Junior Member
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Join Date: Jul 2014
Location: Washington
Posts: 8
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Junior Member
Join Date: Jul 2014
Location: Washington
Posts: 8
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Radio Won't Power On - At my wits end
Quick Info:
2003 4Runner Limited V6
Installed years ago: Pioneer SPH-DA120
Recently installed a Garmin dash cam with the parking mode cable (used fuse taps into driver power seat for battery power and the ACC fuse for on power).
I also recently had problems with my air condition status light blinking and the AC not working. Searched around and found a post saying it was a common problem, replaced the relay and it's beed good ever since.
Problem of the day:
A problem i've always had after the aftermarket radio was installed was that FM radio reception became horrible. Wasn't a huge deal since I usually use my phone, but I did some searching and found a forum about using and adapter and splitter to bring the AM and FM antennas together and then plugging into the aftermarket radio, as well as making sure the amplifier has power to it.
Took everything apart, connected the two antennas and then plugged them into the radio... powered it up to test if there was any difference (there wasn't really), but before i could really get any farther than changing the station a couple times the radio just suddenly shut off. Turned the car off and back on and it still doesn't power on. Weird.
Must be a fuse right? Used my multimeter to check both 20amp fuses under the hood, they're good. Checked the 10amp on the back of the radio, also good. Checked to see if the harness has power... no go. Weird. Check the 12v outlet plug next to the gear shift and find it also doesn't have power. Extra weird. So then I go and check the ACC fuse under the dash (where I have it fuse tapped for my dash cam, which still has power and is working fine), and the ACC fuse is blown. I'm not sure how that could have blown when I was working on the radio, but hey, I barely know what I'm messing around with.
Replace that fuse and plug it back in still using the fuse tap. Excellent, now the 12v outlet and the factory radio harness both have power again. Plug in the aftermarket harness and the radio still doesn't power up. What the hell? I then use my multimeter to check the continuity of every wire from the pins on the factory side of the aftermarket harness to the connector on the radio side. They're all checking out fine. In the process I find a purple wire that had been partially cut somehow, even tho continuity on it still checked out. Respliced the connection and double checked continuity was still there, good to go. Checked the radio again, still nothing.
So now I'm starting to wonder if the aftermarket radio is dead. Okay, fine. Go find the old factory radio and try plugging it in to the factory harness. Nada. Double check the factory harness still has power, which it does. Take out my fuse tap in the ACC spot and put in a brand new fuse, still no joy.
I'm at my wits end here guys. I've done the troubleshooting that my amateur level of knowledge has allowed me to do. I'm hoping that this is some simple fix that i'm just overlooking, but I have no idea what it could be. I've tried doing some searching, but mostly just come up with replacing the ACC or back of the radio fuses and I've already done that. I truly don't understand how just using a Y to connect the AM/FM antennas could have caused this mess.
Any advice or help anyone can give would be greatly appreciated!
EDIT 1: Oh, I also pulled every fuse and checked for continuity, they're all good.
Last edited by FatedLegacy; 03-26-2020 at 08:40 PM.
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