I want to replace the stock stereo and need to know how the wiring goes to hook up the new unit. Any ideas on where to get a stereo wiring diagram?

 

No. You may want to try other Volvo forums. Start at the IPD site and go from there. They used different colors. You may have to just hunt down the colors yourself one wire at a time. If the old stereo works, hook it back up and start pulling 1 wire at a time and see what dropps off... Power, left speaker, rear speaker, etc.