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Change Battery without loosing memory?

Old 12-14-2018, 12:38 PM
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Bucks Centennial
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Default Change Battery without loosing memory?

Question. If I use the factory battery maintainer plugged into the outlet while I chance battery in my Convertible C7 will I maintain my memory or do I have to buy a memory minder? Thanks for any input from someone who knows.
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Old 12-14-2018, 12:42 PM
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KenHorse
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Which memories?
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Old 12-14-2018, 12:47 PM
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Bucks Centennial
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Seats, radio, etc. etc
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Old 12-14-2018, 12:50 PM
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KenHorse
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Originally Posted by Bucks Centennial View Post
Seats, radio, etc. etc
Radio memories are non volatile I believe but you will have to redo seat memories, window indexing, etc
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Old 12-14-2018, 01:19 PM
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I had to reconfigure the Driver Information center (DIC) settings as far as my default views. Also some Infotainment settings had to be reset. Others I had set were not changed. Go figure. Some have reported that nothing changed.
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Old 12-14-2018, 01:30 PM
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A lot of flash memory in the C7 , just like the C6. The only one you should lose is the window indexing, easily fixed.
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Old 12-14-2018, 01:41 PM
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They make a cheap thing that plugs into the cigarette lighter that will retain the memory. The charger that plugs into the lighter probably will work also
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Old 12-14-2018, 01:48 PM
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When I changed my battery, I only had to reindex the windows. Absolutely no need to do anything special. My battery was disconnected for over an hour.
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Old 12-14-2018, 01:49 PM
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Originally Posted by C7-Vette View Post
A lot of flash memory in the C7 , just like the C6. The only one you should lose is the window indexing, easily fixed.

I agree. Won't lose jack changing out the battery but you will need to re-index the windows.

Elmer
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Old 12-14-2018, 03:17 PM
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I have a typical 9-volt (battery equipped) "memory" maintainer that plugs into a fulltime-on (rear on the C7) "cigarette lighter" plug.

Though I have not had the need to use it on the C7 I have used it many times on other vehicles including recently on my C5... again. I don't have a picture of the thing but I'm sure it was originally from Walmart. I would, however, suggest that if anyone has one of these and have had it for a long time, I'd check the voltage of the 9-volt battery each time before using it.

Btw, it works exactly as advertised. All the best.
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Old 12-14-2018, 04:35 PM
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i have a snap on memory saver EESM500 ,,, it is worth every penny, especially if you live where you get E checked, you wont lose any codes if you need to disconnect or change battery.

below is a link

https://www.ebay.com/p/Snap-on-EESM5...1738677&chn=ps
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Old 12-14-2018, 04:47 PM
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Originally Posted by Bucks Centennial View Post
Question. If I use the factory battery maintainer plugged into the outlet while I chance battery in my Convertible C7 will I maintain my memory or do I have to buy a memory minder? Thanks for any input from someone who knows.
Okay, let me try again. What I am asking is if the $100 option Battery Maintainer that came with my C7 will keep voltage to the various instruments that need it while I am changing out the battery?? Has anyone changed a battery while using the GM supplied battery maintainer? If so, what was the result? Did you have to reset any of the functions like window indexing, seat, etc. or did they stay set as they were?
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Old 12-14-2018, 04:52 PM
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Why worry about losing everything, you won't. If you "save" having to re-index the windows, this is what you save.

Window Indexing and Express-Up Reset
Window indexing may be required if the vehicle battery has been recharged or disconnected, or is not working. Express-up and the convertible top will not function until the windows are reset. After battery power is restored, a message or code displays in the Driver Information Center. See Driver Information Center (DIC) on page 5-23.

Once power is restored:
1. Close the doors.
2. Start the vehicle.
3. Put windows down
4. Raise each window and hold the window switch up in the fully closed position for a few seconds after the window is up.


Elmer
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Old 12-14-2018, 04:52 PM
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If the "9 volt memory keeper" in the trunk power port will keep everything the battery maintainer should do the same thing for you.
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Old 12-14-2018, 07:52 PM
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Originally Posted by Bucks Centennial
Okay, let me try again. What I am asking is if the $100 option Battery Maintainer that came with my C7 will keep voltage to the various instruments that need it while I am changing out the battery?? Has anyone changed a battery while using the GM supplied battery maintainer? If so, what was the result? Did you have to reset any of the functions like window indexing, seat, etc. or did they stay set as they were?
Starting to sound like no one knows the answer you are looking for. For the benefit of others that may come across this thread, if you try it, please post the results.

Yea, easy to read-index windows and fix other stuff, but if you didn't have to by plugging something in that you already have, even easier.
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Old 12-14-2018, 09:30 PM
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Start the car and leave it running while you change the battery
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Old 12-14-2018, 10:50 PM
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I have heard that doing that can kill the alternator on these new vehicles. I have replaced an alternator and the instructions that came with the alternator said specifically that the battery had to be at least 50 percent or alternator death could occur.
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Old 12-14-2018, 11:11 PM
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Attach a jump Box to the cables, disconnect from the battery while the jump box is turned on. That should provide enough power to your system while you change the battery out.

Ken
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Old 12-15-2018, 12:29 AM
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Originally Posted by mountainears View Post
Starting to sound like no one knows the answer you are looking for. For the benefit of others that may come across this thread, if you try it, please post the results.

Yea, easy to read-index windows and fix other stuff, but if you didn't have to by plugging something in that you already have, even easier.
At least a couple people have already answered correctly.

You will lose nothing but window indexing (maybe); no presets whatsoever. Mine has been disconnected a few times, and only has needed re-indexing about 50% of the time. Seats, mirrors, radio were never affected. Also: re-indexing window ~3 seconds, hooking up something = much more time.
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Old 12-15-2018, 02:54 PM
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Originally Posted by eboggs_jkvl View Post
I agree. Won't lose jack changing out the battery but you will need to re-index the windows.

Elmer
With one caveat--if you live in a vehicle inspection state, don't do this immediately prior to needing an inspection because the ECM while return a number of "not ready" codes when the battery is disconnected.

I had my 2015 in because the HVAC actuator went bad, and for an inspection at the same time. Instead of doing the state inspection first, they changed out the actuator, disconnecting the battery (of course) in the process, and could not do the inspection after that. Had to drive it for a day or so and bring it back. Also, for some reason and I'm not sure why, I also lost the outside temperature reading on the first go around (don't know if that was due to the battery being disconnected or them updating the software).
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