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HU-803 stereo replacement help?

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Redbox
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Year and Model: 2004 V70R
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HU-803 stereo replacement help?

Post by Redbox » Fri May 19, 2017 9:02 pm

So, I have the HU-803 in my v70r, and want to replace it with a new Pioneer AVH-X490BS. I ordered the standard Volvo wiring harness, new face plate for the dash and the antenna adapter. The wire harness I got has two rectangular plugs, but when I pulled the stock stereo I find one rectangular plug and two DIN plugs, so the new harness won't work. I understand there is an amp under the seat, and I guess some of the speakers are fed from that. I want to keep and use as many of the factory speakers as possible. I've searched for days trying to figure this out, and hoped that someone might be able to point me in the right direction for info. Wiring diagrams, adapters, etc. Any help would be greatly appreciated.

JRL
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Re: HU-803 stereo replacement help?

Post by JRL » Fri May 19, 2017 9:26 pm

The correct harness should be available
Yes, speaker wires go off the underseat amp
Where did you find the right faceplate? Hasn't been made for a very long time in the correct dark grey ( a one year cover plate, 2004)
2000 V70R Black, 141,000 miles (Wife's R, but she won't let me sell it)!
2007 V70 2.5T White/Oak 109,000 MILES. Polestar tune, IPD bars, rear spoiler, dark grey Thors, DWS 06, HU850, sub.

Contact info for purchases: jrl1194 (at) aol (dot) com

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kranz
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Re: HU-803 stereo replacement help?

Post by kranz » Sat May 20, 2017 3:06 am

I don't recall where I found this diagram (my apologies to the original poster).
Attachments
wiring HU-XXX more.JPG
wiring HU-XXX more.JPG (73.77 KiB) Viewed 362 times
Les is more.

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oragex
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Re: HU-803 stereo replacement help?

Post by oragex » Sat May 20, 2017 6:39 am

kranz wrote:
Sat May 20, 2017 3:06 am
I don't recall where I found this diagram (my apologies to the original poster).
from here ;) http://www.tehnomagazin.com/Auto-radio- ... nector.htm

The amp powers all but the center (dash) speaker which is wired directly to the head unit CT+ and CT- slots. Remember that the center speaker only works on Dolby and 3CH settings, while on Dolby the rear speakers don't have output.
2003 2.4i S60 automatic 120k miles

JRL
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Re: HU-803 stereo replacement help?

Post by JRL » Sat May 20, 2017 9:10 am

He's adding aftermarket, he will lose the center speaker
2000 V70R Black, 141,000 miles (Wife's R, but she won't let me sell it)!
2007 V70 2.5T White/Oak 109,000 MILES. Polestar tune, IPD bars, rear spoiler, dark grey Thors, DWS 06, HU850, sub.

Contact info for purchases: jrl1194 (at) aol (dot) com

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Re: HU-803 stereo replacement help?

Post by erikv11 » Sat May 20, 2017 11:41 am

oragex wrote:
Sat May 20, 2017 6:39 am
... The amp powers all but the center (dash) speaker which is wired directly to the head unit CT+ and CT- slots. Remember that the center speaker only works on Dolby and 3CH settings, while on Dolby the rear speakers don't have output.
Apologies to OP for the thread jack but this is relevant: So if none of the speakers is making sound in a HU-803 setup, like the problem is the HU and not the amp, correct?
'95 854 T5-R || m4.4 || 180k
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gone: '96 NA 850 210k, '98 NA V70 182k, '98 NA S70 174k

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oragex
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Re: HU-803 stereo replacement help?

Post by oragex » Sat May 20, 2017 12:06 pm

If the center speaker is properly connected (assuming it was an original equipment installed on the car and not some upgrade like I did on mine), it should work on Dolby mode even if the amp is busted. Just make sure to play with the Centre Effect knob, pull it in both positions and turn it left and right, when checking if the CS works. A busted amp will usually show signs of corrosion on the metal housing.

I'm actually not sure the CS works in 3Ch mode, JRL can help you with this. I bridged my CS so it works in all modes which is not the standard/original connection.
2003 2.4i S60 automatic 120k miles

Redbox
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Re: HU-803 stereo replacement help?

Post by Redbox » Mon May 22, 2017 5:26 pm

Thanks for the feedback everyone. I think I found the final part of the puzzle, but have to wait for delivery. When/if I get it worked out, I'll report back here with info on parts, etc.

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