XC70: Electrical - Battery replacement/disconnection

monkeh · Jun 15th, 2021, 10:27

I've had to disconnect the battery for an extended period of time— I've had to send off the engine ecu for a remap, is there any special procedures for reconnection? I've experienced issues with my chrysler reconnecting a battery, I hear canbus gets funny when being reconnected.

09 xc70 d5

Clan · Jun 15th, 2021, 10:27

Quote:

Originally Posted by monkeh

I've had to disconnect the battery for an extended period of time— I've had to send off the engine ecu for a remap, is there any special procedures for reconnection? I've experienced issues with my chrysler reconnecting a battery, I hear canbus gets funny when being reconnected.

09 xc70 d5

No problems with volvos .....

monkeh · Jun 15th, 2021, 10:41

Marvelarse!
Glad to see you still about. Don't want it to crap out at the bottom of barrack hill.

Clan · Jun 15th, 2021, 11:57

Quote:

Originally Posted by monkeh

Marvelarse!
Glad to see you still about. Don't want it to crap out at the bottom of barrack hill.

what a hill , you should get up there in top gear

Tannaton · Jun 15th, 2021, 12:44

The general advice is re-connect the battery +ve lead first and then then -ve. The only reason for this is if you catch your spanner on the bodywork whilst tightening the +ve terminal you won't short the battery.

Ian21401 · Jun 16th, 2021, 22:46

General view appears to be to use an OBD2 battery saver plugged into the diagnostic socket and connected to a 12v source to preserve all the car’s settings whilst the main battery is removed. This does seem very sensible as we may soon need to replace the battery on my daughter’s 2011 XC70 and she would be well annoyed if I lost all the settings.
Does anyone have a different opinion?
I’ve also seen a similar idea for cars without an OBD2 socket which plugs into the cigar/12v socket and powered from a 12v source. That would be useful for my 940.

Clan · Jun 17th, 2021, 10:52

Quote:

Originally Posted by Ian21401

General view appears to be to use an OBD2 battery saver plugged into the diagnostic socket and connected to a 12v source to preserve all the car’s settings whilst the main battery is removed. This does seem very sensible as we may soon need to replace the battery on my daughter’s 2011 XC70 and she would be well annoyed if I lost all the settings.
Does anyone have a different opinion?
I’ve also seen a similar idea for cars without an OBD2 socket which plugs into the cigar/12v socket and powered from a 12v source. That would be useful for my 940.

You dont loose any settings ...

Tannaton · Jun 17th, 2021, 12:00

Quote:

Originally Posted by Ian21401

General view appears to be to use an OBD2 battery saver plugged into the diagnostic socket and connected to a 12v source to preserve all the car’s settings whilst the main battery is removed. This does seem very sensible as we may soon need to replace the battery on my daughter’s 2011 XC70 and she would be well annoyed if I lost all the settings.
Does anyone have a different opinion?
I’ve also seen a similar idea for cars without an OBD2 socket which plugs into the cigar/12v socket and powered from a 12v source. That would be useful for my 940.

On that car you might have to reset the electric window auto-close feature, this is clearly documented on the manual. No settings or preferences will be impacted. Things have come on a long way since I used to lose the FM radio presets on my 1989 440.

Ian21401 · Jun 18th, 2021, 09:42

Clan and Tannaton,
Do I understand you correctly that disconnecting the battery will NOT affect any of the car’s computer module”s memories, i.e. ECU, TCM etc. but the settings for window closure MAY be lost. Does that also mean that all other user controlled “car settings”, i.e. the ones that the manual advises how to set up/change, eg: seat position memory settings, mirror fold in settings, light settings, radio settings etc. may be lost and need to be reprogrammed.
If that is the case then I think that a memory saver would be beneficial.

monkeh · Jun 21st, 2021, 10:02

I can confirm, No issues, No settings were interrupted apart from the clock needing resetting on the DIM and the windows needed to learn their auto workings.

If I had done that on the last car I had (300c), I would have needed to have had the door open and driven around the car park in opposite directions, reset the compass AND get the climate control unit controls checked.
Ah volvo, something simple finally!

Jun 15th, 2021, 10:27	#1
monkeh Pain in the backside Last Online: Today 09:40 Join Date: Mar 2007 Location: Newport	Battery replacement/disconnection I've had to disconnect the battery for an extended period of time— I've had to send off the engine ecu for a remap, is there any special procedures for reconnection? I've experienced issues with my chrysler reconnecting a battery, I hear canbus gets funny when being reconnected. 09 xc70 d5 __________________ 'Designed by a computer, built by a robot, and driven by a f***ing nutter' '09 XC70 SE - 2" lift, D5 225bhp, poverty spec.

Jun 15th, 2021, 10:41	#3
monkeh Pain in the backside Last Online: Today 09:40 Join Date: Mar 2007 Location: Newport	Marvelarse! Glad to see you still about. Don't want it to crap out at the bottom of barrack hill. __________________ 'Designed by a computer, built by a robot, and driven by a f***ing nutter' '09 XC70 SE - 2" lift, D5 225bhp, poverty spec.

Jun 15th, 2021, 12:44	#5
Tannaton Bungling Amateur Last Online: Today 00:51 Join Date: Aug 2014 Location: Beverley, East Yorks	The general advice is re-connect the battery +ve lead first and then then -ve. The only reason for this is if you catch your spanner on the bodywork whilst tightening the +ve terminal you won't short the battery. __________________ 2011 XC90 D5 Executive 2003 C70 T5 GT 2012 Ford Ranger XL SC 1977 Triumph Spitfire 1500 1976 Massey Ferguson 135

Jun 16th, 2021, 22:46	#6
Ian21401 Premier Member Last Online: Feb 11th, 2023 20:32 Join Date: May 2010 Location: Blyth, Northumberland	Query re use of a Battery Saver. General view appears to be to use an OBD2 battery saver plugged into the diagnostic socket and connected to a 12v source to preserve all the car’s settings whilst the main battery is removed. This does seem very sensible as we may soon need to replace the battery on my daughter’s 2011 XC70 and she would be well annoyed if I lost all the settings. Does anyone have a different opinion? I’ve also seen a similar idea for cars without an OBD2 socket which plugs into the cigar/12v socket and powered from a 12v source. That would be useful for my 940. __________________ Ian. Since 2005: 1992 Volvo 940 estate 2.0L. Manual. Daily driver and workhorse.

Jun 18th, 2021, 09:42	#9
Ian21401 Premier Member Last Online: Feb 11th, 2023 20:32 Join Date: May 2010 Location: Blyth, Northumberland	Clan and Tannaton, Do I understand you correctly that disconnecting the battery will NOT affect any of the car’s computer module”s memories, i.e. ECU, TCM etc. but the settings for window closure MAY be lost. Does that also mean that all other user controlled “car settings”, i.e. the ones that the manual advises how to set up/change, eg: seat position memory settings, mirror fold in settings, light settings, radio settings etc. may be lost and need to be reprogrammed. If that is the case then I think that a memory saver would be beneficial. __________________ Ian. Since 2005: 1992 Volvo 940 estate 2.0L. Manual. Daily driver and workhorse.

Jun 21st, 2021, 10:02	#10
monkeh Pain in the backside Last Online: Today 09:40 Join Date: Mar 2007 Location: Newport	I can confirm, No issues, No settings were interrupted apart from the clock needing resetting on the DIM and the windows needed to learn their auto workings. If I had done that on the last car I had (300c), I would have needed to have had the door open and driven around the car park in opposite directions, reset the compass AND get the climate control unit controls checked. Ah volvo, something simple finally! __________________ 'Designed by a computer, built by a robot, and driven by a f***ing nutter' '09 XC70 SE - 2" lift, D5 225bhp, poverty spec.

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