It's nearly impossible to think of a system in a modern Mercedes Benz that doesn't have some electronic parts. Today's Benzes rely so heavily on electronics that they make up 40 percent of a new car's total cost, according to a 2020 Deloitte study. This dependence on electronics also applies to a car's most essential operation - electrical parts and a power source are required to start your Mercedes Benz and keep it running.
Issues with the power-generating parts and the electronics they power can result in anything from minor inconveniences to significant safety hazards. There's no such thing as being overprepared by learning more about your Benz's electronics. Doing so lets you know the tell-tale signs when they are faulty, what to do when they give you problems, and how to get the most out of your existing parts or new purchases.
Sourcing Mercedes Benz Electronics (OEM vs. Aftermarket)
Used Mercedes Benz electronics are either OEM or aftermarket. When you buy a Mercedes Benz in its original condition as when it came out of the factory, the parts it comes fitted with are OEM or Original Equipment Manufacturer parts. Parts made by third-party manufacturers and usable in the vehicle are known as "Aftermarket" parts.
While there are some Benz parts without any aftermarket substitutes, such as the COMAND System, for all others, we recommend investing in OEM parts to return your Mercedes Benz to its original performance level. Because of the more stringent levels of manufacturing, you'll likely get more use out of an OEM replacement. Aftermarket parts might offer greater customization options, but not only are they not covered by Mercedes Benz's warranty, they could also void the warranty and even damage your vehicle when installed. Finally, aftermarket parts are not always guaranteed to be cheaper than OEM parts, so you might be paying less for better fit and quality.
What Are the Most Important Electrical Parts of Your Mercedes Benz?
Your Mercedes Benz's electrical system, made up of the battery, starter, and alternator, is relied upon by all the electrical parts in the vehicle. You should pay attention to electrical components critical for your Mercedes Benz's function and safety.
Battery
The battery stores electrical energy to operate the starter and keeps certain parts like the clock and radio running when the engine is off. It additionally supplies the necessary power for the ignition and fuel injection parts. As it is not meant for long-term power supply, the battery can deplete rapidly, resulting in a dead battery if the headlights are left on.
The 48V battery in a wide range of Benzes, such as the 2020 GLE and GLS-Class, the 2020 CLS, and the 2021 GLE, E-, and GLS-Class models, has been known for failing and being unable to start very early on in its lifespan. In some cases, replacing the battery fixes this issue.
Alternator
Once your Mercedes Benz's engine is up and running, it is the alternator that comes into play to keep the engine and all other electrical components working. Issues with a faulty alternator can result in no or trouble starting, dimming lights, and stereo output problems.
Starter
The starter is powered by the battery and is needed to run the engine. It contains a small gear connected to the engine's flywheel, delivering power and starting the engine up. Your Mercedes Benz will only be able to start if the starter is functioning correctly.
Fuel Pump Switch
The fuel pump switch is activated in an accident, cutting off the petrol flow to the engine to minimize the chance of a fire. When malfunctioning, your engine might occasionally shut off and need repair or replacement.
Cooling Fans
Cooling fans, or radiator fans, pull air through the engine radiator, allowing heat to dissipate. A faulty cooling fan can be catastrophic for engine health as it may result in overheating. These should be swapped out immediately if problems are detected.
Electronic Safety Systems
Electronic safety systems like adaptive cruise control, blind-spot warning, lane-departure warning, and parking assist, alongside other computer systems such as Dynamic Select and COMAND, all feature a medley of individual parts that can malfunction and cause problems with the system. You will likely need a trained mechanic to accurately diagnose where things have gone wrong in the chain.
Lighting System
External lights help your Mercedes Benz be seen and give you visibility on the roads, while internal lights allow you to see what's inside your cabin, including displays. The lighting system is crucial for your safety, so ensure all your lights are in working order.
Engine Control Unit (ECU)
The ECU is a computer that controls various engine processes like fuel injection and ignition to keep it running efficiently. When things run awry, the ECU also alerts you to issues that may be detrimental to the vehicle. Stalling and misfiring are some of the symptoms of a faulty ECU. A Mercedes Benz that cannot start might also signal a dead ECU that needs replacing.
Sensors
Sensors like the engine temperature sensor, air pressure sensor, air temperature sensor, oxygen sensor, and knock sensor all monitor the status and levels of performance of your car's many systems. Faulty sensors can cause severe damage to your Mercedes Benz by allowing systems to run unbalanced, so you should fix or replace them as soon as you identify them.
Which Mercedes Benz Electronics Wear Out the Fastest?
Consumables
Parts and materials that wear down and run out as they get used are known as the "consumables". These include short-life spark plugs, which produce a spark to ignite the fuel-air mixture.
Water Pump
The water pump operates continuously while the engine is running, pumping coolant from the radiator to the engine to flush heat away from the engine's various parts. It has a lifespan from 97,000 km to 145,000 km.
Suspension
Multiple factors determine the lifespan of your suspension, like the condition of the roads driven on, the weight of the loads carried, how frequently your Benz is loaded, and the overall mileage.
Proper maintenance can give you up to 10 years of suspension life, while careless driving can result in a 5-8-year life span.
Are Mercedes Benz Electronics Expensive?
The rule of thumb is that the price of parts is proportionate to the cost of the car. This rule rings true for Benz Electronics. Furthermore, you will want to account for the service fees of a professional, as electronic issues can be hard to diagnose unless you have the proper training.
Where to Buy Genuine Mercedes Benz Electronics Online
Authorized Mercedes Benz dealers and OEM parts retailers in your country will be the first stops for new OEM electronics. Offering you the same level of quality at a lower price are used OEM Benz electronics. When you buy with BE FORWARD Auto Parts, you can rest assured that you'll receive a genuine Benz part in excellent condition and at a hard-to-beat price. Get yours with us today!
Happy with the part I ordered. Shipping and communication could be a little better. Overall pretty happy.