We would like to inform you that the "audio volume reduction for acoustic navigation data" function on the vehicles mentioned above works in relation to the radio volume that has been set, owing to the design.
The audio volume reduction function can be tested as follows:
Activate the setting for audio volume reduction on radio (audio) (N87/2) (model 447.6/7) or on radio/radio with navigation (N87/8) (model 906) (see Supplementary Instructions for Audio 15).
Set the radio volume very loud.
During a navigation message, reduce the radio volume. The audio volume reduction should now be clearly noticeable during the next navigation message. If the difference in audio volume reduction is noticeable during the test, then the Becker® MAP PILOT (NAVBOX45) and the radio (audio) (N87/2) (model 447.6/7) or radio/radio with navigation (N87/8) (model 906) are OK.
If the settings for the radio volume and for the navigation message are almost at the same level, only a slight reduction takes place. The customer can perceive this as overlay and can complain about the audio volume reduction function. In this case, a test drive along with the customer is recommended so that settings can be made as per the wishes of the customer. For these reasons, no diagnosis or repair work or cost of components must be settled through warranty and goodwill. Do not replace any components!