Document ID: chunk:federal_register_of_legislation:F2022C01070:body:0:p19
Version: federal_register_of_legislation:F2022C01070
Segment Type: other
Provision Reference: 
Character Range: 50559–53386

and built in such a way that they, in the event of intrusion into or interference with a vehicle, provide a warning signal, and may include an immobiliser.
 The warning signal shall be audible and in addition may include optical warning devices, or be a radio alarm, or any combination of the above.
17.2. Vehicles which are equipped with alarm systems shall comply with the relevant technical requirements, especially with regard to electromagnetic compatibility (EMC).
17.3. If the AS includes the possibility of a radio transmission, e.g. for setting or unsetting of the alarm or for alarm transmission, it shall comply with the relevant ETSI Standards (see footnote 2 pertinent to para. 5.3.).  The frequency must be 433.92 MHz and the maximum radiated power 25 mW.
17.4. The AS and components thereof shall not activate inadvertently, particularly whilst the engine is in its running mode.
17.5. Failure of the AS, or failure of its electrical supply shall not affect the safe operation of the vehicle.
17.6. The alarm system, its components and the parts controlled by them shall be so installed as to minimise the risk for anyone to make them inoperable or to destroy them rapidly and without calling attention, e.g. using low-cost, easily-concealed tools, equipment or fabrications readily available to the public at large.
17.7. The system shall be so arranged that the shorting out of any warning signal circuit shall not render inoperative any aspects of the alarm system, other than the circuit which is shorted out.
17.8. The AS may include an immobiliser which shall comply with the requirements of Part III of this Regulation.
18. PARTICULAR SPECIFICATIONS
18.1. Protection range
18.1.1. Specific requirements
 The AS shall at least detect and signal the opening of any vehicle door, engine bonnet and luggage compartment.  The failure or switching off of light sources, e.g. passenger compartment light, shall not impair the control operation.
 The installation of additional efficient sensors for information/display, e.g. :
 of intrusions into the vehicle, e.g. passenger compartment control, window glass control, breakage of any glazed area, or
 of attempted vehicle theft, e.g. inclination sensor
 are allowed, taking account of measures to prevent any unnecessary sounding of the alarm (= false alarm, see paragraph 18.1.2. below).
 Insofar as these additional sensors generate an alarm signal even after an intrusion has occurred (e.g. by breakage of a glazed area) or under external influences (e.g. wind), the alarm signal, activated by one of the above-mentioned sensors, shall be activated not more than 10 times within the same activation period of the AS.
 In this case the activation period shall be limited by the authorised unsetting of the system as a result of the vehicle user's action.
 Some