Into one of the HU's rear connectors. Likely a verdant wire. For confirmation, refer to the Pioneer HU handbook.

First thing you should do is make sure the ground wire from the head unit is attached to a solid ground. Locate a chassis ground point and measure the resistance between the HU's ground wire and that spot. The ground wire, which is often white with a black stripe on Toyotas, is another option.

To me, it sounds like the engine's ignition system is causing electrical interference. How does it accomplish this? Is it solely dependent on the radio or does it use... Similarly to hooking up a phone by Bluetooth or another method.

For $14, I purchased a US version with an FCL code from this eBay vendor for my 2015 F15 X5. He may be in charge of your nation

Thank you for considering my suggestions.

Hi! Regarding the use of a vapor kettle for headlight restoration, I have a query. Is this solution anything anyone has tried before? Will this have an enduring impact? It appears from this video to be quite easy and cheap:

I appreciate it. Let me investigate.

I value your opinion. Not adding the cost of a diagnostic, it seems like I'll have to shell out a couple hundred dollars.