Volvo Radio missing, Aftermarket fire smell issue!

[BEJinFbk]

Greetings -
I'm a lot more familiar with the S/V70 systems,
and I've never even climbed into a Coupe or
Convertible, let alone cracked one open - But:

I get the feeling that they all shipped with
a single speaker harness from the amp only
and not the way that Volvo added amps to
the sedans and wagons, with extra harnesses.

I suspect that you'll find all of the speaker
connections in the amp location, not behind
the HU location in the dash.

in C70's, I'm pretty sure that the 6-pin DIN cable
is the only signal connection from the HU back to
the amp in the trunk.

If you take a look at the diagram and component
location legend, there are no connectors for the
rear speakers between the amp and the rear speakers.

And the front speaker outputs from the amp run from
the trunklocation up to the "24/3B & 24/3C" multi connector
block, then out through the round door harness connectors,
"24/50 & 24/60" to the in-door cross-overs for the door's
bass and mid drivers.

The dash tweeters are fed from the same front amp outputs,
but get split to their own runs from the multi-block up to their
dash locations via the adjacent 24/1A block.

That's why there's only a single yellow/black in the
"B" connector block that's usually chock full of speaker
leads. That single lead provides a speed signal input
to the HU's ASC Active Sound Control, a Volvo speed
based automatic volume level control.

For background, the "B" connector usually has all of
the speaker leads right there in the dash for sedans
and wagons that typically shipped with self amplified
HU's like the SC-816. ( Adding an amp/Dolby for them
is done a bit differently ).

But AFAIK, all of the coupes and 'verts had at least a
4x60w, and sometimes a 4x100w in the trunk. Since
all three of the of available Alpine built SC HU's had
the 6-pin DIN for an external amp, it's a plug-N-play
set up for any of those available HU's. That made it
pretty easy to sell a dealer installed audio upgrade
without much effort. Easy money, and they like that.

The SC-813, SC-816 and SC-901 also share dual antenna
diversity tuning ( Big antenna connector is the main and
the small one is the sub), and a 6 disc CD changer connection.

As far as the Dolby - If you have a green connector
with a Blue/Black and a Blue/White in "E" block pin
locations 4 & 5, and a Dolby ProLogic speaker in
the middle of your dash pad, the Dolby feature is
a possibility for you. - If the speaker is OK. - Early
center channel speakers had a glued magnet and
they were very prone to failure. Later versions got
a through-bolt to keep them together. It's also not
unusual for people to thrash these systems and
just plain cook the voice coils and kill them that way.

That green connector also had 3 other pins for theft
protection, OEM phone mute and some kind of interface
with the convertible top module. Maybe the warning chime?
Hopefully, a 'vert owner will chime in here.

I'd focus on the rest of the system first. If you get
that up and running, then go back and tackle the Dolby.
It just piggy backs the core system.

And here are a few tips for using the diagrams:

[dougrock]

Greetings -
I'm a lot more familiar with the S/V70 systems,
and I've never even climbed into a Coupe or
Convertible, let alone cracked one open - But:

I get the feeling that they all shipped with
a single speaker harness from the amp only
and not the way that Volvo added amps to
the sedans and wagons, with extra harnesses.

I suspect that you'll find all of the speaker
connections in the amp location, not behind
the HU location in the dash.

in C70's, I'm pretty sure that the 6-pin DIN cable
is the only signal connection from the HU back to
the amp in the trunk.

If you take a look at the diagram and component
location legend, there are no connectors for the
rear speakers between the amp and the rear speakers.

And the front speaker outputs from the amp run from
the trunklocation up to the "24/3B & 24/3C" multi connector
block, then out through the round door harness connectors,
"24/50 & 24/60" to the in-door cross-overs for the door's
bass and mid drivers.

The dash tweeters are fed from the same front amp outputs,
but get split to their own runs from the multi-block up to their
dash locations via the adjacent 24/1A block.

That's why there's only a single yellow/black in the
"B" connector block that's usually chock full of speaker
leads. That single lead provides a speed signal input
to the HU's ASC Active Sound Control, a Volvo speed
based automatic volume level control.

For background, the "B" connector usually has all of
the speaker leads right there in the dash for sedans
and wagons that typically shipped with self amplified
HU's like the SC-816. ( Adding an amp/Dolby for them
is done a bit differently ).

But AFAIK, all of the coupes and 'verts had at least a
4x60w, and sometimes a 4x100w in the trunk. Since
all three of the of available Alpine built SC HU's had
the 6-pin DIN for an external amp, it's a plug-N-play
set up for any of those available HU's. That made it
pretty easy to sell a dealer installed audio upgrade
without much effort. Easy money, and they like that.

The SC-813, SC-816 and SC-901 also share dual antenna
diversity tuning ( Big antenna connector is the main and
the small one is the sub), and a 6 disc CD changer connection.

As far as the Dolby - If you have a green connector
with a Blue/Black and a Blue/White in "E" block pin
locations 4 & 5, and a Dolby ProLogic speaker in
the middle of your dash pad, the Dolby feature is
a possibility for you. - If the speaker is OK. - Early
center channel speakers had a glued magnet and
they were very prone to failure. Later versions got
a through-bolt to keep them together. It's also not
unusual for people to thrash these systems and
just plain cook the voice coils and kill them that way.

That green connector also had 3 other pins for theft
protection, OEM phone mute and some kind of interface
with the convertible top module. Maybe the warning chime?
Hopefully, a 'vert owner will chime in here.

I'd focus on the rest of the system first. If you get
that up and running, then go back and tackle the Dolby.
It just piggy backs the core system.

And here are a few tips for using the diagrams:

Thank U again both ya guys! For sure I think these Convertible's did a little bit of reverse " psycho" stuff compared to what ya's had to deal with. Not help when ya got someone who put an aftermarket in...and did a snip and cliP I don't care thing..I wish they threw the old stuff in the trunk in a box...that be so helpful! Anyhoots.. SIR! I think U clued me in on something here...and when it's warmer...I'm going to have to look...If U not explain to me why Neils pic showed the only one wire to the "B"...I'd been a bit lost!...Guys my more "positive" feeling is...I have that one wire going to "B" sq flat.....It's just been cut and taped against the other wires. I also feel that the Dolby PIN cable as U call it.....is what was cut...and those 4(or maybe 3) sets of wires with two each went to it? I for sure have to really dig deep into the trunk...and look very close at the radio wires again...I got a feeling the awful challenge is getting a DIN...and figuring out what wires go where in that DIN....and I'm going to also have to locate a "B" sq flat connector...just for that one wire...This is just a feeling guys...It's 11 degrees right now outside..Not gonna get frostbite but I will go through all our chat...and any links given so I can get better situated with what I got here.....THANKS AGAIN!

[scot850]

That one wire (yellow/black or yellow /violet)) is only like that on underfloor amplifiers which I am familiar with. The reason for that is all the speaker connections go directly from the amplifier to the the speakers.

When an amplifier is added to the radios, it was done using a long NLA wiring harness that connected to the original 2 square connectors ran to the amplifier and then back up to the radio and the speakers bypassed the radio. The yellow/black small wire was needed I think for the either the radio lighting control from the main lighting, or it was the trigger for the trunk antenna. I would have to look at a diagram again.

This is what the amplifier should look like

https://www.ebay.ca/itm/291578663311

Neil.

[dougrock]

That one wire (yellow/black or yellow /violet)) is only like that on underfloor amplifiers which I am familiar with. The reason for that is all the speaker connections go directly from the amplifier to the the speakers.

When an amplifier is added to the radios, it was done using a long NLA wiring harness that connected to the original 2 square connectors ran to the amplifier and then back up to the radio and the speakers bypassed the radio. The yellow/black small wire was needed I think for the either the radio lighting control from the main lighting, or it was the trigger for the trunk antenna. I would have to look at a diagram again.

This is what the amplifier should look like

https://www.ebay.ca/itm/291578663311

Neil.

GOOD IDEA !! Neil, thanks for that picture of the Amp...As soon as it gets warmer I'm gonna look even more hard for that thing! No matter where it's located! I'm leaning very strong here...that if I'm correct...?? I think the Dolby round DIN was cut off to use the speakers with amp for the aftermarket...At first with the pictures and research I had thought all the speakers had gone to the sq flat "B"...i'm leaning very big away from that thought...but...I will have to find more clues and I want to see that AMP! When I am able to feel my fingers outside...I will get some pictures to U guys....again..thanks for the idea's and the clues....what a ride! right! LOL...we'll get there...ohh we will!!

[dougrock]

Hey guys.....remember the saying in C&C...."put on the brakes!" yo man step on the brakes"! LOL...ok that said...I was missing out on something big here.

While I was looking for perhaps the "Dolby" DIN was missing for all those speaker wires I got hangin around with no place to go...

Well, I was thinking that all I had was Radio, the AMP, Possible CD player in rear, green push in for center speaker, and the two ANT male push in's...So where did the "DOLBY" thing come in!? I thought it was that 15+pin thing that went to the amp and then to speakers..WRONG!

I found this on our site......the DOLBY is a "processor" it's another damn thing that supposed to be in the car! little black box! see link!

https://www.matthewsvolvosite.com/a-com ... o-upgrade/

so????? this means that what? that someone also ripped out the DOLBY processor box to get to these red/black set wires of 4?
Damn I thought I was so close to having an idea what the hell happened here...I'm still going to look for the Amp...but now I'm gonna double look for the black box...but I did NOT see it behind the radio...as far as I can remember...so I will re-look when it's warmer.

[BEJinFbk]

Is there a Dolby speaker in the dash?

[scot850]

In this link here, there is a picture of the Dolby processor and bracket that mount behind the radio under the dash.

viewtopic.php?t=93867

The thing I do not know, is if in the C70 with the larger non-underseat amplifier (as seen in the link above), Has a separate Dolby processor or if it may be part of the larger amplifier. The car I pulled the speakers from did not have it, but it had had an aftermarket head unit fitted.

This is a new thing for me. Maybe someone with a C70 can check if they have a Dolby processor under the dash?

Looking a this parts listing from a Volvo dealer site, it shows the trunk amplifier, but also the Dolby processor. It does not show the underseat amplifier for the 2000 model year. I am always wary as sometimes these details can be wrong.

https://www.volvocarstorontoparts.ca/a/ ... 68980.html

Neil.

[BEJinFbk]

In this link here, there is a picture of the Dolby processor and bracket that mount behind the radio under the dash.

viewtopic.php?t=93867

The thing I do not know, is if in the C70 with the larger non-underseat amplifier (as seen in the link above), Has a separate Dolby processor or if it may be part of the larger amplifier. The car I pulled the speakers from did not have it, but it had had an aftermarket head unit fitted.

This is a new thing for me. Maybe someone with a C70 can check if they have a Dolby processor under the dash?

Looking a this parts listing from a Volvo dealer site, it shows the trunk amplifier, but also the Dolby processor. It does not show the underseat amplifier for the 2000 model year. I am always wary as sometimes these details can be wrong.

https://www.volvocarstorontoparts.ca/a/ ... 68980.html

Neil.

The Dolby processor is the same across all x70's
and always lives behind the HU in the dash.
The single high density DIN connector handles
processor power, preamp signal in and preamp
signal out for all 5 channels: FL, FR, RL, RR & Center,
The little 25w amp for the center channel speaker
lives in the SC-900/901. The output are pins 4&5
of the green ("E") connector.

And as mentioned previously in this post,
I don't believe the C70's ever used the
behind the HU or under the seat amps,
as the feed ends of all of the front and
rear speakers leads is back at the amp
in the rear. C70's are a very different
beast than the sedans and wagons.

Alpine designed, engineered and manufactured
the system specifically for the x70 series cars.
The C70 was the premium two door and they
included two versions of a V12 series based
amp that was tuned and OEM'ed for them.
They look like this:

4x60w:
https://www.ebay.ca/itm/331369764598?ha ... R-rCu9yiYw

4x100w:
https://www.ebay.ca/itm/264305865744?ep ... R8zSmNyiYw

For the same reason, even though there's
some good general information in the link
that Doug refers to, the wiring harness and
little 4x50w underseat amp aren't really
relevant in a C70.

[dougrock]

My two good guys......HOLD THE FORT! ok we got a different Animal here than we where guessing!!

...Chusterfield radio said the amp would be in the trunk under the Antenna...It was RIGHT!!! I found the amp and now it all is clear!!!

Here's how it goes...the Amp in the Trunk was sliced and diced...sadly. But...I can see what was done.
The amp has the speaker hook up at the top of the amp...and it goes to the speakers from there! that was butchered and someone ran a bunch of red and black wires to the radio area so they could provide speakers to the crap aftermarket radio.(because the speaker wires are at the amp NOT The radio)
The only leads at the radio are the Amp DIN that goes to the Amp in the back
the CD Player DIN from radio area to the trunk to a 6 CD changer(not there)
The rest of the wires pulled out of the amp where wires to "power" the amp.

So....it APPEARS that the "B" connector in the radio area.....DID NOT exsist...even for that one wire picture ya's sent me...

I'm going to try to send some pictures....I'm not good at this so hope they come in....

So what it looks like is I need help with figuring out the color speaker wires that go in the sq plug in the top of the Amp if I want to put this all back to factory.....

If the pic's come through......don't get confused by the sq piece of crap that's next to the stick shift...that's the stupid aftermarket sq plug in that they used to tie in their red/blk stupid home run wires for speakers and to splice into the "A" sq harness for power and such to the after market radio..... THANKS! and yes.....Volvo C70 is a different animal than the standard volvo vehicles!

[scot850]

C70 is definitely different to the regular sedans and wagons. That amp is where I said it was. The speakers are normally fed straight from the amp. I think BJ gave you a wiring diagram for the layout. On 'regular' speakers there is a '+' and '-' or '1' and '2'. + and 1 are the '+ve' feed to the speakers.

I am trying to figure out from a while back when I tested a speaker set from a C70 and pulled them. I set up a test system for speakers, amps and head units, and had to make some mods to test the C70 stuff. Like the regular V/S 70 the front and rear speakers are rated differently. The dash and front door speakers on the V/S are I think 8 ohm each and the rears are run in parallel and are 4 ohm each.

The dash small speakers are the same as the V/S 70. The door speakers are different in that there is a bass and tweeter that are linked.

In the rear side panels there is again 2 speakers on each side, again a bass and tweeter. If I recall (and still kicking myself here for not knowing/pulling this) there is a controller of sorts for these speakers. Then there are the optional subs which sit behind the rear seat cushion and sit into the trunk area. I did not see these on the car I pulled the speakers from, but there is some sort of controller for then as well in the rear.

My buddy has given me a bunch of parts to sort out for him, and in there there is a part called a Crossover network unit. Not sure if that is what controls the rear or subs. If you don't have/need it, then I have 2 brand new ones here.

Looking at the pictures (although some are harder as they seem blurred), you have a lot of the connectors there at the head unit area.

The small single pin connector is the antenna.

The multi-pin din type is for the amp or more likely the external CD unit if still fitted.

The large black rectangular connector is the main connector to the head unit and speaker out to the amp. Not sure what the green multi-pin is.

Sorry, some of your pictures are too blurred for my old eyes to tell more.

One of your previous posts had the wiring colors for the speakers so that should help.

It is a nightmare you have been left with. It will be painful, but it is a slow and logical process. Maybe opening access to the speakers may also help tracing the color and location of each wire?

Neil.