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99 V70r: Stereo DOLBY AMP wiring diagram

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

smoovebert
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smoovebert

Volvo Repair Database 99 V70r: Stereo DOLBY AMP wiring diagram

Post by smoovebert » Tue Jul 19, 2016 4:20 pm

Hi!

I recently took possession of my 3rd P80 volvo, and one of the first things I normally do when I get these things is put a new stereo in it, so I have Bluetooth and all the modern conveniences. I had a seamless experience with my 99 N/A using the normal Metra harness adapter, and I had a relatively easy experience with my 00 V70R, interfacing my aftermarket head unit with the factory amp.

I had hoped that my experience with this new car would be similar—the head unit wasn't working but I pulled it out quickly to see that the wiring harness was in there. A couple of days later when I went to install my new head unit, I noticed that there were spliced wires of all kinds, and that the harness that WAS there didn't have all the wires going into it.

So, what I'm looking for is some sort of wiring diagram for the Dolby system (And is there an amp? It's not under the seat like my other car). I have found some other threads, but they are OLD and point to dead links.

Thanks in advance for your help! :!:

scot850
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scot850

Re: 99 V70r: Previous owner cut wiring harness for stereo.

Post by scot850 » Tue Jul 19, 2016 4:52 pm

What head unit is fitted to the car? Not all Volvo Radios have the amp or need them. If you have a single CD disc in head unit (SC-816) this has a built in amplifier, but I have sometimes found cars which still have an amp attached to this unit.

The Head units with the 3 CD built in changer (SC-900/901) do not have a built in amp, and that is usually found under the passenger seat.

Dolby unit as you know is behind the head unit. Older 850's and come 98 P80's have an amp fitted behind the head unit.

I have a few spare head units and amps, and maybe some wiring harness end pieces with the plugs on them so if you are stuck PM me.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

smoovebert
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smoovebert

Re: 99 V70r: Previous owner cut wiring harness for stereo.

Post by smoovebert » Tue Jul 19, 2016 6:14 pm

Hi Neil,

Thanks for the help! Apparently 2 owners ago had an aftermarket stereo, and he took it out and just stuck the original sc-901 in the hole—i was surprised to find that there was no amp under the passenger seat (my '00 had the amp under the seat). Is the Dolby unit also an amp, or is it just some sort of sound processor? I am trying to trace where all the wires go and what they do.

Thanks for the help! My other two installs were easy but I can't make heads or tails of the wiring.
1999 V70 N/A
2000 V70R AWD - Parts car (Mechanic ruined transmission by removing anchor bolt)
1999 V70R AWD

scot850
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scot850

Re: 99 V70r: Previous owner cut wiring harness for stereo.

Post by scot850 » Tue Jul 19, 2016 8:03 pm

To all intents, the amp is just on a wiring loop that connects to the original 2 connector that plug into the regular radio, runs to the amp and then returns. I'm not familiar with the Dolby system, but I think it is a processor but not sure of the amp capability. You do need a amp for all that system to run. Can't recall the product name but there is an aftermarket unit you can plug into the head unit that gives blue tooth capability.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

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BEJinFbk
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Re: 99 V70r: Previous owner cut wiring harness for stereo.

Post by BEJinFbk » Tue Jul 19, 2016 9:15 pm

Here ya go:
98 V70 Radio with AMP and Dolby.pdf
(650.35 KiB) Downloaded 407 times
'98 V70 R - Well Equipped for Life Up North... ;)

smoovebert
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Re: 99 V70r: Previous owner cut wiring harness for stereo.

Post by smoovebert » Tue Jul 19, 2016 10:23 pm

BEJinFbk wrote:Here ya go:
98 V70 Radio with AMP and Dolby.pdf
Thanks, this is exactly what I was hoping to find!
1999 V70 N/A
2000 V70R AWD - Parts car (Mechanic ruined transmission by removing anchor bolt)
1999 V70R AWD

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Clemens
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Clemens

Re: 99 V70r: Previous owner cut wiring harness for stereo.

Post by Clemens » Wed Jul 20, 2016 3:27 am

btw, the 850ies had the amp behind the center console / radio in front of the heater core. So if someone fiddled with the car already I´d try checking if they mounted an 850 amp there.
Summer: 1996 855 R
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abscate
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Re: 99 V70r: Previous owner cut wiring harness for stereo.

Post by abscate » Wed Jul 20, 2016 7:45 am

Flagged for inclusion into the VRD for the nice file.

Renamed topic for search parameters
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

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