I recently purchased a JVC KD-R521 car stereo, was i have set the demo to off, clock set and radio stations programmed and turn ignition off it just goes back to factory settings. its driving me mad

first of all you must be able to check out a few things like do you know how to set your clock for the kd-r805. if you can check to see if you set your clock and set your presets for radio station to be saved. set your clock and set all your station presets once done. Once you have done that turn off the car wait about 60 seconds then turn your car back on to power up the radio and see what happens to your clock and presets . if your clock and presets are not still saved this means that who ever did the radio install has the yellow memory wire connected to switch ignition and not constant battery wire from the factory harness. have someone fix it. If the clock and station presets are still save then it was that you don't know how to program the clock.. how to program your model radios clock .......

STEP 1 : TURN ON POWER TO RADIO

STEP 2 : PRESS AND HOLD MENU UNTIL THE MAIN MENU IS SHOW ON RADIO SCREEN PRESS AND TURN THE VOLUME KNOB TO MOVE THROUGH THE MENU ( YOU MUST CANCEL THE DEMO FIRST TO BE ABLE TO PROGRAM THE CLOCK).
STEP 3: TO SET THE CLOCK SELECT THE CLOCK IN THE MAIN MENU SETTING ROTATE THE VOLUME KNOB AND PRESS IT ONCE TO SELECT THE CLOCK SETTING.

STEP 4: ADJUST THE HOURS AND THEN PRESS THE VOLUME KNOB TO MOVE ON TO THE SECONDS .
STEP 5 : THEN SELECT 12HR OR 24HR TO BE DISPLAYED
STEP 6 : RETURN TO THE PREVIOUS MENU BY HITTING (BACK BUTTON)
STEP :7 TO EXIT SETUP OR MENU HIT THE (MENU BUTTON)
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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

There is a misprint on manual concerning setting the clock. This is the case for similar JVC mobile head units.

The proper way to set the clock for this unit is:

1.)Hold down 'SEL' button count to 3 seconds
2.)Immediately after release of 'SEL' button hit the '>>|' button

This will allow you to enter 'PSM' menu. Every time you press '>>|' it will cycle between, 'CLOCK HOUR','CLOCK MINUTE', and 'Demo' Mode.

3.)Adjust settings by using the 'turn knob' and make sure 'Demo' mode is set to 'Demo Off' for the clock to stay set.

Hi, read instructions online for other JVC models as they have the same silly auto tuning function. Page 8 on this link. http://www.jvc.co.nz/assets/pdf-manual/KD-R406.pdf

IT IS STUCK ON DEMO AND CANT SET THE CLOCK

make sure radio is on and you press and hold sel (select) button
when you see demo release the select button(you might see other option if you have access the menu options). then press the forward button until you see clock h (hour). to adjust turn volume knob. then press the fast forward button again to get clock m (minute) and use volume knob again to adjust minutes. once you are done make sure to press select again to save the time.

Hey here is an instruction page for your clock.
http://resources.jvc.com/Resources/00/01/13/LVT1775-001B.pdf

press and hold the sel button....select an itenm (useing the silver button beside the volume dial).....then use the volume dial to adjust ,time , demo alot of others...then press sel button to finish.....this is straight out of the instructions...hope it helps you

hold down the SEL key and then scroll (TRACK FW or TRACK BW) to the Set Clock option. Then use the Up/Down arrows to set the time and hit Done.

Push the Sel button and hold for 3 seconds (usually displays Demo or Demo Off). Push the Station up and down button til it reads Clock H or Clock M. Turn the volume button to adjust time. Push the Sel button to quit.