Installed an after market CD player in my 95 4runner and everything was working great until 2 days ago. I have searched and searched so if this is a repeat I apologize. I have two plugs coming from the back of the radio, a large one and a small one. The small one is for the rear speakers. I have 4 speakers in the back of the truck, two on the side panels and two tweeters in the roof, all of which are factory. The two speakers in the panels quit working but the tweets still play. I took the dash apart and unplugged the small connector, tweeters stopped working, plugged it back, tweeters working again. So, I know the four wires should run 2 back speakers but I have four wires running 4 speakers. Does anyone know if there is a crossover or something in the back that would cause my speakers in the panels to crap out? I figured it had to be a common problem since they both went out and I know the plug on the back of the radio is working properly. Why did both panels go and the tweeters did not? Makes no sense to me. Thanks. https://www.yotatech.com/forums/imag...s/banghead.gif

 

dude, no idea. if it was a 94 pickup i could tell ya cause iv done all my audio work, but as for wires runin to back speakers wouldnt know. sry. heres what i would do, take it to a small audio business and ask if they could check it out for u. tell them ur problem and ask if they could look at it for like 10 bucks. most of the time they can tell u exactly what the problem is. hten u can either let them fix it and pay moer, or take it home and work it out urself. good luck

 

I do all my own too and something i started doing was running all my own wires.. That way if or when something happens i know where the trouble spots are...JMO

 

How about doing some trial-and-error testing with a multimeter?

 

Has anyone ever hooked up an after market stereo with the two plugs from the bottom of the OEM amp and had all 4 of the back speakers work?

 

wires probably run to rear larger speakers, then from there to tweeters, the tweeters will have a capacitor on them to tune out the bass... cheap "crossover" .... If you've been playing with a decent amount of bass, or just loud, with 12 year old stock speakers not meant to take a lot of power, and a new HU, maybe they are just dead? the tweeters would last longer anyway, IMO

 

i have a 91 before and the factory radio has an internal amp. I believe the factory radio with internal amp powers the front speakers while the back is powered by an individual small amp located on the speaker boxes at the back side panel.So maybe a radio with a separate amp powers the front speakers only too but i am just guessing. Sometimes, the connection of the speaker (full range-back side panel) becomes loose which happened to mine. You might want to check the connections of the speakers at the back side.

Did you use an aftermarket wire harness to connect your deck?

 

When I bought my truck it had a Craponeer in it so I promptly pulled it out to find somebody had scabbed into the factory harness with scotch locks. I cut it all out and had to start from scratch. I was never able to find the wires that went to the side speakers in the rear. All I could ever get to work was the rear tweeters. I ended up running splicing a wire from the tweets under the plastic to the side panels and running all 4 of the rear speakers off 2 channels on my deck.

 

The rear panel speakers have pre-amps, check them is all I can guess, pain in the butt to remove those huge panels though.

 

I installed an aftermarket head unit in my 94' with a matched wiring harness plug and had the same problem.
The rear tweeters will work but the rear woofers won't.
This is because the factory radio has an output to a preamp that needs to be triggered to turn the rear speakers on. The other problem is that the only way I could find how to get all my factory speakers to work with my aftermarket head unit required a jumper wire at one of the connectors, which works great but my power antenna raises up if i'm playing radio or cd's. Not a big issue for me as long as I have all my speakers working. So it is possible.
If I recall correctly, and someone hasn't been hacking wires in your rig. You have to blue connectors that plugged into your factory head unit. The larger one of them has a Pink wire/blue stripe. This wire needs a switched power source when the radio/cd player is turned on. Use a jumper clip from a known good 12+ power source and give that pink/blue wire some juice with your radio already on. I remember my rear speakers came on and scared the crap out me cause I wasn't aware they were gonna be so loud.
Once I found out that was the wire that wasn't getting any juice to turn the rear woofer preamp one I just tied it to the power antenna output on my new reciever/cd player.
I believe the factory radio has two internal switches. One turns the rear woofer preamp on...thats the pink/blue wire. The other sends power to the power antenna relay. I think the antenna issue could be overcome with a diode but I didn't go that far with mine...YET.

Chris