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Please help anyone I cannot find anything about this anywhere. I’m trying to install an active sub and I need a line output converter due to no rca port in my head unit which I’ve bought can anybody help me wire the converter. I’ve attached a pic of my wiring harness

The main unit if the Infotainment is in the glove compartment.
There you can find the Quadlock connector.

Take a look at that tread
viewtopic.php?t=62043

Does you sub require a remote turn-on signal or can it work from DC offset (i.e. speaker level inputs and signal sensing)?

I don't think any factory unit has a remote turn-on output, but you might be able to avoid using an LOC if the active sub can take speaker-level inputs.

I was just looking at the Kicker keyLOC today. This little thing is awesome (and awful pricey), but not only does it convert speaker to line level but will produce a remote turn-on signal you can send to the sub.
It is also a DSP and helps defeat the factory EQ. I think these cars have reduced base response tuned in to save the cheap factory speakers. They keyLOC can help correct that. Only 2-channel though, but it will gain back some loss bass signal to feed to your sub.