I recently lost sound to most of my right bank of speakers in my 2000 XJR. Initially I thought the head unit was toast as it was doing weird things - volume would jump all over when you tried to turn it up or down. Bought a used head unit and swapped it in, but I still have no sound in the passenger front and rear lower door speakers, and the passenger a-pillar tweeter. Weirdly I have sound from the passenger rear door tweeter.

So my next thought was that it was an amp issue. While the stereo was on an playing, I probed the back of the wires coming out of the large plug on the back of the Alpine amp and got 5ish volts from every pin to a ground point on the body.

I would think I just have a wiring problem, but the schematic from the factory electrical manual has the rear door tweeter and lower speaker sharing the same line (see below). This leads me to think that if the rear door tweeter is working, but the lower one is not, that my problem is in fact bad speakers? Before I start ripping off door panels to access the speakers and test them I wanted to check if anyone had any other thoughts or ideas?

Thanks

 

Before you do all that check the speakers with your DMM. Sometimes they lose continuity and just need a dab of solder to fix. I had 6 "bad" speakers but fixed 4 of them as the voice coil was not connected to the speaker leads.
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Thanks - I am presuming I have to get to them from behind, correct? Or can i get them out by just popping off the speaker grilles? Haven't checked yet.

 

You must pull the door panels to access the speakers.

 

Put in four new speakers from Crutchfield. Super easy and now i have sound again. Still need to do my a-pillar and rear door tweeters but need to figure out the mounts for those!