Mercedes-Benz A-Class (W168; 1997-2004) fuses and relays



In this article, we consider the first-generation Mercedes-Benz A-Class (W168), produced from 1997 to 2004. Here you will find fuse box diagrams of Mercedes-Benz A140, A160, A170, A190, A210 1997, 1998, 1999, 2000, 2001, 2002, 2003 and 2004, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay.

Fuse Layout Mercedes-Benz A-Class 1997-2004

Cigar lighter (power outlet) fuse in the Mercedes-Benz A-Class is the fuse #12 (Cigarette lighter, 12V socket in trunk) in the Passenger Compartment fuse box.

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

Interior fuse box diagram: Mercedes-Benz A-Class (1997-2004)



Assignment of the fuses and relay in the passenger compartment
Fused functionAmp
1Gasoline 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 valve20
1Diesel engine: Diesel control module, Wastegate actuator, Throttle valve switchover valve, Exhaust gas recirculation pressure valve, Three-way catalytic converter temperature sensor10
2Gasoline/diesel engine control module, Ignition coils, Injection valves, FP relay module (coil), Electronic accelerator, Starter lockout relay25
3Electric fan (engine cooling), Electric fan (engine cooling) with air conditioning30
4Engine control module7.5
5Automatic clutch40
6FP relay module (gasoline)30
7Light module40
8Starter relay30
9Wiper motor40
10Rear wiper20
10Laminated roof40
11Combination switch (Wiper control, Headlamp flasher, Windshield washer pump (actuation)), RNS (Radio Navigations System)15
12Cigarette lighter, Glovebox illumination, Radio, CD changer, 12V socket in trunk30
13Front left power window or power window with excess force limiter Front right power window30
14Instrument cluster (time functions), Wipe/wash pump relay, Mobile phone15
15Airbag control module, ACSR sensor (automatic child seat recognition), Side airbag sensor, Side airbag sensor10
16Exterior rearview mirror adjustment, Exterior rearview mirror heater, Parktronic15
17Fanfare horn15
18Instrument cluster, Transponder and RFL (radio frequency locking), Motor electronics relay, Fan relay10
19Trailer coupling25
20Trailer coupling15
21Trailer coupling15
22Sound system25
23Make UP mirror illumination7.5
24Not assigned
25Not assigned
26Not assigned
27Not assigned
28Instrument cluster, last Instrument cluster, last Excess force limiter control module (excess force limiter)10
29Central locking, Seat installation recognition unit15
30DAS transponder (drive authorization system) and RFL (radio frequency locking), Electric instrument cluster7.5
31Rear window defroster25
32Portable phone, Radio or RNS (Radio Navigations System), CD changer, Front dome lamp, Rear dome lamp15
33Front left power window, Front right power window30
34Heater booster/freeze protection (diesel)30
35ATA control module 2x light relay, Siren10
36Front heated seats25
37VGS program selector lever (fully integrated transmission control), Heater booster coolant circulation pump (diesel)10
38Air conditioning control module (A/C compressor), Blend air recirculation flap stepper motor, Interior sensor blower, Heated windshield washer nozzle10
39Light module, Backup lamp, manual transmission/ automatic clutch, VGS backup lamp (fully integrated transmission control)7.5
40Stop lamp, left, right and center (ABS brake signal), Steering angle sensor10
41Air conditioning control module, Diagnostic socket10
42Rear left power window, Rear right power window30
43ESP (Electronic stability program), Brake switch, NC contact15
44VGS control module (fully integrated transmission control) or automatic clutch10
45Interior blower or air conditioning interior blower30
46Central protection by fuses80
47Power steering pump60
48Diesel engine: Preglow control module60
48Gasoline engine: Secondary air injection (AIR)30
R1Engine control (EC) relay
R2Fuel pump relay
R3ESP relay/TCM relay
R4Heated rear window relay


Light Control Fuses (in the instrument panel)

They are located in the side of the instrument panel on the driver’s side.Instrument panel fuse box location: Mercedes-Benz A-Class (1997-2004)

Instrument panel fuse box diagram: Mercedes-Benz A-Class (1997-2004)

Light Control Fuses
Fused functionAmp
1Left low beam7.5
2Right low beam7.5
3Left main beam
Right main beam
Main beam indicator lamp (instrument cluster)
4Left side lamp
Left tail lamp
5Right side lamp
Right tail lamp
58K instrument cluster
License plate lamps
6Left/right fog lamp
Left rear fog lamp


Engine Compartment Relay Box

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

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

Engine Compartment Relay Box
1Windscreen washer pump relay
2Horn relay
3Stop lamps inhibit relay
4Starter motor inhibit relay
5Engine coolant blower motor relay
6ABS/ESP pump motor relay
7Secondary air injection (AIR) pump relay (petrol)