Gen 5 Prime XSE Premium - Adding a powered subwoofer to the JBL system and need advice

Hello,
I have a 2024 Prius prime xse premium with the jbl sound system, which harness and colors did you tap into for the two front speakers ? I’m looking forward to adding a jbl bass pro 12 in the trunk and as you mentioned before the front speakers are better than the rear. Also is it easier to just buy the harness and tap into that one compared to splicing the original harness ?

 

Yes

What it SHOULD be and what Toyota has made it to actually be are different things.

And this is not new to the Prius 5th Gen. It will not be changed no matter how much you complain about it. This is a deliberate choice by them that has persisted over years of some of their vehicles.

I still think you should've tapped the front signal. While I didn't check the EQ output for it personally, when I was reading up on this issue at the start of my upgrade journey people had mentioned that it did not give the full EQ signal. Whether that means it has bass roll off (the front does not at least up to 50 vol, didn't check past that), or that it just doesn't send highs (would make sense), I don't know. But since it's been stated that it's not a full EQ signal I just skipped it due to that and its weak output.

So if you're going back in, tap into fronts, set your crossover on your sub from 80-100hz (normally for a sub you wouldn't set above 80 but your sub has to compensate for the oem door speakers so it might be worth it to go to 100hz) and I think there's nothing else that I'd change given your current gear. Maybe wrap up the wires with some tesa tape and tuck them away but that's just if you're bored.

 

Go listen to the rear door speaker.

 

Hello,
Installing my powered sub today am I using the 24 pin connector or the 30 pin connector to run the front speaker wires to the amp ? Thank you

 

Just installed my Rockford Fosgate P-300 10T today. I used 16-18 AWG Posi-Taps and tapped into the WFR and WFL wires from the K91 JBL Amp Speaker Output Harness. This is the harness that’s closer to the front and has thicker wires. I obtained the following from an official electronic wiring diagram from Toyota:

WFR+ (pin 10. Lavender w/Blue Stripe)
WFR– (pin 25. Lavender w/white stripe)
WFL+ (pin8. Lavender w/Red Stripe)
WFL– (pin 23. Lavender w/white stripe).

The subwoofer sounds amazing. Not sure why people were tapping into the rear speakers. I purchased a 2 day subscription from Toyota GTS+ in order to obtain the EWD.

 

It’s great that you're diving into upgrading your sound system! For tapping into the JBL amp, it’s crucial to use a multimeter or wiring diagram to correctly identify the speaker-level outputs—typically, these are twisted pairs. Avoid guessing, as incorrect taps can cause distortion or damage. If the empty harness is unused, it might be for an optional feature—not necessarily helpful unless you confirm it’s pre-wired for audio.