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Hello all,
Sorry for a silly question, but need to know the exact answer before going ahead to have the dashboard removal for replacing the ac evaporator which I will take a long time to play with.....
Is it ok to have the main battery disconnected for a month or longer? If not, any resetting or programming is needed when reconnecting the battery?
I have not done it but probably you would need to reset such things . I don't exactly know what they are involving in those items . Windows , memory related things like seats, mirrors . I have heard that 3 weeks won't discharge your battery because Mercedes-Benz models unlike other car manufacturers (most of them to be exact ) are not battery enemies but 4 weeks is a bit steep to me as well
Don't worry, only the clock will need to be set. The rest no memory loss, if only a month. I done 30 days battery disconnected already.
You will/may get DTC, but stored ones. This is from booting up speed not the same between modules and when say AA modfule expect X module to report but X module has not boot up in time,
DTC u get by other modules reporting on X module beinf OFFLINE.
When you unplug it - it does not know how long it is unplugged for (assuming both batteries are gone). They go into an imaginary state of being, much like a computer in a box. Plug it back in, it is reborn. The car does not know if it was with out power for one hour, one day one month or one year.
When you unplug it - it does not know how long it is unplugged for (assuming both batteries are gone). They go into an imaginary state of being, much like a computer in a box. Plug it back in, it is reborn. The car does not know if it was with out power for one hour, one day one month or one year.
I am certain that my 30 year old Jeep behaves this way, but I have no idea how my G550 would act without battery power for a month. Even a computer in a box has a battery backed real time clock calendar that continues to run while packed away. A question for the OP is how did your service indicator react? If it indicates pre-surgery that you have 180 days until your next B service, what does it say post-surgery when you reconnect the battery? Will it still be 180 days or 150 days? Looking forward to a follow-up on this.
Even a computer in a box has a battery backed real time clock calendar that continues to run while packed away.
3
Not in my world...we typically will pull that as well for our spares. You set the BIOS clock and off you go. But, yes.
On my C240 some years ago it had no battery for almost seven months (in storage waiting to move). Plugged it in (the battery), started the car, drove away.
Here is what I found out in 2021 when I checked service days per ECU, vs actual car ownership.
After 2021, there are many more days when I disconnected the battery in 2022 and 2023.
I will update it next time.
Some vehicles, probably not the W212, will have to re-calibrate the windows (very simple) and the steering angle sensor (simple, full lock each way), others might have airbag messages. This is generally not an issue especially with vehicles that have an aux battery I think.
Some vehicles, probably not the W212, will have to re-calibrate the windows (very simple) and the steering angle sensor (simple, full lock each way), others might have airbag messages. This is generally not an issue especially with vehicles that have an aux battery I think.
you need to disconnect AUX or else it will get flat quick.
Time clock is reset automatically by the free reception of GPS SATTELITES tics.
MY'14 W212 facelift retains all normalizations... reboots are a much needed walk in the park.
Thanks all for your advice.
My worry is just that: I could not start my car or drive it away after a month of battery disconnection.....
Now, I clearly know that I should have no worry, and could keep going ahead of my evaporator changing project.....
Thanks buddies.....
Thanks all for your advice.
My worry is just that: I could not start my car or drive it away after a month of battery disconnection.....
Now, I clearly know that I should have no worry, and could keep going ahead of my evaporator changing project.....
Thanks buddies.....
One month is totally fine even when left plugged in but I understand you want to unplug it.
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