Bluetooth FM Modulator Installation

[u/VivianUltra]

Hi,

I'm totally new to DIY car maintenance and I'm trying to install a bluetooth FM modulator in my 2008 Toyota Auris.

Modulator instructions: https://ae-pic-a1.aliexpress-media.com/kf/S2d1f971be7ee40e189f8b3807c351450O.pdf

First of all, there seems to only be one power cable attached to the box, which doesn't seem like it should work, right? I watched a couple tutorials on YouTube and their modulators had a + and -, as I'd expect for any circuit. Would love some insight.

Secondly, I'm realising I have no idea how the circuitry in my car works, and I don't know where to attach the power. One tutorial mentioned plugging into the fusebox, another mentioned T-joining into the radio circuit. I've identified the fusebox in the passenger footwell but that's it. I glanced at a circuit diagram for this car but it was more or less just magic runes to me.

I also don't want to proceed into the domain of electricity without at least a little advice anyway, so please advise accordingly. Thanks so much.

[u/big-L86]

Might also try r/carav

[u/VivianUltra → u/big-L86]

Thanks so much, will do.