850 radio swap.

Kysa007 · Post by **Kysa007** » 09 Aug 2022, 10:17

I think I need amp cable and guidance with wiring.

Nikolaech · Post by **Nikolaech** » 09 Aug 2022, 12:08

You will need three documents. Download these three documents
X70_total_FR_GB_NL_DE.pdf Volvo Cars Accessories numbers, amplifiers, cables
TP3932202 wiring diagram 1998 Models S70, V70, C70 Coupe
TP3907202 wiring diagram 1995 Model 850
I don't have a manual in pictures.

Kysa007 · Post by **Kysa007** » 09 Aug 2022, 12:44

My 1997 V70R and I need cable

Post by **scot850** » 09 Aug 2022, 18:00

If you have the amp already, is it under the passenger seat. On LHD cars the amplifier is under the RH front seat and the cable runs up the inside of the center console to the radio. Connections are easy.

You may have the older style of amplifier which is behind the radio head unit itself.

: SC radio to amplifier cable; Wiring Harness SC900-901 to amplifier 001.JPG (220.06 KiB) Viewed 315 times

: Amplifier end of the cable; Wiring Harness SC900-901 to amplifier 002.JPG (207.5 KiB) Viewed 315 times

: Connections into the original harness behind the head unit; Wiring Harness SC900-901 to amplifier 004.JPG (222.81 KiB) Viewed 315 times

: Connections to the rear of the radio; Wiring Harness SC900-901 to amplifier 005.JPG (231.19 KiB) Viewed 315 times

Hope this helps.

Neil.

Kysa007 · Post by **Kysa007** » 10 Aug 2022, 00:09

: Under seat; 20220810_065832.jpg (356.65 KiB) Viewed 301 times

Kysa007 · Post by **Kysa007** » 10 Aug 2022, 00:11

: In to radio; 20220810_070256.jpg (337.77 KiB) Viewed 301 times

Kysa007 · Post by **Kysa007** » 10 Aug 2022, 00:12

: And another 2 behind; 20220810_070322.jpg (353.36 KiB) Viewed 301 times

Nikolaech · Post by **Nikolaech** » 10 Aug 2022, 04:14

Read the topic, all about the amplifier. This will help you. viewtopic.php?t=30204&sid=dea61d3c5b4b0 ... 6cd468a0dd

Post by **BEJinFbk** » 11 Aug 2022, 21:16

Looks like someone originally had a 900/901
and replaced it with an amplified HU. If I'm not
mistaken, in the second image, the under seat
amp harness is plugged into itself. Unplug the
two sets of connectors in the foam.

The connector with the two red tapping connectors
should plug directly into the 900/901, along with the
connector with only a single black/yellow wire.

Then the two remaining A & B connectors can be mated.

You should also have a larger, 6 pin DIN Amp plug hiding
in there someplace. It runs the preamp level signal down
to he under seat amp. The smaller DIN plug in the first
image looks like the optional CD changer connector.

Don't forget both antenna plugs, small and standard size.

As for all of those red tapping connectors, remove the
ones that aren't connected and patch the pierced insulation
with some decent quality electrical tape. See where the ones
that still have wires connected go and decide if they should
remain or be removed.

Hopefully, this will all be plug and play.
You just need to rearrange the plugs to play.

Post by **scot850** » 11 Aug 2022, 23:22

Not sure what all the scotch block connectors are for. Looking at your last 2 pictures, it looks like the cables are connected wrongly.

In the 2nd wiring picture, the upper smaller connector is wrong. separate the 2 parts. That single wire should plug into the rear of the head unit.

The similar looking male plug in the upper picture should then plug into the female end that the single wire was removed from.

Similarly the other larger multi-wire connector is also wrong. Disconnect and plug the male part into your head unit. The connect the larger connector in the other picture to the female end. The foam that is on that plug Volvo used to cover the connection and stop them rattling.

The upper picture has the 2 antenna cables that plug into the rear of the head unit as well as the other plug. You then have one missing cable from the amplifier. If you look at my pictures that show the wires for the back of the head unit you can see the plug that BJ mentions above. It has to be tucked back there somewhere.

Forgot I had a couple of pictures on my computer:

: Wires to the back of the head unit (1); 2015-03-16 22.08.21.jpg (221.42 KiB) Viewed 250 times

In the picture above you can see all the connections needed for an SC-901 and amp.

Although my larger connector has all similar colored wires they are actually different. The 2 antenna wires are hidden down on the left hand corner of the rear of the head unit in the picture

: Missing connector; 2015-03-16 22.08.34.jpg (179.81 KiB) Viewed 250 times

You can see the missing connector on the right hand side of this picture.

Hope that helps.

Neil.

850 radio swap.

Re: 850 radio swap.