Car horn replacement
This is where you can find useful information and valuable tips regarding the replacement of horns, with the Audi TT/RS and Grand Cherokee serving as examples.
Important safety note
The following technical information and practical tips have been compiled by HELLA in order to provide professional support to vehicle workshops in their day-to-day work. The information provided on this website is intended for use by suitably qualified personnel only.
The following retrofitting will now be shown using the example of an Audi TT/RS and a Grand Cherokee jeep. The instructions can also be used in conjunction with other vehicle models. Diagrams, pictures and descriptions serve only for the purposes of explanation and representation of these instructions and therefore cannot be used as a basis for the repair/conversion work.
Before starting the retrofit, the following points should be observed and, wherever necessary, carefully checked:
The power consumption of the new super-tone horn is indicated with 66 watts, an amount which in a 12 volt vehicle wiring system corresponds, purely mathematically, to a current consumption with 11.0 amperes for both horns.
In the vehicle which we are taking as an example, wiring with adequate wire cross-section, power relays and a 20A fuse have been already mounted in the factory. Therefore, in the case of a permanent load, there is the guarantee of sufficient power reserves throughout the entire circuit. Changing the electrical wiring in this case is not necessary.
If the onboard wiring or safety features are not adequate, then it is imperative to change these in order that they comply with the new installation situation.
Switch off ignition and remove key from the vehicle.
Because of the size of the new super-tone horns, it is necessary to check that the best mounting position has been selected. The body of the housing must be given sufficient room on either side in order to oscillate and it should not touch any adjacent body parts.
Connect the electrical connection to the super-tone horns, then plug in the wiring harness to the cable routing and secure.
If the function test is successful, the bumper cover can then be mounted together with all its assembly parts, thus making the vehicle once again complete and ready for service.
The body of the housing including the retaining plate determines the tone of the horn. Any change occurring to the retaining plate (holder) of the super-tone horn can bring about a negative alteration to the acoustic pattern.
Retrofitting on this vehicle is comparable as regards the basic structures involved. It is only the vehicle-specific mounting which has to be duly observed.
With this vehicle, the holder and the electrical connection could be taken over without the need for any adjustments.
Insert fuse and run a functional test
Finally mount the bumper cover again with all its assembly parts
Extract from the General Regulations pursuant to the ECE ruling R28 on "Audible Warning Devices/ Signals" of the United Nations for Europe: "The device for audible signals has to produce a uniform and constant sound; its acoustic spectrum is not to noticeably change while in operation."
During all retrofitting and conversion work, it is imperative to observe the product-specific mounting and repair instructions of each individual vehicle manufacturer at all times!
Diagrams, pictures and descriptions serve only for the purposes of explanation and representation of the instructions and therefore cannot be used as a basis for installation/assembly work. All rights reserved.