Mercedes-Benz A-Class (W168) (1997-2004) Fuse Diagram

Fuse box diagram (fuse layout), location, and assignment of fuses Mercedes-Benz A-Class A140, A160, A170, A190, A210 (W168) (1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004).

Mercedes-Benz A-Class (W168) (1997-2004)

Checking and Replacing Fuses

The fuses in your vehicle serve to close down faulty circuits. If a fuse blows, all the components on the circuit and their functions stop operating. If a fuse has blown, the inside element will be melted. Blown fuses must be replaced with fuses of the same rating, which you can recognize by the color and value. The fuse ratings are listed in the fuse allocation chart.

If a newly inserted fuse also blows, have the cause traced and rectified at a qualified specialist workshop, e.g. an authorized Mercedes-Benz Center.


  • Before changing a fuse, secure the vehicle against rolling away and switch off all electrical consumers.
  • Always disconnect the battery before servicing high current fuses.
  • Always replace faulty fuses with the specified new fuses having the correct amperage. If you manipulate or bridge a faulty fuse or if you replace it with a fuse with a higher amperage, the electric cables could be overloaded. This could result in a fire. There is a risk of an accident and injury.
  • Only use fuses that have been approved for Mercedes-Benz vehicles and which have the correct fuse rating for the system concerned. Only use fuses marked with an “S”. Otherwise, components or systems could be damaged.

Passenger Compartment Fuse Box Diagram

The main fuse block is located behind the floor panel on the right-hand side of the car.

Passenger Compartment Fuse Box Location

Passenger Compartment Fuse Box Diagram

Fused functionA
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
Diesel 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
Laminated 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 limiter30
Front right power window
14*Instrument 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
48Preglow control module (diesel)60
Secondary air injection (AIR) (gasoline)30
* The fuse F14 has been increased from 10 to 15 ampere as Fuse 14 for wipe/wash pump relay of chassis end number 033 655.
Only a 10 ampere fuse should be used up to chassis end number 033 654.


Light Module Fuse Box

It is on the left side of the dash panel.

Light Module Fuse Box (Location)

Light Module Fuse Box

Fused functionA
1Left low beam7.5
2Right low beam7.5
3Left main beam15
Right main beam
Main beam indicator lamp (instrument cluster)
4Left side lamp7.5
Left tail lamp
5Right side lamp15
Right tail lamp
58K instrument cluster
License plate lamps
6Left/right fog lamp15
Left rear fog lamp