Radio persets after battery change
 

Not sure where to put this, but this looked like as good a place as any, mods move as you like.

Anyway, my baterry is now 7 yrs old and needed to be changed, so got the battery and changed it (have got to say it was the easiest battery I have ever changed, cleanest also). After changing the battery, naturally I need to see if it will start and I'm also expecting to have to reset all my radio presets, but when I turn my key on, all my presets are still there, they didn't all clear like I have seen with other batteries I have changed before. The only reset I had to perform was the "tire pressure" alarm setting.

Now I have my theories; small capacitor that holds a slight charge for a short period of time or there is a ROM chip in the unit that has memory. I might add that the radio/cd player is OEM, came with the car.

Any thoughts.

cajun

That theory is as good as any. I've replaced a battery, and had it disconnected for various reasons, and it held the station memories. The time, however had to be set. I hadn't delved into the reason.

There is some residual power that lingers.. you moved fast enough and got lucky. ;)

The 94+ Bonneville stereos all retain the station preset no matter how long you dissconnect the battery... Its set in memory and does not require any power to retain the station preset... But you will have to reset the clock..

On the 87-93 stereos this is a different story...LOL

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I had my stock HU out for 20 minutes the other day and i to went WTF when everything was the same.

I was not so lucky. I had let my battery partially run down once while working on my 2000. It was in an accident, sat for a couple weeks, and I opened doors & trunk a lot.

When I tried to start it again, I didn’t realize battery was drained that much. I turned the key and it did the typical repetitive starter solenoid clicking with courtesy lights dimming. The radio was on when I did this.

After re-charging battery, all pre-sets were cleared. Now the pre-sets don’t work properly. You can program them all OK but after awhile, some of them will loose the setting and start seeking once you hit the button.
I think display says “AF SEARCH” while it is seeking.

I’m guessing there must have been a voltage spike.