Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Electronic Antitheft System: Overview
Radio unit is equipped with an electronic Comfort antitheft system which operates in conjunction with the instrument cluster.
After disconnecting the radio power supply, the radio is ready for use again once the power supply is connected. The antitheft code does not need to be entered again. The requirement is that the first activation of the electronic antitheft system follows and that the radio is reconnected in the same vehicle.
The antitheft code is transmitted via the vehicle diagnosis, testing and information system VAS 5051 or the vehicle diagnosis and service system VAS 5052. The radio card and the label on the radio that were used in the past are no longer used.
To access the antitheft code the Guided Fault-Finding VAS 5051 or the Guided Fault-Finding VAS 5052 "online" must be connected (network connection) and the user must provide a valid program user id to retrieve a radio code. Refer to ELECTRONIC ANTITHEFT SYSTEM, ACTIVATING or ELECTRONIC ANTITHEFT SYSTEM, DEACTIVATING .
Radio navigation systems RNS MFD 2 and RNS MFD 2 DVD are equipped with an electronic Comfort antitheft system which operates in conjunction with the instrument cluster.
After disconnecting the power supply, the radio navigation system is ready to be used again once the power supply is connected. The antitheft code does not need to be entered again. The requirement is that the first activation of the electronic antitheft system follows and that the radio navigation system is reconnected in the same vehicle.
The radio navigation system is equipped with an electronic antitheft system
The electronic antitheft system is activated and will lock the radio as soon as:
- the voltage supply (terminal 30) drops below a certain value.
- radio unit fuse is burned through.
- the radio unit is disconnected from the voltage supply (terminal 30) (e.g. when removing radio unit).
- if battery (terminal 30) is disconnected to perform work on vehicle.
Electronic antitheft system function must be reactivated when installing a new radio navigation system. Refer to ELECTRONIC ANTITHEFT SYSTEM CODE .
A radio navigation system which has been locked by the electronic antitheft system will then show the letters "CODE?" on its display when switched on.
To remove the lock, deactivate the unit lock with the electronic antitheft system. Refer to ELECTRONIC ANTITHEFT SYSTEM CODE
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.