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Battery Disconnect Procedure


JesterKB

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I was reading a thread here while just cruzing and they started talking about the procedure for disconnecting a battery. I did my Daughter's 98 S70 to replace the battery, and I guess got lucky. The car had been shut off for hours, and all I did was disconnect and reconnect, in less than a minute. The only consequence was the radio code (which we had). Should I have followed a specific procedure, and if so what is it? I searched several times on different key word combinations, but couldn't find it. I service her S70 and I own a 2001 V70 T5a. Would the procedures be consistent for most Volvos?

Jerry

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I was reading a thread here while just cruzing and they started talking about the procedure for disconnecting a battery. I did my Daughter's 98 S70 to replace the battery, and I guess got lucky. The car had been shut off for hours, and all I did was disconnect and reconnect, in less than a minute. The only consequence was the radio code (which we had). Should I have followed a specific procedure, and if so what is it? I searched several times on different key word combinations, but couldn't find it. I service her S70 and I own a 2001 V70 T5a. Would the procedures be consistent for most Volvos?

Jerry

When installing a battery in an '01, you MUST turn the key to position II before you connect the battery. Failure to do so will detonate your AC control panel. (Ask me how I know...)

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I was reading a thread here while just cruzing and they started talking about the procedure for disconnecting a battery. I did my Daughter's 98 S70 to replace the battery, and I guess got lucky. The car had been shut off for hours, and all I did was disconnect and reconnect, in less than a minute. The only consequence was the radio code (which we had). Should I have followed a specific procedure, and if so what is it? I searched several times on different key word combinations, but couldn't find it. I service her S70 and I own a 2001 V70 T5a. Would the procedures be consistent for most Volvos?

Jerry

I don't really understand what your asking. To disconnect the battery you just remove the cables...

When installing a battery in an '01, you MUST turn the key to position II before you connect the battery. Failure to do so will detonate your AC control panel. (Ask me how I know...)

This is absolutely not true. The key should be off when you install the battery. Why you blew up the CCM... I dunno.

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I've seen that procedure (position 2 before reconnect) in official Volvo documentation somewhere. Didn't make sense to me either. Seems I'd be much more likely to damage a module from a surge/spike that way. I've never done it that way in my 2003 S80 and never had a problem. You do have to reset the blower knob min and max but that's any time you disconnect the battery regardless of how you reconnect it.

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This is absolutely not true. The key should be off when you install the battery. Why you blew up the CCM... I dunno.

Sorry - you're wrong.

I've seen that procedure (position 2 before reconnect) in official Volvo documentation somewhere. Didn't make sense to me either. Seems I'd be much more likely to damage a module from a surge/spike that way.

In the case of a multi-hundred dollar part, reconnect in position 2 - just to be safe.

I asked the dealer about it when I was getting the part and was told "yeah - there's a TSB out about it and they added it to the manual..."

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Sorry - you're wrong.

I have installed hundreds of batterys in p2 Volvos and have NEVER put the key in POS II. I've also never blown up a CCM. :rolleyes:

Sorry - Your still wrong.

And before you start cheerleading the owners manual, remember, that manual also says to change your oil every 7.5k.

Thanks for playing.

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i am have never used a battery tender or put the key in any position but in my pocket when i have disconnected the battery on my S60 (about a dozen times or so) - and i've never had a single issue - except i set the alarm off several times , hahaha

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Sorry - Your still wrong.

Listen - I'm not going to get into an argument about it... Volvo says to do it this way, I've personally blown up a CCM NOT doing it according to their procedure. Were it my car, I'd DO IT THE WAY THE TECHS SAY TO DO IT.

But hey - you know what's best!

you%20win%20PRIZE.jpg

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Thank you for all who replied. I'm still wondering, but having the key off on reconnect does make sense in a way, but if one thinks in terms of "power surge" to a sensitive electronic, what's the difference of making the connection or turning on the key. Wouldn't the accessories not be able to tell the difference?

In terms of disconnection, waiting for a short term also seems to make sense. Aren't there sub-systems active in electronic activity for a given time once the key is off. Shouldn't we wait until these stabilize?

Then again from an engineering perspective, shouldn't it be robust enough to be able to take a hard reboot? My computer boots up again if there is a power disconnect, just like disconnecting the battery.

Perhaps there is no right or wrong, just good engineering, Ha Ha (I'm an engineer so I'm bias)

Jerry

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as far as the ccm goes. i blew mine while jumping my s60. however after pulling it out and not willing to pay the ridiculous amount for a new one as well as programming i opened it up to take a look.

it turns out the weak point in the system is the auto climate temp sensor located behind the small vent on the right hand side of the ccm. if you overload the circuit it pops the sensor and breaks the ENTIRE circuit board that is the ccm.

i bought a used one for 30 dollars. took the circuit sensor out of the used one, installed it in the old one, and fixed this ever so common problem with p2s at a savings of roughly 700$

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The way I understand it some modules stay on all the time regardless of key position but others go into "sleep mode" after a while with ignition off. Haynes says to wait five minutes before disconnecting battery I think. I usually give it 10 or 15 to be safe. Just seems to me that fumbling around while reconnecting with key in position two might cut power to some module in the middle of a resume/suspend operation, leaving it in an unrecoverable state.

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I got this link from one of my Volvo friends at work. It is an IPD link, and near the bottom of the page is a link to a battery disconnect procedure as well as the logic behind why it's done that way. You will probably have to cut and paste into the command window for your browser. Enjoy!

http://www.ipdusa.com/nl-70-630

Jerry

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