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Press and hold 'SEL' button. DEMO is displayed. Use the up or down to select an item. Turn volume knob to set/adjust. The clock is next after demo. set hour then minute press SEL to finish. Reference page 3 in this link to JVC for your KD-S13 CD Receiver Instructions. http://books.jvc.com/Download/975469902/GET0400-001A.pdf
Two questions to narrow this down - one, is it an aftermarket stereo, or a factory one? Two, with the key out of the car, can the stereo be turned on?
If it's aftermarket and it powers on when the key is off, then it's likely two wires are reversed in the harness behind the deck - the constant 12v wire and the switched 12v wire. The constant one is the yellow one, which always supplies power to the deck, keeping power there for the preset memory and the tone settings. The ignition-switched one is so that when the key is turned off, the stereo shuts off (this is the red wire on the harness). If these were reversed, the stereo would always be able to be turned on, and power to the memory settings would be lost when the key is turned off.
My bet is that the reason you loose the setting every time the key is turned off is because you have no constant power going to your yellow wire. With the power on major brands of cd players there are 3 "power" wires. One is black which is ground, one is red which is the accessory power, this is only on when the car is on, and the last one is the yellow which is constant which stays on all the time so that your cd player can keep settings. Good luck. Let me know if you need more help.
i removed my car stereo and put a new one in, i didnt like the new one so i put the old one back in, but since i did this it wont store radio stations! why??? all the wireing is the same the fuses are all ok, so whats changed???
Most stereos have two power connections. One is "constant" (aka always connected to +12V) and the other is switched on/off by the ignition. They may go be various names. The idea is that the constant +12V keeps the stereo from losing all of the settings while the switched power turns the stereo off when the key is not on "start" or "accessory". It sounds like the both connections may be made to the switched power on your car, causing it to go completely powerless when your car is off.
Are the presets reset after you turn the car off or only after you turn your car back on? If they only reset after turning the car back on, it's possible the battery and/or electrical system is having trouble keeping the system voltage up while the starter is trying to turn the engine.
The illumination signal is usually used to let the stereo know when you've turned your headlights on, so it can dim the display automatically. Should be completely separate from your issue.