Volvo Radio missing, Aftermarket fire smell issue!

[dougrock]

viewtopic.php?p=293554&hilit=wiring+dia ... io#p293554

This here really put me in perspective of what I found and seen in the car so far ...And it looks like my "theory" was correct...the connector they messed with and threw out was the speaker connector known as "B" but of course it's all going to get another big big look over! This was the pic and written info that I was wondering about!! please see copy/paste below I see the pic did not come through...but I can go back another way when I get to this point......GUYS! again thanks for getting me started and idea's where I need to go...I've been on alot of different forums over the yrs...this one is like top notch in my opinion With what I've encountered with this Volvo!! Well, that's another deal....LOL...Volvo is for a special breed...I be honest my fav Conv of all time was the Cyr Lebaron, don't worry I got my hands on a MG...that was fun with Lucus wiring...lol...and not forget my Spitfire! So...been around town a little...getting older now though! Wiser? not so sure on that! be well be safe everyone!

Post by stone36 » Tue Jul 27, 2010 6:41 pm

Here is another image that has been wandering around the internet... All of the below info is from "Bay 13" over on Volvospeed.
radioconnectors.jpg
radioconnectors.jpg (13.29 KiB) Viewed 53595 times
Here is the description of what's what:
This layout is taken from a 1995 schematic, probably an SC-815 or 816, but all the SC's I've had plug in the same so it should be somewhat universal.

Lead colors are shown by letters: SB = Black, GR = Gray, W = White, R = Red, BN = Brown, Y = Yellow, P = Pink, BL = Blue, GN = Green, OR = Orange, VO = Violet.

14 pin "A" connector:
1A = Dash Left Speaker +
2A = Dash Left Speaker -
3A = Antenna +
4A = Battery + 12V
5A = Not used
6A = Ground
7A = Dash Right Speaker +
8A = Dash Right Speaker -
9A = Not used
10A = Rheostat +
11A = Rheostat Ground
12A Battery + 12V
13A = ACC +
14A = Ground

10 pin "B" connector:
1B = Left Rear Speaker -
2B = Left Rear Speaker +
3B = Left Front Door Speaker -
4B = Left Front Door Speaker +
5B = Right Rear Speaker -
6B = Right Rear Speaker +
7B & 8B = Not used
9B = Right Front Door Speaker -
10B = Right Front Door Speaker +

The rear speaker wires supply the rear hat shelf and door speakers if installed, wire coloring is the same for the hat shelf and the rear door speakers.

For my purposes it looks like I could get by without an additional cable by splicing into the A pin 12a, 13a, 14a for my power side and on the B pin 1B, 2B, 5B, 6B, for my "line level". Would that throw my HU amp off incredibly? Or would it be better to run +/- wires off my rear pillar speakers?

Sorry I still have a lot to learn about ohm's, load, and electronics in general.

[BlackBart]

Sorry I still have a lot to learn about ohm's, load, and electronics in general.

Heres what I know: Fire smell = bad.

[dougrock]

Sorry I still have a lot to learn about ohm's, load, and electronics in general.

Heres what I know: Fire smell = bad.

and we have funny guy here Black Bart...

Actually, it was the copy and paste that said "Sorry still have lot to learn about ohm's...electronics in general" but in reality, we all learn new things each and every day so I'll include myself there too..

and yes.....LOL fire smell=bad...LOL... Who ever was in there and slopped this aftermarket radio..had no pride. I'm taking the time here to learn..."how does Volvo do their wiring" How can I make this mess clean? How can I make this work and still have nice clean neatness when the next person pulls out the radio..for what ever reason...last of a dying breed I guess.

[dougrock]

SCOT850 and BEN who have posted...not sure how to add U to this conversation if it's even possible.

Thank U both so far! Been able to take your advice and knowledge and move forward a bit.

It was a little warmer today, so able to check the car out a bit more.

Yes, it is connector "B" that was cut and thrown away. It takes care of the speakers.
From what was there they where black/red on one lead(set)...neg and pos for one speaker.
There appeared to be only 4 sets
I do not know what "set" goes to what speaker, so I assume I will have to find an old hand held radio with speaker jack to figure out what "set goes where?(that speaker will make Noise when hooked up) Or is there a better way? without taking apart the whole car?
I looked under the pass seat...for the amp, as I do have an amp plug in at the radio area...did not see? where do I look in the trunk? cuz I looked there for the possible CD changer hook up or with luck a CD changer...nothing...didn't see an amp, but maybe I have to pull back some covers??
Ohh, and I got a radio to "play" with...for 20 bucks on ebay...it was the 8oo ones...not the 900 series. but we not there yet.

I was hoping the radio from ebay might have the old speaker plug in...but it did not...so I still have to find or buy that "B" plug they cut and threw away. any idea's? I found some on ebay, but not sure they will work, is there a part number to just that plug piece and not the whole wire harness?...... that's as far as I'm going right now... I will have questions later on perhaps getting the proper radio...but not sure due to thinking I don't have the fancy "top of the line" set up in this Volvo?...

Last question.....that GREEN sq plug that only goes in the 900 series is for what? the dash center speaker? Cuz if so that will remain unpluged playin' with this 800 type radio...as it does NOT have that hook up.

Thanks....again...kinda gonna be a stretched out project

[dougrock]

SCOT850 and BEN who have posted...not sure how to add U to this conversation if it's even possible.

Thank U both so far! Been able to take your advice and knowledge and move forward a bit.

It was a little warmer today, so able to check the car out a bit more.

Yes, it is connector "B" that was cut and thrown away. It takes care of the speakers.
From what was there they where black/red on one lead(set)...neg and pos for one speaker.
There appeared to be only 4 sets
I do not know what "set" goes to what speaker, so I assume I will have to find an old hand held radio with speaker jack to figure out what "set goes where?(that speaker will make Noise when hooked up) Or is there a better way? without taking apart the whole car?
I looked under the pass seat...for the amp, as I do have an amp plug in at the radio area...did not see? where do I look in the trunk? cuz I looked there for the possible CD changer hook up or with luck a CD changer...nothing...didn't see an amp, but maybe I have to pull back some covers??
Ohh, and I got a radio to "play" with...for 20 bucks on ebay...it was the 8oo ones...not the 900 series. but we not there yet.

I was hoping the radio from ebay might have the old speaker plug in...but it did not...so I still have to find or buy that "B" plug they cut and threw away. any idea's? I found some on ebay, but not sure they will work, is there a part number to just that plug piece and not the whole wire harness?...... that's as far as I'm going right now... I will have questions later on perhaps getting the proper radio...but not sure due to thinking I don't have the fancy "top of the line" set up in this Volvo?...

Last question.....that GREEN sq plug that only goes in the 900 series is for what? the dash center speaker? Cuz if so that will remain unpluged playin' with this 800 type radio...as it does NOT have that hook up.

Thanks....again...kinda gonna be a stretched out project

[BlackBart]

…Whoever was in there and slopped this aftermarket radio..had no pride. I'm taking the time here to learn..."how does Volvo do their wiring" How can I make this mess clean? How can I make this work and still have nice clean neatness when the next person pulls out the radio..for what ever reason...last of a dying breed I guess.

Thats so frustrating. I had a beater Fiat 124 Spider once, with a bunch of electrical quirks. I started digging around in the mess of harness and discovered the PO had replaced the dash with a junkyard piece, and there were TWO of everything electrical back there. It was unclear which things he abandoned and which things were connected to what. Some switches were the new dash, some were the old. Took me a long time to sort that.

[BEJinFbk]

Here’s a link to a speaker post that
includes information about a quick
and dirty speaker testing tool.

viewtopic.php?p=633108

[scot850]

Wiring diagram is your friend here. Even I managed to follow it! I built a speaker test box. The front speakers are individually wired. I think they are 8 ohm. That is on a V/S70 4 door car. C70 is a different beast unfortunately. They have the same dash small speakers but all the rest may be different. I pulled an almost full set and an amp from an 04 C70 convertible. It did not have the sub-woofers behind the seat back for the rear seats. Unfortunately someone had pulled one of the rear side panel speakers. On that car the speakers are Dynaudio? which are really nice speakers.

The front door speakers have a main and 'tweeter' where regular S/V70's only have one speaker. Same in the rear side panels, the C70 has a large and small tweeter type set up. I'm sure audiophiles are twinging at my description! LoL!

If you had the sub-woofers, there is an inline controller for it.

Your amp is unlikely to be under the passenger seat. It is more likely behind the trunk side panel on the LHS. You will have to remove the panel to access it or the antenna.

Rear connectors for the SC-901 head unit:

SC-901 wiring connections

Volvo SC Radio connections 001.JPG (224.75 KiB) Viewed 390 times

The Dolby unit plugs directly into the 'DOLBY' round connector and the center speaker into the green rectangular connector on the mid-right. This speaker only works with the Dolby unit in place which should be mounted on a bracket behind the head unit which mounts to the center floor tunnel.

The rest of the plug-ins are mostly self explanatory. I am not familiar with the C70 head unit wiring as it is slightly different although I believe the actual head is the same.

Your SC-815/6 unit does not have the DOLBY input/speaker output.

The SC-815 may only have one of the 2 lower RH antenna plug-ins (the larger one). The SC-816 has both.

External 6-CD player plugs into the CD round plug. On a regular none amplifier SC-815/6 unit you do not actually need the amplifier in S/V70's as it has a built in amp. The SC-900/1 3-CD units has no internal amp.

I'm not sure the capability of the SC-815/6 to drive the speakers in the C70 without an amp. I don't have experience of that. I did run them using an under seat amplifier while testing the ones I have.

As to contacting us, you can do it through this thread, but that relies on us reading it. I try to check daily. You can PM us directly. I usually recommend you do that if you want to flag an update to us specifically as the notification comes to my e-mail. I would still put all your updates in the thread as it means everyone can see them, and prevents double work!

This is my speaker test rig for regular S/V 70's, but I also used extra leads to run the C70 speakers.

Speaker test rig for S/V70

PXL_20230328_215242075.jpg (405.28 KiB) Viewed 390 times

Good luck!

Neil.

[dougrock]

Wiring diagram is your friend here. Even I managed to follow it! I built a speaker test box. The front speakers are individually wired. I think they are 8 ohm. That is on a V/S70 4 door car. C70 is a different beast unfortunately. They have the same dash small speakers but all the rest may be different. I pulled an almost full set and an amp from an 04 C70 convertible. It did not have the sub-woofers behind the seat back for the rear seats. Unfortunately someone had pulled one of the rear side panel speakers. On that car the speakers are Dynaudio? which are really nice speakers.

The front door speakers have a main and 'tweeter' where regular S/V70's only have one speaker. Same in the rear side panels, the C70 has a large and small tweeter type set up. I'm sure audiophiles are twinging at my description! LoL!

If you had the sub-woofers, there is an inline controller for it.

Your amp is unlikely to be under the passenger seat. It is more likely behind the trunk side panel on the LHS. You will have to remove the panel to access it or the antenna.

Rear connectors for the SC-901 head unit:


Volvo SC Radio connections 001.JPG


The Dolby unit plugs directly into the 'DOLBY' round connector and the center speaker into the green rectangular connector on the mid-right. This speaker only works with the Dolby unit in place which should be mounted on a bracket behind the head unit which mounts to the center floor tunnel.

The rest of the plug-ins are mostly self explanatory. I am not familiar with the C70 head unit wiring as it is slightly different although I believe the actual head is the same.

Your SC-815/6 unit does not have the DOLBY input/speaker output.

The SC-815 may only have one of the 2 lower RH antenna plug-ins (the larger one). The SC-816 has both.

External 6-CD player plugs into the CD round plug. On a regular none amplifier SC-815/6 unit you do not actually need the amplifier in S/V70's as it has a built in amp. The SC-900/1 3-CD units has no internal amp.

I'm not sure the capability of the SC-815/6 to drive the speakers in the C70 without an amp. I don't have experience of that. I did run them using an under seat amplifier while testing the ones I have.

As to contacting us, you can do it through this thread, but that relies on us reading it. I try to check daily. You can PM us directly. I usually recommend you do that if you want to flag an update to us specifically as the notification comes to my e-mail. I would still put all your updates in the thread as it means everyone can see them, and prevents double work!

This is my speaker test rig for regular S/V 70's, but I also used extra leads to run the C70 speakers.


PXL_20230328_215242075.jpg


Good luck!

Neil.

OK ...let's go backwards a little. Let's stick with the 900 series. (I only bought the 800 to play with and it was cheap) ok...so my thinking here is this...trying to picture what was there before it got butchered.

I have the green square plug in...this makes me think I should have the Dolby round plug as well.but I do not.
I DO have the AMP and the CD round plugs. My thought is I've been thinking that the speaker wire plug that was cut was the sq one that went to the center of the radio..."B"..... But?? IN rethinking this over.... I think it was the Dolby round plug that was cut off to get to the speaker wires for the dumb aftermarket radio What are your thoughts on this? or....I should have BOTH the round Dolby and the square "B" going into a 900 series radio? This answer would help me greatly! any thoughts?

Of course the other two round pointed ones are put in at the ANT area...that's not my concern.

BTW......HOW COOL U built that speaker box! But I'm not going to go that far.

but let's speak about speakers..... Ok let's say we figure out if the speakers went to a round Dolby....or the Square "B" center of radio...
my next hurdle....is I have a bunch of thick red/blk set wires to figure out where they go speaker wise in the car...so that I can wire them back in the missing sq "B"........or.........the missing round "Dolby"....... that's is why I mentioned perhaps me buying a small radio with and "ear" or "speaker" port so I can take the blk/red wires each set...and figure out what set goes where in the car by sound...??? ....WHY WHY WHY because there's no way when I rewire the either Dolby plug...or the Sqare plug for the speakers...do not know what speakers go to what port in the round or sq plug....Do U follow my dilemma? I do NOT know what speaker wires go to what speaker...so I have to figure that out before I can wire up either the round Dolby or...the sq "B" cent of radio... I may have sucked earlier trying to explain that...sorry. Any thoughts? thanks

YES! I'm trying to avoid taking apart the whole car to "Try" to "Trace" each damn speaker wire set to it's location so I can wire the Dolby or Square "B" correctly. If the damn wires where not all red/blk-4sets...but different color wires or marked...then I could see a chart and put them in the right spot on the "B" sq....or the Dolby plug...but that's not there in the car!

[scot850]

OK, with the SC-900/1, the larger of the 2 rectangular plugs does all the work when you have an amplifier. The smaller rectangular plug has only one wire into it. I think it is either for the lighting or the electric antenna. I'd have to look at a drawing.

IF you have the Dolby processor, it mounts behind the head unit on a plinth. It is about 5-6" squarish and about 4" deep if I recall.

Wiring to rear of SC-901 unit with floor amp.

P80 radio and amp cable 002.JPG (215.65 KiB) Viewed 386 times

This is the harness to the rear of my SC-901 unit. You can see both the Dolby connectors are unused as I don't currently have a dash center speaker fitted, nor a Dolby unit. I have both, but I'll get around to fitting them at some point. Having rebuilt my whole dash due to mount damage, I am reluctant to disassemble it again. My wife drives the car in the summer and she doesn't care.

I would expect the harness for the C70 amp to be similar at the head unit end. What I am not sure, is if the C70 amp has the Dolby unit separate or it may have it integral. That I don't know.

Neil.