The BSM unit is the equipment responsible for the electrical management of the engine. It collects all the data transmitted by the sensors.
What is the purpose of a BSM unit?
Why replace a BSM unit? The BSM unit is the equipment responsible for the electrical management of the engine. It collects all the data transmitted by the sensors, interprets them, and then sends commands to the various electronic parts of the engine. The BSM unit is a rather solid part that is rarely replaced.
The BSM unit, also known as the engine service unit, is the central piece responsible for engine management. Indeed, thanks to a complex system of electrical connections, it communicates with the various parts of the engine whose operation is automatic, such as sensors, probes, or valves.
The operation of the BSM unit is divided into three stages:
- Signal input;
- Data processing;
- Signal output.
The signals passing through the engine service unit are of two types: analog and digital. Depending on the type of signal, it is possible to determine its origin. Analog signals come from inductive or electrochemical sensors such as pressure sensors, temperature probes, or engine speed sensors. Digital signals come from electrical sensors such as speed sensors, camshaft sensors, or wheel sensors.
Data processing within the engine service unit is carried out via microprocessors. These ensure data management through the following functions:
- Data calculation to ensure signal output;
- Memory storage;
- Internal and external data communication.
Good to know: the engine service unit communicates and exchanges data with the interior service unit that manages the entire vehicle.
Once data processing is completed, the BSM unit sends control signals to various elements such as:
- Injectors;
- Anti-pollution equipment;
- Engine pressure controls.
What are the symptoms of a defective BSM unit?
The engine service unit is rarely affected by failures. Indeed, it is a resistant part that, due to its location, is rather well protected. However, it is not uncommon for the elements controlled by the BSM unit to be defective.
Thus, to know if the BSM unit is out of service, all the equipment linked to the engine service unit must be analyzed. To diagnose a BSM unit problem, electrical connections must be checked before blaming the BSM unit.
If you have doubts about the source of the malfunction, take your vehicle to a professional so they can perform an analysis using a diagnostic tool.
BSM Replacement
What to do if the BSM unit fails?
When the BSM unit fails, several solutions are possible depending on the severity of the situation. First, it is possible to replace the defective BSM unit with a new one. However, programming of the latter will be necessary.
It is also possible to perform a standard exchange. This process involves replacing the BSM unit with a reconditioned unit. The advantage of the standard exchange is that it allows obtaining a refurbished part up to 60% cheaper.
Finally, some companies offer to repair the BSM unit if it is not too damaged. The price of repairing the BSM unit depends on the severity of the failure.
What is the price of the BSM unit?
The price of changing a BSM unit ranges from €800 to €1500. As you can see, it is a rather expensive part to which the labor cost must be added. That is why it is wise to proceed with a standard exchange as it allows obtaining a refurbished part at a more advantageous price.
The engine service unit is the part responsible for the electronic management of the engine. It ensures the proper functioning of the probes and sensors that themselves ensure the operation of the vehicle's engine. Fortunately, the BSM unit is not a wear part and is rarely faulty. If you suspect your BSM unit is malfunctioning, compare nearby garages to have it repaired.
The IncarLine Advantage:
All IncarLine centers are equipped with "diagnostic tools" or electronic diagnostic devices, and all our technicians are trained in their use. Efficient and responsive, they can work on any type of vehicle and perform the necessary repairs. Our experts are at your disposal to ensure the maintenance of your vehicle.
IncarLine professionals can also offer you the best products on the market, from the most reputable brands. As well as an onboard auto diagnostic system to understand a technical problem encountered on the road, or a multi-brand diagnostic tool to analyze a malfunction on any type of vehicle.