[Welsh springer]

Hi guys
Need some help,I have a problem with my F32 2017 , I retrofitted the Alpine hifi over a year ago and had no problems until recently.

When the parking sensors kick in it mutes the radio ( all speakers - no sound except for some faint bass) but once the object is cleared the sound does not return to normal volume. only when the car has been powered down for a short while will it reset to normal.

Local dealer is being a little difficult over the diagnosis because the retrofit was not fitted by them, I am now trying to prove if the head unit is faulty or the Alpine .

Anyone got any advice or wiring diagrams showing the outputs from the head unit to the alpine including expected voltages.

Have anyone experienced a similar issue.