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Thread: loud buzzing - new headunit with factory Toyota JBL amp

  1. #1
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    loud buzzing - new headunit with factory Toyota JBL amp

    i just got an AVIC-D3 and after reading so many posts on here i was certain i could do the simple install on my own without paying $200+ to an install shop (can't really afford that at the moment anyway)

    i have a 2006 Camry SE with the single cd JBL factory amplified system. I was sold the metra 70-8113 wire harness w/ factory amp bypass. i dont have anything to solder with so i crimped the wires together and verified everything is tight, pulled somewhat hard on them and they wouldn't budge.

    the problem is after i installed the avic-d3 and turned it on, there was a loud buzzing from all the speakers.

    i immediately thought it was an issue with the ground, since i had originally spliced everything into the pioneer's ground (the metra's ground and the ebrake/mute wire for the d3 bypass) and grounded the pioneer to the only nearby spot i thought maybe i should ground them all seperately to the same spot (pretty much the only spot that some of the shorter cables i need to ground can reach such as the metra's ground and the mute). so i cut them and crimped ring terminals to fit in the bolt i used to ground them to the Camry. Still - same problem. So then i sanded the metal down and it looked nice and smooth/clean, so i re-grounded the metra's ground and the pioneer's ground (left the ebrake/mute ungrounded since they were not needed for troubleshooting purposes) but still the SAME buzzing sound from the speakers when the unit is turned on (even with volume down).

    i thought this would be easy, am i a complete ***? here are some pics so you can see what i did

    below: picture of the metra and pioneer grounded


    below: another picture of them grounded


    below: picture of what i'm grounding them to


    below: picture of the metra connected to the pioneer's rca harness (the rca's for the speakers are connected and the blue/white amp turn on wire connected and the metra's ground)


    below: picture of the metra connected to the pioneer's harness (all unused wires are capped off, ignition wires are connected, battery wires are connected, and pioneer's ground is shown)


    i have tried grounding it to the chassis originally, then connected the ground from the metra harness and pioneer harness, same problem with both methods. i also tried using ground loop isolators and they take away the buzz when i hold the rca's and isolators outside of the dash but as soon as i put the wires and unit back in the dash it gets electrical interference that causes the buzz again. i tried without the ground loop isolators and just keeping the rca's outside of the dash to see if it's just electrical interference from all the factory wiring behind the dash but it makes no difference without the isolators.

    i've consulted several people with no luck at all on this but i found a 2007 toyota highlander owner who has the same type of jbl system as i do (the analogue jbl amp system - not the newer digital interface) and he's having the same problem. he's to the extent of bypassing the factory amp altogether.

    i'm all out of ideas.

  2. #2
    Variable Bitrate eric_barcus's Avatar
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    if you just ground the amp with out the headunit do you still get the buzz?
    also do just the amp with the power/ground/acc wires hooked up (no speakers) and start plugging in the speakers one by one see if its somewhere in that wiering,
    just start isolationg one piece out at a time pain in the *** but the only way to go

  3. #3
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    Quote Originally Posted by eric_barcus View Post
    if you just ground the amp with out the headunit do you still get the buzz?
    also do just the amp with the power/ground/acc wires hooked up (no speakers) and start plugging in the speakers one by one see if its somewhere in that wiering,
    just start isolationg one piece out at a time pain in the *** but the only way to go
    it's a factory amp and looks like this:
    [media]http://drri.home.comcast.net/~drri/avalon/amp.jpg[/media]
    i'm not really sure how to go about grounding the amp aside from however Toyota originally grounded it.

    i did try hooking everything up without the rca's connected (no speakers) and there was no buzz, soon as i connect any one of the 4 rca's the buzzing starts (so it buzzes in every channel/speaker)

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