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Reload Thread: Did I just fry my head unit??!!

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    focused313's Avatar
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    Did I just fry my head unit??!!

    Headunit: Pioneer AVH-p4000DVD

    One of my amps was acting stupid, so I started unplugging RCA's to see which channel was working while the HU was still on.

    Shortly after, I turned the car off, turned it back on the the HU was dead.

    First I checked the fuse on the back of the stereo...good.
    Checked the radio fuse in the fuse box of the car...good.
    Took a DMM and checked for voltage at the wire harness that plugs into the HU...12.4v.

    Now...I don't know anything else that could be wrong, other than a blow head unit. Given that this is completely my fault, as I know I've read somewhere that you should not disconnect and connect wires while the HU has power, do I have any options? Am I missing something to trouble shoot the issue?



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    Re: Did I just fry my head unit??!!

    all you unplugged were the RCAs? that will kill a pico, but shouldn't zap the unit. you sure nothing else touched? does the unit have a reset button? i'm sure it does. that may help too.



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    Re: Did I just fry my head unit??!!

    Quote Originally Posted by jco1385 View Post
    all you unplugged were the RCAs? that will kill a pico, but shouldn't zap the unit. you sure nothing else touched? does the unit have a reset button? i'm sure it does. that may help too.
    if it does have a reset button, I haven't seen it. I'll google it though. Thanks.



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    Re: Did I just fry my head unit??!!

    I still don't have it working correctly yet, BUT, I ran the accessory wire from the harness to my switch to turn the amp on, and the head unit powered up. Now I know it's a wiring issue somewhere, I just have to find it. I'm just happy it's coming on. Thanks again to everyone.



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    Re: Did I just fry my head unit??!!

    sounds like loose wiring job at the HU



    1994 Thunderbird
    JVC KD-AV7010
    Alpine 6x9 3-ways
    Pioneer 6x8 3-ways (rear)
    JVC CH-X1500 12-disc MP3 Changer
    Alpine Type X 12" 2 cubes @ 30hz
    MTX 404 runs the inside
    MTX 1501d runs the X
    Optima G75/25 RT up front
    2x Optima G31 YT in the trunk
    200a EA HO Alt (1/0 Big 3)
    ALL MY WIRE IS WELDING CABLE
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    DO NOT SEND ME ANYTHING USING UPS. I WILL NOT DEAL WITH THEM EVER AGAIN
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    Re: Did I just fry my head unit??!!

    I had this problem and I had a backup radio fuse under the hood that popped. Changed it out an never had an issue afterwards.




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    Re: Did I just fry my head unit??!!

    Sounds like poor wiring. Your ACC has either blown the fuse or come undone....



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