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Battery disconnect?

Discussion in '3rd Gen. Tacomas (2016+)' started by AZDuck97, Apr 8, 2016.

  1. Apr 8, 2016 at 8:46 PM
    #1
    AZDuck97

    AZDuck97 [OP] Active Member

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    Does disconnecting the battery wipe all the settings on the stereo or is there some sort of secondary battery backup that will retain them for awhile? Just curious if I need to document my preferred settings and such. Thanks!
     
  2. Apr 8, 2016 at 8:49 PM
    #2
    95 taco

    95 taco Battle Born

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    Removal of the battery cables will indeed wipe the radio presets and EQ settings.
    If you have access to jumper cables and another vehicle or a jumper box you can keep power to the electronics so you don't lose your settings.
     
  3. Apr 8, 2016 at 8:54 PM
    #3
    AZDuck97

    AZDuck97 [OP] Active Member

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    Ok, thanks!
     
  4. Apr 8, 2016 at 9:00 PM
    #4
    Rufus

    Rufus Well-Known Member

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    There is a 9V battery device that plugs into the lighter socket. Turn the ignition key to acc. before unplugging the battery and it'll save the settings. It's only a few bucks. Check your local auto parts store.
     
  5. Apr 8, 2016 at 9:51 PM
    #5
    MoQS

    MoQS Well-Known Member

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  6. Apr 8, 2016 at 9:55 PM
    #6
    Markc1024

    Markc1024 Well-Known Member

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    I've pulled the unit out and disconnected the battery. Only thing lost was the time.
     
  7. Apr 9, 2016 at 4:29 AM
    #7
    Lawfarin

    Lawfarin Well-Known Member

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    If you even need to change a battery and want to retain your settings if they didn't wipe from the battery dying simple start or jumpstart the vehicle, and disconnect the battery and replace it with it running.
     
  8. Apr 9, 2016 at 5:13 AM
    #8
    13mgm4X4

    13mgm4X4 Well-Known Member

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    Disconnecting the battery does not erase anything on the radio. I just disconnected my battery for a half hour and when I hooked it back up everything preset on the radio was still there.
     
  9. Apr 9, 2016 at 5:29 AM
    #9
    motomaster132003

    motomaster132003 Well-Known Member

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    Just resets your trips, and fuel economy. Doesn't reset anything on the radio.
     
  10. Apr 10, 2016 at 10:44 AM
    #10
    over60

    over60 Over70 & still a "Grumpy Old Guy"

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    ^^^^This...
     
    Pinche_tacos likes this.
  11. Apr 10, 2016 at 10:46 AM
    #11
    Aussiek2000

    Aussiek2000 Well-Known Member

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    Good way to fry an ECM
     
  12. Apr 10, 2016 at 3:13 PM
    #12
    Lawfarin

    Lawfarin Well-Known Member

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    Explain that one
     
  13. Apr 10, 2016 at 3:15 PM
    #13
    Aussiek2000

    Aussiek2000 Well-Known Member

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    Battery acts as a buffer for charging voltage. It's common to have a voltage spike if you unhook then battery while an engine is running and fry one or multiple computers.

    I've put quite a few computers that customers did this to
     
  14. Apr 10, 2016 at 3:19 PM
    #14
    File IFR

    File IFR "... Intercepting The Localizer"

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    Why would it fry the ecm? You're still feeding 12v through the battery leads from another source.

    I think you're confusing the source to be a 'charge' vs. a 'power supply'.
     
    Lawfarin likes this.
  15. Apr 10, 2016 at 3:21 PM
    #15
    File IFR

    File IFR "... Intercepting The Localizer"

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    So, quite a few of your customers changed their batteries while the engine is running? Where in the USA is this happening?
     
  16. Apr 10, 2016 at 3:24 PM
    #16
    Aussiek2000

    Aussiek2000 Well-Known Member

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    I'm just telling you what can happen. Not really in the mood to argue. My truck runs
     
  17. Apr 10, 2016 at 11:31 PM
    #17
    2016BBP

    2016BBP Well-Known Member

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    When I added a 2nd battery I disconnected the existing battery for about an hour, I did not lose anything.
     
  18. Apr 11, 2016 at 3:22 AM
    #18
    Shaunsquatch

    Shaunsquatch Well-Known Member

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    Its called "load dump"
     
  19. Apr 11, 2016 at 4:23 AM
    #19
    Lawfarin

    Lawfarin Well-Known Member

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    I've never seen or heard of an ECM, ECU, BCM, ect frying because of that. Seen a lot of guys change batteries at our dealerships like that so the customers settings aren't lost. Plus almost every person at auto zone and other parts stores tell their customers that's how you test for a bad alternator. Do you know how many tow ins you would have if that was true? Voltage spikes can happen any time and will happen if you have a battery or not. When Stators start going bad in the alternator the voltage increases. This can be dangerous but I still haven't seen that fry a computer. Seen some that were putting out around 18v
     
  20. Apr 11, 2016 at 3:10 PM
    #20
    File IFR

    File IFR "... Intercepting The Localizer"

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    You confused my question with an argument. I just asked you to confirm that you had quite a few customers change their batteries with the engine running.... as a result they needed a new ECU installed by you.

    I'm sure your truck runs too. :thumbsup:
     
    Last edited: Apr 11, 2016

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