07 camry with JBL - NO SOUND - Help !!

[n8dogg455]

Ok so here is the deal.

I no longer DD my Camry.
My wife has the longer commute, so she gets the newer car.

Anyway, I took the car on a road trip with my buddies last weekend, and i noticed that everyonce in awhile there was no bass in the car, just the 2 upfront tweets in the dash were working. It was intermittant, any only once in a while they wouldn't work so i figured maybe a loose ground or remote turn on for the amp

I got back from the trip, checked all the connections under the seat on the amp, and the grounds there and everything was fine.

2 days ago after seeing my wife off in the morning, she comes back in and says the radio doesn't work, and there is a large hum / flutter in the trunk.

I go outside and hear this god awful flutter coming from the rear passanger 6x9, I check the wires on the terminals on the speaker, and nothing. so i pull the wires off the amp and she goes to work.

When she came home I started to investigate more.
I checked all the fuses, and reset the computer (unplugged neg battery cable for about 10 mins) I plugged back in the wires to the amp, and everything was fine, well atleast no flutter / interference from that one speaker. However there still is no sound.


I am good with sound, well atleast sound systems i install. And this bad boy has me stumped ..... the Head unit functions fine but no sound, it loads, reads disks, it counts like it is playing a cd, the blue tooth works, or atleast the text works on the unit, but again no beep or lady saying listening .... the radio is still controlled by the buttons on the wheel, and when i tune it to a radio station it says ST for stereo .... but again no sound.

At this point, I am wondering what would be best to do to trouble shoot ?
check the back on the headunit fo bad grounds / loose wires? or play more with the wires by the amp to see if the stereo is transmitting to the amp, or if the head unit isn't turning on the amp, or sending music to the amp, or if the amp isn't sending juice to the speakers.

what has me really stumped is why the tweets in the dash always worked, but now they don't .... are they powered by the amp as well, or run right off the headunit ?

anyone have the wiring diamgram for the jbl system ?

also i might be int he market for the jbl headunit, or the factory amp if anyone has either or both of those and wants to donate or sell cheaply to science that would be great

[Joe Dirt]

I had a bunch of stuff in the trunk on one trip when all I got was sound from the front tweeters. I tried tapping the JBL unit under the passenger seat and nothing happened. I rearranged the stuff in the trunk, and rearranged some stuff that was laying against the bottom of the speakers and the bass came back. I think it was pressing on a speaker connector or something...

[n8dogg455]

Originally Posted by Joe Dirt

I had a bunch of stuff in the trunk on one trip when all I got was sound from the front tweeters. I tried tapping the JBL unit under the passenger seat and nothing happened. I rearranged the stuff in the trunk, and rearranged some stuff that was laying against the bottom of the speakers and the bass came back. I think it was pressing on a speaker connector or something...

interesting .... we had a camping trip the other weekend
that was when the bass / other speakers stopped, so i might have to look around for damaged wires .....

but that still doesn't explain the loss of tweets up from the other morning ....

[n8dogg455]

the static is back .....

this morning the wife comes back inside and says that terrible static sound is back. Again, nothing is on, but i am getting some crazy static/feedback in the rear passanger side deck speaker.

So as a quick fix i just disconnected the speaker output plug from the amp under the seat.

Sound goes away

HELP ME FIND A PERMINANT fix !!!

[MJZ]

maybe your headunit is just dead

[n8dogg455]

Originally Posted by MJZ

maybe your headunit is just dead

if my head unit is dead, why would it only output as static in one speaker ....
i agree it is a possibility, but how can i test / prove it out ?

before i go spending coin on a new headunit, i would want to prove it out
any ideas how to confirm that it is the head unit and not the amp ?

[BlackCamSe]

Sounds like the amp is bad.

[n8dogg455]

Originally Posted by BlackCamSe

Sounds like the amp is bad.

yeah might be ....
more i started thinking about it.

even if i pull the fuse from the head unit, and the fuse for the amp.
i still have that feedback / whine / static in just one speaker.
the whine doesn't increase/ decrease with acceleration, so it is not engine related...

kinda makes me think that maybe that speaker wire is making contact with a live power wire.
maybe the insulation rubbed or something.
maybe making contact with like the trunk release, or something back in my trunk ...


Does anyone know if the amp and headunit have any built in protection?
that might cause them to shut down if they see any voltage instead of just the resistance of the speaker....

i guess i need to start tracing wires back to the amp

[n8dogg455]

ANYONE HAVE A STEREO WIRING DIAGRAME FOR OUR CARS ??

I TRACED THE SOURCE back to the rear passanger speaker.
It is difficult to explain

but long store short i cut the wires that go to the back speaker and the static sound goes away, but so does the very slight music noises from the other speakers......

apparently removing the rear channel (cut both speakers) doesn't allow the amp to opperate the other channels like i was hoping ....

anyone want to lend me thier amp to try and determine if it is the amp or the headunit ???

[Streaker]

I had the same problem. It was the underseat amplifier. I bought a used one off someone on this site (pardon me for forgetting his name) installed it and no problems since.

[dirtrat]

Same here! a couple years ago I had a buzzing/hum in my rear speakers even when my stereo was turned off. Turned out to be a bad amplifier under the seat. It was covered under warranty.

Originally Posted by Streaker

I had the same problem. It was the underseat amplifier. I bought a used one off someone on this site (pardon me for forgetting his name) installed it and no problems since.

[Streaker]

Toyota dealer wouldn't honor the warranty on my underseat amp., because I had a subwoofer wired into the system. The system was checked by a outside professional who vouched that it was the underseat amp and Toyota still wouldn't budge. He put everything back as it was, factory stock. Two other dealers I went to wouldn't touch it either because the first dealer had put the problem on the computer. TOYOTA

[n8dogg455]

yeah
i have found another thread on another site stating that the trunk lid torsion bars come out of thier clips and slap / hit the underside of the speakers and apparently when you open the trunk, some feedback travels back tot the amp and fries it ....

i have yet to open it up but that is what i am thinking it is ....

[Joe Dirt]

That is the same speaker that was contacted by my "junk in the trunk" from my above post... I also think the torsion rods from the trunk were pushed up there since there was a "pop" from them when I closed the trunk. Once pressure was relieved, the bass came back (I lost bass, not feedback)

Glad I didn't fry it, it sounds like we had the same issue. I think I'm going to get some old school jute-backed speaker undies from the junkyard to slap under them, to keep it from happening again inadvertently just to be safe.

[n8dogg455]

well i had time to open it up
here it is ...

problem now is i don't see anything wrong with it .... so now i have no idea what to check next.

anyone have a amp they wanna let me barrow so i can see if it is the amp or the headunit ???