Hi, my name is***** your mechanic automotive expert, and I will be happy to assist you today. In some cases, I may need more information to assist better. I apologize for any delay.
I try to be here most weekdays and some weekends. If you respond and I do not respond back right away I will do so as soon as I can.
Dear customer, i understand the problem that you present, there are several revisions that have to be made because this kind of problem can be due to several factors.
First, it is advisable to start checking the fuses that are under the dashboard because these fuses, any alteration in the electrical voltage can cause a certain fuse to burn, this makes the central locking systems not work correctly, in this case the power is being affected in the roof and trunk, so it is advisable to check it in the first instance since this is the most common thing that can affect these electrical systems
Second, the wiring . The wiring can generally suffer certain problems due to the accumulated moisture that causes corrosion causing interference in the signals and the electrical systems to not work correctly as both systems are related to the central locking system, it is recommended to check these wiring.
Third, it can become a little more worrying because it would be a failure in the central locking module, the central locking module as indicated is the one that receives the signal and sends it to the solenoid systems so it opens or closes correctly. The security systems not only work with the selenoids but also send the signals to the electric motors in charge of opening and closing, so it is advisable to verify it with a diagnostic equipment with Mercedes software such as an Mb Star equipment.
Do you understand me, dear customer?
Please let me know if you have any doubt or if there is anything else i can help you with.
Kind regards, Sebastian.