ESP  - Electronic Stability Program   

             The aim of ESP is to maintain the trajectory of the vehicle as
the driver wishes it to be in turning the steering wheel. An
abrupt emergency maneuverer, a bend taken too fast and even
a damaged road surface can result in a loss of tire grip, meaning
that the driver is barely, if at all, in control of his trajectory.
By detecting the warning signs of such phenomena, ESP helps
the driver by attempting to correct the trajectory.

ESC - Electronic stability control

             ESC is a computerized technology  that may potentially improve the safety of a vehicle's stability by detecting and minimizing skids. When ESC detects loss of steering control, it automatically applies the brakes to help "steer" the vehicle where the driver intends to go. Braking is automatically applied to wheels individually, such as the outer front wheel to counter oversteer or the inner rear wheel to counter understeer. Some ESC systems also reduce engine power until control is regained. ESC does not improve a vehicle's cornering performance; instead, it helps to minimize the loss of control.


              When in Sport mode, the transmission will take longer to shift and rev the engine higher, consuming more fuel. The advantage is you’ll be ready to accelerate quickly because the transmission won’t need to downshift. 


              Alert you that something is wrong in the braking system somewhere. If it comes on, check your owner’s manual to find out its meaning.
Unlike the single-purpose ABS warning light, the brake warning light doesn’t have a standard meaning; it could be used for multiple purposes. For example, the same light may be used to show that the hand brake is on. If that’s the case and you’re driving, you ought to have noticed the smell of burning brake dust by now.
The light can also indicate that the fluid in the brake master cylinder is low. If so it may be the brake master cylinder requires additional brake fluid or it may be time for a brake fluid and brake system flush. Special care must be taken when maintaining the brake system, including not mixing of different brake fluids. Seek professional assistance if attension or maintenance is required.



              A coolant is a fluid which flows through a device to prevent its overheating, transferring the heat produced by the device to other devices that use or dissipate it. An ideal coolant has high thermal capacity, low viscosity, is low-cost, non-toxic, and chemically inert, neither causing nor promoting corrosion of the cooling system.
              This is normally the coolant level warning light. If this comes on it means that the level of coolant in your radiator is low and needs topping up.


               The coolant system is pressurised and it could easily release pressure and spray you with boiling coolant. Open the radiator cap only when the engine is cold. The cooling system should only be topped up with either a pre-mixed coolant or with distilled water.


              The mineral deposits in it boil out in the cooling system and calcium gets deposited around the inside of the radiator making it less efficient (which will eventually cause it to fail). It’s always best to use pre-mixed coolant. The coolant mixture behaves as an antifreeze in winter as well as a corrosion-inhibitor to stop your engine rusting from the inside out.


              Typically this light will come on if your oil pressure is too low. Low oil pressure is serious and if you continue to drive with this light on, eventually your engine will seize or die.
              To prevent car engine problems and the need for an emergency car service do not drive your car when you see this light come on.
              Low oil pressure can be caused by a failed oil pump, a blocked oil filter, oil sensor or strainer in the sump, or by low oil levels – for example if your engine is burning oil.
              Either way, you need to get it fixed, and fast. Low oil pressure has the potential to cause serious damage to the engine if not attended to promptly.
             Regular servicing will assist in preventing damage to your engine and extending the useful service life of your engine. The choice of oil is also very important with modern cars requiring the application of specific or special oils.


An ABS system consists of the following components:
  • Some wheel speed sensors
  • Brake calipers
  • A hydraulic motor
  • Some pressure release valves
  • A quick thinking computer (or control module) which coordinates the whole process

             When the driver hits the brakes this pressurises a hydraulic system which causes the brake pads to squeeze against the discs which causes the car to slow down. If the ABS system detects that one wheel is slowing down more rapidly than the rest (a symptom of wheel-lock) it automatically reduces the brake pressure on this wheel by opening a pressure release valve in the hydraulic system. ABS also has the ability to build the pressure back up via the hydraulic motor. The system reacts remarkably quickly, and compared wheel speeds many times a second. ABS systems can act on just the front wheels (which do most of the braking work), or all four depending on what car you're driving.


              An Airbag is a vehicle safety device. It is an occupant restraint consisting of a flexible envelope designed to inflate rapidly during an automobile collision, to prevent occupants from striking interior objects such as the steering wheel or a window.

              The light come on when the system detects a problem and sets a trouble code. You should have it diagnosed by a trained technician. The airbag system is not for do it yourself.
The light is on because there is a problem with the air bag system. When the air bag light is on the system is not working and will not deploy in the event of an accident.



              Every car today contains a rechargeable 12-volt battery. This battery powers everything electrical: the engine's control computer, the ignition system, the radio, the headlights, etc. So the battery is vital to the car's operation.
             Like all batteries, a car's 12-volt battery would eventually go dead if it were not recharged, so your car has a built-in recharging system. Most cars have an alternator, along with a voltage regulator, that keeps the battery charged and also provides electricity to the vehicle when the engine is running. A typical alternator can put out between 500 and 1,000 watts when necessary.
             Because your car is so dependent on the battery, all cars have a battery light on the dashboard that is designed to warn you if the recharging system fails. A simple circuit looks at the voltage that the alternator is producing, and turns the battery light on if it is low. 
             The battery light indicates a battery charging problem. If the battery light comes on and stays on while you are driving, the most common cause is a broken alternator belt. Total failure of the alternator is another possibility.
            The reason why your car can operate normally even though the battery light is on is because your car can run off the energy stored in the battery. Your car will run fine until the battery goes dead. At that point, nothing in your car will work. When the battery light is on, you can still drive your car to the garage -- you will not damage anything. But you want to get to the garage before the battery fails and your car dies.


            The brake pad warning light is designed to come on when the brakes wear down to about 25% left on the pads. It is triggered by an insert in the pads that has two wires attached. The wiring and pad is part of a ground loop that starts at the instrument cluster, goes through both brake pads and to ground. Once this path is broken, the brake pad warning light comes on.



                   It means one of your light bulbs are burnt out or an earth fault.


            This indicator will come on when a problem is detected in the engine. Further, the vehicle’s throttle may be limited when this light is illuminated in order to protect the engine. You will have power enough to limp to your dealer for repairs, which is what you should do.
If the vehicle is equipped with Electronic Stability Program (ESP), it will be turned off automatically. Its indicator light will then appear as well, indicating the Off condition. The EPC light needs to be addressed, after which both lights will go off.
               On VAG cars (Audi, VW, Seat, Skoda) EPC light is typically caused by a faulty brake light switch. There are several other items that can cause this light to come on. The EPC stands for Electronic Power Control, it is a function of the electronic throttle.

               FUEL LEVEL LOW         

      GLOW PLUG SYSTEM                                                  

Windshield washer fluid low is a special fluid for motor vehicles that is used in cleaning the windshield while the vehicle is being driven. A clean windshield is very important in terms of your safety, and washer fluid doesn’t freeze.

Tire pressure is 25 percent or more below the appropriate tire pressure. Driving with low tire pressure can lower your vehicle’s MPG, put a hamper on driving comfort, increase tire wear, and compromise your road safety.

High beam light   Main bean on


                High beam light   Main bean on


Fog beams indicator – it is activated and remains on once the driver turns on the fog beams



Mercedes Benz Fault Code Manual

ESP/BAS light
  •  ESP/BAS light – similar to the ABS indicator, but especially installed to inform the driver about a potential problem with the Electronic Stability Program technology.

    Active Safety Systems: ESP
    • ESP: Electronic Stability Program:
    Increases stability when cornering by helping to control oversteer and understeer 
  • BAS (Brake Assist System) If BAS is malfunctioning, the braking distance in an emergency braking situation is increased. There is a risk of accident. In an emergency braking situation, depress the brake pedal with full force. ABS prevents the wheels from locking.

    seat belt
    The seat belt warning lamp reminds the driver and front passenger to fasten their seat belts.

      Mercedes Benz Comand Operators Manual 



    Light switch MERCEDES

    Left-hand parking lamps
    Left-hand parking lamp
    Right-hand parking lamps 
     Side lamps, licence plate and instrument cluster lighting
    Automatic headlamp mode, controlled by the light sensor
     Dipped-beam/main-beam headlamps
     Rear foglamp

    Foglamp (only vehicles with front foglamps).
    If you hear a warning tone when you leave the vehicle, the lights may still be switched on.
    Turn the light switch to mbsymb1b_inv_00c3.png.

    The exterior lighting (except the side lamps/parking lamps) switches off automatically if you:
    • remove the key from the ignition lock
    • open the driver's door with the key in position 0

                         SRS consists of:
  • the mbsymb2_inv_0036.png SRS warning lamp
  • airbags
  • the airbag control unit with crash sensors
  • belt tensioners
  • belt force limiters
SRS reduces the risk of occupants coming into contact with the vehicle's interior in the event of an accident. It can also reduce the forces to which occupants are subjected during an accident.

Mercedes Owners Manual



  Child seat – this symbol informs the driver that there may be a problem with the rear-mounted child seat


Catalytic converter warning symbol

Some vehicles may have a catalytic converter warning symbol on the dashboard. If the light remains illuminated it could suggest a problem with a damaged, overheated or malfunctioning catalytic converter. Some other vehicles may illuminate the engine warning light id there is a problem with the catalytic converter. The engine management system may reduce power to the engine if there is a problem with the catalytic converter.

  Cruise Control  is a system that automatically controls the speed of an automobile. The driver sets the speed and the system takes over the throttle of the car to maintain the speed. The system thereby improves driver comfort in steady traffic conditions. In congested traffic conditions, where speeds vary widely, these systems are no longer effective. Most cruise control systems do not allow the use of cruise control below a certain speed.

4 Wheel Drive Indicator    4 Wheel Drive (4WD) Trouble Indicator symbol. This light will only be illuminated if there is a malfunction in the 4WD system. The light will also come on if the front wheel or tire diameters are different from those on the rear. The vehicles speed should be reduced immediately and taken to your dealer as soon as possible for servicing.

Red dashboard warning light
A red dashboard light suggests a potential serious problem to either the vehicle or to your safety. A red warning light may also be used to remind you of an important issue.

Orange or yellow dashboard warning light
A orange or yellow dashboard warning light is intended to provide the driver information that the engine or a component of the vehicle needs repairing or servicing.

Flashing dashboard warning light
A flashing dashboard warning light is used to inform the driver of a state of urgency that the engine or component of the vehicle needs repair or replacing.

Green or blue dashboard lights
Green or blue dashboard lights are for informational purposes to inform the driver that a system or utility is in operation.


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