Devalue this adapter, because what you need for a particular vehicle is just as absurd as a depreciation due to lack of telephone mute preparation. For the former you have to say that it is an ISO to ISO adapter that always fits with ISO connectors and is simply not designed for vehicle-specific point solutions. The second dates back the telephone mute function of the Stone Age of car phones or mobile installations. Since there are car radios with Bluetooth, this function is obsolete.
Fortunately, the delivery was carried out even with PLUS and permanent positive already apart so that you do not bother to raise the plug, let alone having to think which of the many cables you have to pull them apart.
All in all a very useful part