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XC70 siren back-up batteryViews : 552 Replies : 6Users Viewing This Thread : |
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Jul 13th, 2020, 12:23 | #1 |
Junior Member
Last Online: Jul 14th, 2020 23:58
Join Date: Oct 2017
Location: Yeovil
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XC70 siren back-up battery
Hi everyone,
Getting message saying ‘ alarm system malfunction service required’ I believe this is a common problem and is caused by failure of the rechargeable back-up batteries in the siren. Main dealer said the rechargeable batteries are not replaceable and a new unit is required at around £120 plus labour!!! This seems crazy to me and what an awful design. Searching on-line/YouTube shows people changing the battery pack but it’s difficult to get to. Dealer also said back-up battery is charged from a feed from the main battery not the alternator. Anyone have any views, ideas, experience of this issue? New battery just fitted by the way. |
Jul 14th, 2020, 16:24 | #2 |
Premier Member
Last Online: Today 08:25
Join Date: Feb 2012
Location: Preston
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What age car?
On the P2, the alarm can be accessed from under the OSF wheel arch, there's a security screw to deal with then it just unplugs and it's out. To access the battery you need to cut the unit open as it's sealed, then it's a simplish case of taking the old battery out and soldering a new one in. Then reseal the alarm unit and refit. |
Jul 14th, 2020, 17:29 | #3 | |
Premier Member
Last Online: Today 22:02
Join Date: Oct 2014
Location: Near Bicester, Oxon
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Quote:
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Jul 14th, 2020, 23:57 | #4 |
Junior Member
Last Online: Jul 14th, 2020 23:58
Join Date: Oct 2017
Location: Yeovil
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XC70 2014
There’s some stuff on YouTube about accessing via the wheel arch which involves drilling out loads of rivets. Don’t fancy that. |
Jul 15th, 2020, 00:16 | #5 |
Premier Member
Last Online: Dec 26th, 2021 13:42
Join Date: Dec 2013
Location: Crewe
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Why? Drilling out rivets and popping new ones in is easy.
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2002 S60 SE D5 Manual 209000 miles |
Jul 15th, 2020, 12:49 | #6 |
xc90, volvo number five
Last Online: Yesterday 20:30
Join Date: Dec 2005
Location: Grappenhall
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I refitted the wheel arch with push in plastic trim rivets, easy
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