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190 (W201) (1982-1993) W202 (1993-2000) W203 (2000-2007)
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  • W203 (2000-2007)
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  • Checking the functionality of headlights and horn

Checking the functionality of headlights and horn (Mercedes-Benz C-Class W203)

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1. Turn on the ignition and check the functionality of all external lighting devices.

2. With the help of an assistant or by backing the car up to a wall, check the functionality of the brake lights. When you press the brake pedal, only the brake lights should light. Turn on all possible lighting devices located in the rear headlights (reversing signals, parking lights, etc.), then press the brake pedal again. If, when turning on the brake lights, you find a malfunction in the operation of any of the other lights, this may be due to an unreliable contact with the "ground" or poor contact in the headlight.

3. Now check the functionality of the optics. Turn on the low beam, then the high beam.

4. If burnt-out lamps are found, replace them following the recommendations given in Chapter Body.

5. Check the functionality of all interior lighting devices, including the glove compartment and luggage compartment lighting. Turn on the ignition and make sure that all indicator lamps light up. In Chapter User manual describes in detail which lamps should light up when the ignition is turned on. Start the engine. The indicator lamps should go out. When driving in the dark, check the functionality of all the backlight lamps (both the instrument panel and the dashboard). If a malfunction is detected, refer to the relevant section of the Chapter On-board electrical equipment.

Sometimes, lamps can fail due to rust appearing on them or on the sockets. Replacing the lamp will not get rid of the problem. In this regard, when replacing any lamp, carefully inspect the socket from the inside. If you find green or white deposits, remove them with sandpaper.



6. Turn on the low beam.

7. Set the headlight range adjuster to different positions and check whether the beams of both headlights are adjusted equally.

8. Finally, check the functionality of the horn.
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C-Class W203 / Maintenance
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W203 (2000-2007) 
  • General information
  • Introduction to guide
  • User manual
  • Maintenance
  • Power unit
  • Gasoline engines
  • Diesel engines
  • Cooling system
  • Ventilation and heating
  • Supply system
  • Injection system (gasoline)
  • Injection system (diesel)
  • Exhaust system
  • Ignition and control system
  • Charge and launch systems
  • Transmission
  • Mechanical gearbox
  • Automatic gearbox
  • Clutch and drive shafts
  • Differential
  • Chassis
  • Brake system
  • Car suspension
  • Steering
  • Body
  • Exterior (external elements)
  • Interior (internal elements)
  • Electrical equipment
  • Equipment and devices
  • Lighting system
  • Electrical diagrams (2000)
  • Electrical diagrams (since 2001)
W202 (1993-2000) 
  • General information
  • User manual
  • Driving a car
  • Car care
  • Maintenance
  • Power unit
  • Gasoline engines
  • Diesel engines
  • Lubrication system
  • Cooling system
  • Heating and ventilation
  • Ignition system
  • Fuel system
  • Injection system (gasoline)
  • Injection system (diesel)
  • Exhaust system
  • Transmission
  • Clutch
  • Car gearbox
  • Chassis
  • Suspension, wheels and tires
  • Steering
  • Brake system
  • Body
  • Exterior (external elements)
  • Interior (internal elements)
  • Doors and windows
  • Electrical equipment
  • Equipment and devices
  • Power devices
  • Lighting system
  • Electrical circuits
190 (W201) (1982-1993) 
  • General information
  • Introduction to the guide
  • Operation and care
  • Maintenance (gasoline)
  • Maintenance (diesel)
  • Troubleshooting
  • Power unit
  • Petrol engine I4
  • Petrol engine V6
  • Diesel engines
  • Engine overhaul
  • Cooling and heating
  • Power system (carburetor)
  • Injection system (gasoline)
  • Injection system (diesel)
  • Exhaust system
  • Charge and start system
  • Ignition system (I4)
  • Ignition system (V6)
  • Diesel heating system
  • Transmission
  • Clutch
  • Mechanical gearbox
  • Automatic gearbox
  • Cardan shaft and axle shafts
  • Chassis
  • Brake system
  • Car suspension
  • Steering
  • Body
  • Exterior (external elements)
  • Interior (internal elements)
  • Doors, locks and windows
  • Electrical equipment
  • Equipment and devices
  • Electrical circuits
 
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