I got an issue that is keeping me busy and driving me crazy.
Rear right woofer has became nearly silent, you can barely hear it. The midrange in the door card sounds loud as normal.
I replaced the speaker with another three spares I had laying around, with two same effect, with one there is some "movement", but again very low.
Removed the radio and replaced with another from a neighbor, same.
Open up the ISO connectors and swapped left to right the pins (a major pain in the butt), same. Is only that side that gives trouble.
I replaced the amp in the door with another I have laying around, same.
I shortened brutally the cable going through the door, in case it had gone bad somewhere unseen, no improvement.
I tested the speakers with a multimeter, all give around 3.4/3.5 ohm. The midrange in the door card, 2.5 ohm.
I tested the output to the woofer in the door amp, both give around 10Kilo ohm, I do not know if is right, but both are consistent.
I do not know what else to do ....
I am now seeing the ETM and the wiring diagram for the rear door bass speaker looks weird (page 144). Can someone help me interpret which cable goes which way in those connections? I can reroute them to match the diagram, if I can understand it (I am tired today, played with it for three hours after work ...)
Someone has messed around in this car in the past, so something might be out of line. I do not remember if this worked before, but I think it did.