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head unit not functioning

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Old 07-28-2010, 10:05 AM
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head unit not functioning

i was working on installing a sony head unit in a 1987 4runner and i got it hooked up and working with the front speakers. i took it out and started putting on splices for the rear speakers. when i reattached the cd player it would no longer power up the display or anything, but it will take a cd and eject it as well. any ideas or help is appreciated
Old 07-29-2010, 07:54 AM
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bump for help all the wires are connected correctly and i have no clue what is going on all the fuses under the hood are fine and the fuse on the back of the head unit is fine too
Old 07-29-2010, 10:28 AM
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Sounds like constant power is still there. Check the ignition wire going to the head unit. The unit will still take CDs and eject them with the constant power attached.
Old 07-29-2010, 10:33 AM
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If you want, take a spare wire and run it from the positive on the battery and hook it directly to the yellow wire coming from the Sony. Or simply run a little jumper wire from the red wire to the yellow one and see if it turns on.

red: constant power
yellow: ignition
Old 07-29-2010, 10:45 AM
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thank you very much good sir that worked like a charm, now i just have to figure out what is up with the ignition wire
Old 07-29-2010, 10:51 AM
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Check your cigarette lighter, does it work?
IF NOT: Change your cigarette lighter fuse.
The head unit gets it's power through that fuse and loom of wire..
Old 07-29-2010, 10:54 AM
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if you don't mind where would that particular fuse be located?
Old 07-29-2010, 11:01 AM
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nevermind on the last question i had that kick panel off the other day and did not notice the fuse panel cover
Old 07-29-2010, 01:57 PM
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Drivers side under kick panel..
The fuse is labelled "Cig"
or uhh...
"Acc"
I dont remember.
Just check if your cig lighter works lol
Old 07-29-2010, 03:36 PM
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i got it fixed found the fuse replaced it then the player worked like a champ thanks for all your help guys
Old 07-30-2010, 11:39 AM
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Yeah no problem.
I had the same issue with mine, too, after i was in an accident
Old 08-02-2010, 04:57 PM
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kinda off topic but can eney body point me in the right direction to a good ipod capable head unit and good speakers bigger than stock that will fit in the stock location in my 94 ex cab pickup. i belive i will need 4. ive never started a system from scratch but all the trucks speakers are blown and shes got the stock AM/FM radio. thanks for the help
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