Changing Battery

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Senior Member
Did anyone use any memory savers or special procedures to change out 12v battery without loosing memory presets?
 
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Someone else confirm, but I believe if you change it over within a reasonable time you won't loose anything.
 
Are we talking seconds or minutes?
It is possible to:
a) disconnect negative terminal
b) disconnect positive
c) lift old battery out
d) place new one in
e) connect positive
f) connect negative
all that under 40 seconds or little faster in mad dash
 
<<<< said:
Did anyone use any memory savers or special procedures to change out 12v battery without loosing memory presets?
Click to expand...

I can't be 100% because I wasn't paying attention to presets, but thinking back, I am pretty sure I lost no preset info when I switched batteries, and the battery was out at least an hour. I think I had to reset the clock. But if you mean radio presets, etc., I did not need to reset any of those.
 
familymopar said:
I can't be 100% because I wasn't paying attention to presets, but thinking back, I am pretty sure I lost no preset info when I switched batteries, and the battery was out at least an hour. I think I had to reset the clock. But if you mean radio presets, etc., I did not need to reset any of those.
Click to expand...

This. I took a couple hours to install some fog lights and my presets were still there when I plugged everything back in.
 
Removed my battery from truck for several minutes during my HID install. Was disconnected for about 10 minutes and didn't lose any radio presets or bluetooth pairing info. Did lose the mpg, trip odometers, and apparently learned ECU/shift behavior.
 
<<<< said:
Are we talking seconds or minutes?
It is possible to:
a) disconnect negative terminal
b) disconnect positive
c) lift old battery out
d) place new one in
e) connect positive
f) connect negative
all that under 40 seconds or little faster in mad dash
Click to expand...

...At least 1 to 2 hours! I've disconnected my battery to perform a 'Master Reset' regarding the Main body ECU Compu Network to straighten out an electrical issue that I was needing to eradicate. After waiting for about two hours I naturally reconnected the battery, only to discover that nothing had changed; even the clock, the compass, and the radio presets were still set the way I had set them! One to 2 hours should be plenty of ^x to swap batteries if you need to!

If you feel you need more time, connect a set of jumper cables from another vehicle and connect the POS lead to the alternator B OUTPUT TERM, and the NEG jumper lead to a suitable ground on the engine; that will preserve your ECU's memory indefinitely!

cheers
 
Doing some prep will save you some time. Get all the tools and the new battery ready to go. Run through how you're going to do it.
 
Tripmeter, MPG, and clock will be off.

Everything is stays put. If you're worried about it, just take a picture of all the presets.
 
This is what I like to call a "Teachable Moment"...

Those of you who may know me may have seen threads where I have advised a member or visitor to either, disconnect the negative battery terminal or to pull a related fuse for "A MINIMUM of FOUR HOURS"! And this is a great example of the reason. The engineers at Toyota have put in place a 'Fail-Safe' circuit; a clock that allows their technicians to test, investigate, and analyse a customer's vehicle with an issue without the need to remember to reset the radio presets, perform a 'Circling calibration' for the compass (page 477 in the 2012 owners manual), or even to remember to adjust the clock!

So this is why ('at the risk of sounding like a broken record') I always suggest that the person with an issue disconnect for an extended period of time! One last thing... be sure to drive safely :beer:, keep family and loved one's first :hug:, and be blessed this week during these upcoming Holidays folks! :tea: 'Best to you',

rig
 
I think 10 seconds is all you got and if you don't reconnect in that time the self destruct sequence commences...
10
9
8
7
...
 
Are radio presets really an issue to lose...?

Can't remember when that even crossed my mind taking my battery out.

That's just me I guess...
 
rigtec said:
This is what I like to call a "Teachable Moment"...

Those of you who may know me may have seen threads where I have advised a member or visitor to either, disconnect the negative battery terminal or to pull a related fuse for "A MINIMUM of FOUR HOURS"! And this is a great example of the reason. The engineers at Toyota have put in place a 'Fail-Safe' circuit; a clock that allows their technicians to test, investigate, and analyse a customer's vehicle with an issue without the need to remember to reset the radio presets, perform a 'Circling calibration' for the compass (page 477 in the 2012 owners manual), or even to remember to adjust the clock!

So this is why ('at the risk of sounding like a broken record') I always suggest that the person with an issue disconnect for an extended period of time! One last thing... be sure to drive safely :beer:, keep family and loved one's first :hug:, and be blessed this week during these upcoming Holidays folks! :tea: 'Best to you',

rig
Click to expand...


This "sustain 4 hour electrical current feature" was not installed on my '06 Avalon.

What year was this first made available on Toyota models post 2006?
 
1) Start your engine
2) open hood
3)loosen and remove battery tie down
4) loosen battery terminal clamps
5) remove battery clamps and old batter
6) install new battery and reinstall clamps and tie down
7) drive away
 
Lester Lugnut said:
This "sustain 4 hour electrical current feature" was not installed on my '06 Avalon.

What year was this first made available on Toyota models post 2006?
Click to expand...

I can't say just when that substantial ECU power storage circuit was established but I know all of out Gen-5 4Runners are equipped with that 'Safety/Convenience' feature Lester! ...kinda nice to have a back-up just in case you need to disconnect a fuse or battery for an extended period of time!

Cheers!
 
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