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Old 10-09-2012, 04:55 PM   #1
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Question problem with sound system

Hi all. First post here.

I'm having trouble with some of the electronics in my 2000 Wrangler 4.0L. Before the last problem (which I'll get to in a sec), I noticed that my receiver would reset when I 1) drove over rough terrain, and/or 2) pressed certain buttons on the receiver faceplate. It's an Alpine FM/AM CD Receiver.

Then, I tried to change the oil on my Jeep but couldn't get the damn oil plug off. I was listening to the radio while I tried all methods to get the oil plug off, and when I finally gave up I noticed the radio shut off. I was mostly just curious about this until I got in the Jeep to take her to JiffyLube and the engine wouldn't start. Rapid clicking but no start. Some google searching helped me figure out that I should clean up the battery connections and when I did, she started right up.

Speakers still aren't working though. The receiver displays but no sound comes through. Interestingly, I took my dogs hiking yesterday and the speakers failed on the way up, but suddenly worked on the way down the mountain (???) until I hit a small bump and the speakers shut off again.

Thanks for your help.

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Old 10-09-2012, 05:09 PM   #2
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there has to be a loose wire or the headunit is shot.

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Old 10-09-2012, 05:10 PM   #3
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Welcome.

Sounds like the harness connection behind your headunit is loose, probably where the HU itself plugs up.
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Old 10-15-2012, 07:27 PM   #4
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The display on the head unit works though. Does that make a difference?

Also, unpredictably, the sound will come through the speakers. About half the time I get in the car to drive it works, and half the time it doesn't.
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Old 10-15-2012, 07:43 PM   #5
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Quote:
Originally Posted by redqueenblack
The display on the head unit works though. Does that make a difference?

Also, unpredictably, the sound will come through the speakers. About half the time I get in the car to drive it works, and half the time it doesn't.
The headunit has 2 power wires (1 constant for memory & the other to turn it on), 1 ground, several (usually 4) pair of wires for the speakers, and several other various control wires that arent relavent for this. If the speaker wires, or a couple of them, are loose or not seated properly those speakers will come and go as that connection gets wiggled going down the road. If it is a power or ground, it will turn on and off sparactically as it goes bump down the road. If it does both it is the entire harness wiggling. If you have a flip down HU it may be those little contacts that you see when its folded down - if they are dirty or not shiny rub them gently with a pencil eraser, then blow off the pieces - but I haven't heard of this effecting speakers, only the speaker connection.

If those are good, it is an internal problem in the HU.

Hope that helps.
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Old 10-15-2012, 11:56 PM   #6
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Sounds like a speaker grounding out. It could be a from a loose connection at any of the 4 speakers too, especially if they are aftermarket replacements. As said above, check all the connections behind the radio - it doesn't sound like a power connection, so you will be focused on the white, grey, purple, and green pairs of wires. Make sure they are all tight and that there is no exposed wire anywhere. After that, check at each speaker.

If the radio never looses power, it is probably something with the speakers shorting. It could also be worn connectors between the faceplate and the radio, but usually the sound doesn't cut out when this happens.

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