stereo problems

[AgentSmith]

I have a 2002 Trailblazer with the basic CD player. The speakers in the rear doors do absolutely nothing, no sound whatsoever, no buzzing or anything. Recently, the main speaker in the passenger front door has been going in and out. Again, no buzzing, it just either works fine, or not at all. The tweeter works all the time. Hitting bumps doesn't have any affect at all. It's not like it goes out when I hit a bump and comes back on when I hit another or anything like that. I will be on a perfectly smooth highway for an hour and then suddenly the speaker starts working out of the blue. I've pulled apart the dash and wiggled all the wires, disconnected and reconnected the harness to the stereo. I've pulled the door panel off and wiggled wires, slammed the door, wiggled wires going to the door, everything to try to recreate it, it doesn't change it. Either works or doesn't, whenever it feels like it. Nothing ever happens with the rear speakers, they just never work. I've wiggled wires going to the fuse block under the seat, nothing changes. Tried to find a bad fuse or something, hoping there might be something simple like that, nothing. I know there's a common ground for the rear speakers, but I don't know where it's physically located, and I don't want to remove the carpet if it's underneath. BTW, drivers door speakers always work great. Any ideas?

[rmallory]

I'm having almost exactly the same problem with my '07 Silverado Classic - but just with the passenger front door. Rear speakers work great. I just pulled the radio (again) about a half-hour ago looking for anything that might be out of the ordinary. It's the strangest thing - the speaker either works or not. No buzzing or anything. Usually when I start the truck after being cold the speaker isn't working. At some point it will usually (but not always) just come on out of the blue while I'm driving. No bumps necessarily, although I've had it come on a couple of times while turing a corner. Once it's on, it will stay on as long as the truck is running.

I'm just about ready to pull my hair out on this one.

[AgentSmith]

I was looking into this more and found a post somewhere that mentioned that each speaker has it's own individual amplifier built in, and that when the amp goes bad, the speaker stops working. I'm wondering if this might be our problem. I guess while it's NOT working, you could switch the speaker with the side that is working, and see if that fixes it, then you'd know it's not a wiring issue, just a bad speaker. Maybe I'll try that.

[64C10]

my wife had a 99 blazer, and the back door speakers started doing the same thing. from what i could find the voice coils in the speakers had gone bad, replaced speakers and problem went away. hope this helps

[vncj96]

regardless if they have an amp or not pull the speaker out of the door, get a nine volt battery and connect pos. to pos. and neg. to neg. if the speaker doesnt move back and forth it is dead. If it does then you should check wiring all the way to the head unit could have been cut.

[AgentSmith]

If the wire was cut, the speaker would never work.

[Maximous]

regular AC Delco's dont have amps per speaker, thats the Bose system (which sucks), if the speakers are working sometimes and not others, and when they are working they sound fine, then its prob not a speaker problem, its most likely your head unit, quick easy and simple fix, buy an aftermarket head unit for 2 or 3 hundred bucks, not only should that permanatly fix your problems but now it will have more power per speaker and more adjustments to make it sound just right!!

[AgentSmith]

Yeah that head unit sux! I've been trying to sell this thing for about 4 or 5 months now, so I'm not putting any money into it. Anyone interested in a 2002 TB, 81k miles, great condition, $9700. Throw in a free Yamaha RT180 dirtbike. knightrider82@hotmail.com

[Maximous]

haha, sorry just bought two new vehicles