Driver Rear Speaker not working

[Owen04]

Hey all,
Lately my driver rear speaker on my 08 Omega has not been working, I have checked all cables up to the head unit and all looks good. I tested for signal at the head unit using another speaker however there seemed to be no signal. I'm a bit stuck as to what to do next any ideas would be appreciated.
Cheers

 

[krusing]

F / R or L / R or both Balance Controls ?
could be a broken wire in the door transfer.
Other than that, best to back probe it to the head unit with a multimeter.

 

[Owen04]

Right Side Rear, I've pulled the trim off all the way up to the head unit and it is all connected properly, tested for signal at the head unit but nothing was recorded. I've got a feeling the head unit may be busted.