What to consider when removing battery? (1 Viewer)

[rtong1234]

I need to remove my LC200 battery to gain access to my low and high beam bulbs. How do I prevent losing settings or functionality when I reconnect the battery? I once simply replaced a battery on a german car and I had to do a bunch of crazy resets afterwards. Thank you in advance for your insights.

 

[OregonLC]

Not 100% sure, but there are ODB-II devices that keep the ECU memory happy that may work. If not that, you could always have a shore power charger hooked up to the cables prior to the disconnect. Just need to be super diligent on not letting them touch anything.

 

[bloc]

It’ll start and die once, then just start it again then it should be fine.

Window force limits for auto function.
The steering angle backup lines will take a while to initialize.
Don’t do it just before an inspection, it resets the OBD monitors and fuel trims and these take a while to set and stabilize.
Slightly wonky mileage and possibly transmission shifting.

I’m probably forgetting stuff.

 

[KLF]

I bought one of those things that lets you backfeed the electrical system through the OBD port. Didn't work. Maybe there's a diode blocking it.

You definitely can't do it though the cig lighter plug, since it relies on a relay being energized.

Put the windows up, close the sunroof. You'll lose the radio and seat memories. Can't think of anything else. The clock will fix itself.

 

[scottm]

Battery jump start pack hooked to battery terminals while the battery is out? Should last a few weeks maybe a month.

 

[MikeVpdx503]

Although not recommended, it is very easy to swap out the high/low beam bulbs without disconnecting the battery. I was able to move my battery 2-3” while connected and move the wiper fluid fill to get enough room to get to the HID low beam assembly and swap the bulb. Halogen high beam is even easier. I chose to do it with the battery connected and accept the risk to avoid the reset hassle.

 

[TheIcemanCometh]

Just placed my battery. Engine will not start until one closes the doors, locks and unlocks them, then press the start. Or something like that - it is in the owner's manual. Radio and other preset remain.

 

[rlynch356]

Yeah, did this a bit ago... remove and replace battery (and what ever in between).. shut everything and start it up.. mine did not don't die on first start after I changed the battery... so basically was a non-event, clock reset and frankly didn't notice anything.

 

[AnyMal]

It’ll start and die once, then just start it again then it should be fine.

Window force limits for auto function.
The steering angle backup lines will take a while to initialize.
Don’t do it just before an inspection, it resets the OBD monitors and fuel trims and these take a while to set and stabilize.
Slightly wonky mileage and possibly transmission shifting.

I’m probably forgetting stuff.

FSM Asks for steering wheel 360 sweep, although its not even a proper zero point calibration.
Not doing it did nothing noticeable either. But i still do it. That may be the backup lines you brought up though that I never noticed…

Temp/climate setting, last used media source, custom drive mode will be reset.

The custom drive mode one took me a while to figure out.

 

[rtong1234]

Although not recommended, it is very easy to swap out the high/low beam bulbs without disconnecting the battery. I was able to move my battery 2-3” while connected and move the wiper fluid fill to get enough room to get to the HID low beam assembly and swap the bulb. Halogen high beam is even easier. I chose to do it with the battery connected and accept the risk to avoid the reset hassle.

Thank you for your suggestion of not removing the battery altogether. I moved things around like you suggested and it was much more manageable to access the bulb.

 

[pvchaitanya]

This should not be a problem at all. I disconnect my battery intentionally everytime I do major work such as cleaning up MAF sensor, transmission oil flush etc so the engine mapping resets and recalibrates again.

Like someone said, it takes 1 try for engine to stop and next time you try to do a a turn off and start again, it will start normal.