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850 central locking draining battery

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

beigg
Posts: 691
Joined: Sun Sep 22, 2013 9:07 am
Year and Model: 850 97
Location: Est. Mi
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Uruguay
beigg

Re: 850 central locking draining battery

Post by beigg » Fri Aug 26, 2016 3:22 am

BEJinFbk wrote:
beigg wrote:
BEJinFbk wrote: Not so.
There are no sensors that tell this relatively simple
security system if the doors are locked or not.
It just ships out lock and unlock pulses.
I've had my 850 drain the battery dead trying to engage a door lock that was not functioning correctly.
So what was the fix?
Cleaned and lubricated the locking mechanism for the door causing the hang-up.
ugh smh 850 Turbo fridge

Covert
Posts: 103
Joined: Sat Jul 30, 2016 11:25 am
Year and Model: 1997 850
Location: Northampton
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Great Britain
Covert

Re: 850 central locking draining battery

Post by Covert » Fri Aug 26, 2016 3:24 am

well , after much head scratching , we have narrowed it down to the drivers side rear door lock....

when you lock the car it locks the door , but something is not right as its humming , only very faintly i couldn't hear it at all !

so we figure this must be the cause of the drain , as if you don't lock the car its fine you could leave it 2-3 weeks until the battery runs out of juice just enough to start her up.

many thanks for all those people who gave advice and support it is appreciated

beigg
Posts: 691
Joined: Sun Sep 22, 2013 9:07 am
Year and Model: 850 97
Location: Est. Mi
Has thanked: 0
Been thanked: 0
Uruguay
beigg

Re: 850 central locking draining battery

Post by beigg » Fri Aug 26, 2016 6:59 am

Take brake parts cleaner, then wd40, and an old tooth brush to the moving parts that make it secured. Blast it with some compressor air following it all by an application of synthetic silicone grease to those cleaned up parts.
ugh smh 850 Turbo fridge

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