lamps	15
6	Left/right fog lamp Left rear fog lamp	15

Engine Compartment Relay Box

Fuse box location

Relay Box location: Mercedes-Benz A-Class (1997-2004)

Fuse box diagram

Relay Box Diagram: Mercedes-Benz A-Class (1997-2004)

Engine Compartment Relay Box

№	Relay
1	Windscreen washer pump relay
2	Horn relay
3	Stop lamps inhibit relay
4	Starter motor inhibit relay
5	Engine coolant blower motor relay
6	ABS/ESP pump motor relay
7	Secondary air injection (AIR) pump relay (petrol)