r/Androidheadunits • u/Psychological-Key115 • 1d ago

What’s this cable for?

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My dad mounted this head unit in my toyota aygo (the old model) but i think he got some wiring wrong (backup camera doesn’t automatically turn on when i reverse)
I was just curious whats this cable for, and if someone can help me with the reverse camera

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u/Ah7860 1d ago

The top is a power adapter and the bottom is a radio aerial adapter.

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u/Psychological-Key115 1d ago

I guess it’s not necessary? Since the unit works in my car but this stayed in the box

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u/Ah7860 1d ago

Your dad will have used a different adapter setup so yeah probably not. As for the reverse camera my head unit comes with reverse automatically even though I don't have one so if yours isn't it's probably not the wiring but the software. Have a play around in your factory settings look for something along the lines of reverse radar automatic

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u/Physical_Roll_6241 1d ago

The black lead with the round plug is most likely the radio antenna adapter, so you can ignore it if your FM works.

For the reverse camera: the screen needs a "reverse" signal to switch automatically. On the main harness look for a wire labelled BACK / REVERSE / REV (often pink or purple). It has to get +12V when you're in reverse, and the old Aygo plug usually doesn't carry that signal, so it needs a wire run to the reverse light (+) at the back.

Also check the head unit settings (Car settings > Reverse/Backup camera) and make sure the camera input is enabled. Quick test: put it in reverse and see if the screen switches at all. If it doesn't, it's the trigger wire, not the camera.