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no sound
07-16-2011, 08:30 AM
Post: #11
RE: no sound
Then you need to follow the rest of the procedures that I posted for you until you find where it is loosing the power.

Please let us know what you find.

Thanks for using the forum,
Garner

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07-16-2011, 10:07 AM
Post: #12
RE: no sound
Here's the tricky part where working without a wiring diagram and using some brain power comes into play.... and paper / pencil may be handy.

Using a process of elimination sort out the color combinations and jot them down as you go along. There will be 3 or 4 wires going to rear speakers and 3 or 4 going to the front. One "pair" for each speaker. There may be a comon negative feed for each end of the car, which is why some use only 3 wires in each direction. This may require you pop out a speaker to see what color is at the other end. Within the plug at the amp end there should be a chassis ground, at least one "hot" wire (probably hot all the time) and likely another hot wire that switches with the radio control. There should be 4 wires for an audio feed (likely another plug) that comes from the radio and the rest should be speaker wires. Once you have identified the speaker colors start testing to see if any go to chassis ground. None should! This will require a ohm meter or you could rig up something using a flashlight battery with scrap wire and just listen around for a clicking sound as you touch the various combinations.

Do not confuse chassis ground with a negative speaker feed. Speaker wires should never feed to ground, and this is likely where your problem is. It only takes one bad wire to shut the system down.

Not saying this will be the "fix all" but it's one more step to eliminate a common problem yourself before heading to a shop with an expert.
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07-16-2011, 06:10 PM
Post: #13
RE: no sound
Woops, I thought that you wrote “no” power. If it has power there could be a problem in the amp.

Hey Rupe, is there an easy way to wire around the amp with even one speaker to test and see if the rest of the system works? Possibly narrow down if the problem is at the amp or back further?

Thanks for using the forum,
Garner

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07-16-2011, 11:12 PM
Post: #14
RE: no sound
Probably not since any factory radio that uses a remote amp will only have "line level" output from the radio. Line level = less than one volt or roughly pre-amp stage, which might be audiable on a set of head phones at best but certainly not anything you can easily hear in a speaker. It would also come in on a shielded wire to reduce hum and static. Seeing as either a short or open circuit on the output (high current draw situation) may cause the amp to protect itself, this is why my first shot would be to clear up the outputs for both shorts and opens in the wiring. OTOH, we still need both a hot and a ground on the power supply side of the amp... and likely the amp has a fused feed from the battery (and a ground) plus a switched feel at some low amperage to turn it on and off from the radio via an internal relay.
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07-26-2011, 08:21 AM
Post: #15
RE: no sound
Well I was able to make an appointment at the dealer on my vacation yesterday,turns out it was the amp. To replace it the price is $428.00 because its a Boston Acoustic sound system.Thanks for all the help.
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07-26-2011, 08:21 AM
Post: #16
RE: no sound
Well I was able to make an appointment at the dealer on my vacation yesterday,turns out it was the amp. To replace it the price is $428.00 because its a Boston Acoustic sound system.Thanks for all the help.
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07-26-2011, 11:16 AM
Post: #17
RE: no sound
Thanks for posting the final fix as most do not take the time.
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03-31-2013, 01:14 PM (This post was last modified: 04-02-2013 02:12 AM by Alanbennett.)
Post: #18
RE: no sound
(07-11-2011 07:51 AM)njerome2002 Wrote:  I have an 07 Grand Cherokee with no sound the CD cheap speakers shows the radio is working. The amp is under the front seat Iam wondering if this could be the cause.All the equip. is stock.

Hello guys same problem here. My speakers are not generating any sound but everything seems to be fine. I check amp and fuse its working. But no sound. Any idea?
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03-31-2013, 02:02 PM
Post: #19
RE: no sound
Audio gear takes a good ear and lots of time to sort out. Common issues are shorted wires under the carpet from over heated exhaust or pinched by seat tracks where they bolt to the floor. Could also be a left-over from any prior collision work where wires chafe through years later.

What I would do is turn it up full blast the go around with an ear to each speaker. If you hear some sort of rushing sound (static?) that means the amp is working and the problem is further forward. If you hear nothing then you need to start checking the individual speakers. (with a meter or tap-test with a small battery) From there start pulling up the carpet and following the wires looking for damage.

You may go through all of these steps only to find a plug pulled out (partially) or a component has failed.

Let us know what you find and we can chat more.
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