Re: system was working fine and now there's no sound, but...
Unplug the wiring harness at the point of connection to the harness coming up from the car. (Its blue to white connection) It will reset everything and sound will come back. I've done this before so your not alone.
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Un hook all your speakers that the deck is powering and hook them up one by one sounds like u have a shorted speaker or wire and the unit is going into protection.The best way to chk the speakers and wires is with an ohm meter . Check each speaker wire to ground and across the speaker and see iof you have any shorts. The next step woulk be to remove the unit and have it bench tested.
you have one of your speaker wires shorted out to the body of the car somewhere, or the speakers that you installed are bad. That is the only two reasons it will go into protect. Correct the problem, then reset the deck - it should work fine.
Kenwood builds this feature in to protect the outputs - so they dont burn up in the case of shorted speakers or wiring.
the alpine should recognize it as a "changer" when you select the source; ie: radio, CD, changer. Sounds simple, but have you turned up the volume on the iPod?
The Alpine adapter is $100, but works great, you can totally control all your iPods functions, and it displays all song info on the Alpine decks display.
Some 4-Runners have a factory system that uses a separate amplifier to power the rear speakers. In this case you need to activate the amplifier using the blue/white remote output from your Alpine deck. It sounds like the wire that activates the amplifier is currently attached to the deck's blue "power antenna" output, so that the amplifier is only on when the tuner is selected.
Disconnect whatever is attached to the blue wire behind the deck, and attach it to the blue/white wire instead. That should solve the problem.
It's possible that you have a shorted speaker wire. If one of the speaker wires is pinched, grounded or shorted it will cause the deck's internal amplifier to shut down. The easiest way to check is with a multimeter's resistance function.
Remove the CD player and unplug it. Set your multimeter for "resistance" or "continuity". Attach the black probe to chassis ground; you can use the black ground wire in the deck's harness, clean dash metal, or the outer ring of your cigarette lighter. Use the red probe to test each of the speaker outputs in the harness: white, gray, green and violet. If you find a speaker wire that shows any continuity with chassis ground, then that's the cause of the problem.
A speaker with a damaged voice coil may also cause the deck to shut down. To test this, probe the positive and negative leads of each speaker and test the resistance between them. For example, to test the left front speaker you'd put the red probe on the white wire and the black probe on the white/black wire. Each speaker should read a minimum of 3 ohms of resistance. If you get a lower reading then it might be causing your problem.
If you don't find a problem with any of the speaker wires, then chances are the deck's internal amplifier has failed.
If you remove the unit from the dash the top, take off the top cover, no screws you can acess the CD slot. Remove the 4 screws holding the CD player in place and the ribbon cable and you should be able to remove the CD from the slot.