There were a couple of threads on the UK Volvo forum at http://www.volvoclub.org.uk/ which discussed colors for each of the wires for various radios. If you are handy with a voltmeter, you can probably figure out the wiring. You should have a ground (generally a black wire), a wire for the electric antenna (generally a blue wire), either 2 or three power supply lines (usually you can identify these wires because they will have an inline fuse; one line will be direct to the battery to maintain memory for frequencies and such, one will only have power when the ignition is on, and another will tied in with the lamp dimmer controls. The CD connections for my SC-813 had a seperate connector. The other wires will be for the speakers and possible the sensor you are looking for. Each speaker will have two wires (+) and (-) but the (-) wires may be shared between 2 speakers. I have used a 9-volt battery to confirm speaker connections. Just connect the battery between the two wires that you suspect are speaker wires, if you hear static on a particular speaker, then you have found the (+) and (-) connections for that speaker.