Audio issues

[monkeywrench88]

Hi Guys,

First post here. Looking for some expertise on Volvo audio systems...

I recently bought a 2004 V40. It's got 7 speakers - L/R front doors, L/R dash, L/R rear pillars and rear subwoofer. Currently, sound is only coming from the front door speakers and the subwoofer. All four of the other speakers are good - I tested them - but are getting no signal.

I'm guessing I need either a new head unit (HU-555), or a new amplifier. Any thoughts on how I can further troubleshoot this to determine which? Thanks a lot,

-Daire

[monkeywrench88]

I think I'm a little closer on this. Per wiring diagrams here - http://www.volvowiringdiagrams.com/ - the three speakers that work (front doors and subwoofer) are driven by the amplifier. The other four speakers are wired directly to the H/U via the grey rear connector. Looking like something wrong with the H/U.

[monkeywrench88]

Replacing the head unit solved the problem. Sound from all speakers again.