Question about Kenwood KDC-X493 Car CD/ MP3 Player

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The yellow wire doesnt work

I checked my fuse and the red wire works but when i turn the radio off and turn it back on all the setting have been reseted. the yellow wire is not working how do i fix it! but when i put the yellow and red wire together the radio works. but if i just run them like red to red and yellow to yellow it doesnt work. please help email me mr.gs_09@hotmail.com

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  • 306 Answers

Probally have a bad fuse in the fusebox. check there first.

Posted on Feb 07, 2010

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Posted on Jan 02, 2017

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Firstly check the radio fuse in the fuse block. If that is OK gain access to the rear of the radio and see if you have 12volts on the yellow wire and the red wire. the red should have 12 volts all the time and the yellow should come on when the ignition is turned on. If they both have the correct voltage, then the problem is inside the radio.If they do not have the correct voltage, then you need to check the wiring, for this you really need a circuit diagram or a vehicle electrician.

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You could start by checking all fuses. If you bought an aftermarket radio and a harness, the yellow wire should be hot at all times.. The red wire gets power with the key. Use test equipment to see if these wires are getting what they are supposed to. If not, you will need to figure out why. It can be difficult to trace wires back because they are wrapped in a harness at the factory. Worse comes to worse, run a new wire to replace a non working one.

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Make sure the yellow wire is going to a source that still has 12v when the key is turned off. The yellow wire controls the memory and needs to be connected to a constant power source.

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Put a multi meter or test light on the red wire and separately the yellow wire. You should get constant 12v on the yellow wire and ignition switched 12 volts when the key is turned on the red wire. If one isn't working properly check the respective fuses. Also make sure your radio is grounded properly. Sounds ground pins in car radio harness run to know here on the back end of the harness.

I’m happy to help further over the phone at https://www.6ya.com/expert/chris_7f7f91eb941fb23f

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If you mean the radio doesnt retain the memory presets and clock when you shut the car off or turn the key to the 0 position

that could mean that the yellow wire was not connected to the red or hot/positive lead when the radio wiring harness was connect

if this worked before and now it does check the main fuse box
also some radios have a inline fuse connected on the radio wiring harness (behind radio so you'll have to remove it to check, same thing with checking that the yellow wier is connected)

not sure what you mean by "electrical problem headlights"
some cars shut off the electrical current to the head lights (only power to running/park lights) when the ignition is shut off or the key is at position 0

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you need to hook the yellow wire off the back of the radio up straight to the battery this keeps memory power to the head unit then wire the wires in color coded sequence red to red black to black so on and so forth if this doesnt fix it you might want to think about replacing head unit

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first red is ignition or acc (turns off and on with the key) yellow is constant power (always hot keeps memory) orange is illumination (lights up radio) if vehicle doesnt have a seperate illumination wire connect it to the ignition wire. now process of elimination your ground is correct because it worked with all wires to acc your acc works because u had all them connected to it and it worked your problem is in your yellow or constant/memory i suggest u test it again take piece of wire any old thing long enough will do and run the wire directly from the battery under the hood and just run it outside the car through the window and connect it directly to the yellow wire make sure u have a good connection at the battery on the positive side if u have test light or volt meter test the wire before connecting it to the radio if it works then u know there is a problem with the wire from the vehicle (fuse wrong wire bad wire ) if it doesnt work make sure ground is connected tight and that paint is cleaned of the surface where ground connects and that the yellow wire to the radio is tight in the back of the radio.

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