i have a 1998 s70 t5 and i took bought a new head unit to put it. I took out the old one and it had 2 plugs of wires that went into it and my new one only has one with a different size plug of course. the problem is that the old 2 plugs had 20 wires all together and my new one only has 15 wires so i need to cut the old ones from the plug and crimp them to the new one but i need to know which wires on the old plugs are what and where they come from. anyone that has done this before i wolud greatly appreciate any help. my new head unit is a sony xplod by the way. thanks

 

this was taken from another site,hope it can help you, i had changed my radio in my s-70 but i bought the connections for it (about 12-15$)I only had to attach the new connector to the after market following the radio specifications then connect it to the ones of the cars.also bouht a casing made to hold cd's to close the gap since the new radio was smaller.
http://volvospeed.com/Repair/radiocon.php

The two connectors are further broken down to "A" for the 14 pin (larger) connector and "B" for the 10 pin (smaller) connector. 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. To further break down the 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. Breaking down the 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.

 

Hey just to let you know i just did my install of a new Head Unit its honestly a 2 second job! First of you have to buy the wiring harness from any Besy Buy they sell it for 14.00CAD its a plug for Volvo 1992-2002, anyways all colors are exactly the same on the Harness you baught and the deck so match each color! Now the easiest thing to do is disconnect your stock radio, now do not plugin your harnes into the one you just pulled your stock deck out of. If you folow this cabel closely you will find a big chunk of yellowish foam, take the foam of and VOILA you hav found the ISO connactor. Unplug it if its currently plugged into and connect the wirign harness from your new deck volia Your done everything is working now! If you have the Premium Audio the only thing that will not work are your door speakers i havent figured it out yet, from what i was told i have to re wire the speakers, but im preatty sure i can hack it

 

yeah i just bought the harness and then matched up the wires. there all color coded, it was a 10 minute job all together once i had everything i needed, the most time consuming was splicing the wires. it works great and thanks guys. now im going to get new speakers, are they 6"? oh well ill find that out.

 

Hi quick question for you are all 8 of your speakers working?And dpends on what speakers you are refering too, the doors are 6.5" i belive and the rear shelf are 8"