Reconnecting a battery...

AylmerQc · Post by **AylmerQc** » 01 Nov 2022, 21:35

The owner's manual doesn't really give special instructions for reconnecting the car battery except afterward to lock and unlock the doors a number of times with the remote. Yet I've read a number of times about the need to put the key in position II before hooking up the battery cables.
The articles or comments about having the key in pos II mention something to the effect of avoiding damaging some modules. If that's the case, does anyone know how it prevents the damage to the modules and why Volvo didn't include that in the owner's handbook...

Post by **br0dy519** » 01 Nov 2022, 22:39

I suspect it is a safety feature more than the theorized component protection. If airbags deploy due to some sort of SRS work being done incorrectly, you’re well out of harm’s way.

I still follow the urban legend religiously and connect it in pos2, but I doubt it is absolutely necessary.

Post by **abscate** » 02 Nov 2022, 02:09

br0dy519 wrote: 01 Nov 2022, 22:39 I suspect it is a safety feature more than the theorized component protection. If airbags deploy due to some sort of SRS work being done incorrectly, you’re well out of harm’s way.

I still follow the urban legend religiously and connect it in pos2, but I doubt it is absolutely necessary.

I believe guru jimmy confirmed the above.

AylmerQc · Post by **AylmerQc** » 02 Nov 2022, 07:09

OK, thanks.
I see the subject of replacing the little thermistor in the climated module gets a lot of ink online, some have "suggested" I guess, that it got damaged by connecting the battery without having the key in POs II.
I do hope it's just a myth as I've disconnected/reconnected the battery on my XC70 quite a few times recently, and didn't do the key thing...

Post by **volvolugnut** » 02 Nov 2022, 08:05

I started disconnecting/connecting battery without the Position II process long before I read about need to use Position II for removal/connection. I have never had a problem ignoring Position II.
I always disconnect negative cable first and connect negative cable last. This process is also recommended on my Mercedes and Smart cars.
volvolugnut

Post by **br0dy519** » 02 Nov 2022, 09:01

AylmerQc wrote: 02 Nov 2022, 07:09 OK, thanks.
I see the subject of replacing the little thermistor in the climated module gets a lot of ink online, some have "suggested" I guess, that it got damaged by connecting the battery without having the key in POs II.
I do hope it's just a myth as I've disconnected/reconnected the battery on my XC70 quite a few times recently, and didn't do the key thing...

I think that's more of a physical wire break issue that happens when people try to clean out that little vent. I have stock of those if you ever need one.

93SCMax · Post by **93SCMax** » 02 Nov 2022, 10:49

This is the correct way to disconnect/reconnect a battery. Credit Howard's Volvo website.

https://howardsvolvos.webs.com/miscissues.htm#207347288

Archer · Post by **Archer** » 02 Nov 2022, 10:50

I forgot to put in position II when reconnecting battery in my 2002 V70 T5...fried the CCM.

AylmerQc · Post by **AylmerQc** » 02 Nov 2022, 16:05

Did you need to put in an entirely new CCM or were you able to repair it?

Archer · Post by **Archer** » 02 Nov 2022, 18:17

Had to replace it, sourced one from Erie Volvo Parts.