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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

Covert
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Year and Model: 1997 850
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Re: 850 central locking draining battery

Post by Covert » Wed Aug 24, 2016 10:53 pm

I don't know matey I'll check for you

beigg
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Re: 850 central locking draining battery

Post by beigg » Thu Aug 25, 2016 1:10 am

ok. keep us posted!
ugh smh 850 Turbo fridge

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misha
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Re: 850 central locking draining battery

Post by misha » Thu Aug 25, 2016 2:09 am

Check for parasitic drain with digital multimeter.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

Covert
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Re: 850 central locking draining battery

Post by Covert » Thu Aug 25, 2016 4:30 am

Right when you take the key out it cuts the radio off and you can't turn it back on without putting the key back in

beigg
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Re: 850 central locking draining battery

Post by beigg » Thu Aug 25, 2016 10:43 am

If for any reason a door switch or hatch switch is binding and does not complete the commanded lock or unlock state, the central locking system will keep trying to operate that binding mechanism.
ugh smh 850 Turbo fridge

scot850
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Re: 850 central locking draining battery

Post by scot850 » Thu Aug 25, 2016 1:48 pm

misha has re-stated what I suggested earlier. I am like you and not the greatest on the electrical/electronic side but can get by with some guidance. So my next question is how do you know the alarm system is at fault? I may have read you said you left the car un-locked and it didn't drain the battery. Did you check the battery after a day with the car un-locked to see if the battery is draining or not, but by maybe not as much? The reason I ask is that there are a few point on these cars that can also drain the battery that are no the central locking.

So may I suggest you do the parasitic current draw test to ensure which circuit is draining the battery for sure. I thought it was the alarm system on one of my older Volvos to find it was the garage door opener that was constantly on. in a sedan the trunk light staying on when close is another as ids the glove box light staying on when closed.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

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BEJinFbk
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Re: 850 central locking draining battery

Post by BEJinFbk » Thu Aug 25, 2016 2:06 pm

beigg wrote:If for any reason a door switch or hatch switch is binding and does not complete the commanded lock or unlock state, the central locking system will keep trying to operate that binding mechanism.
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.
'98 V70 R - Well Equipped for Life Up North... ;)

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BEJinFbk
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Re: 850 central locking draining battery

Post by BEJinFbk » Thu Aug 25, 2016 2:13 pm

misha wrote:Check for parasitic drain with digital multimeter.
THIS!
After making sure that you've got the radio unlock code handy,
pull the negative battery cable and connect your ammeter in series.

Meter the current draw when the alarm is disarmed, then see what
it is when you arm the system. If it exceeds 35-50 milliamps, start
pulling fuses and see where the excess current is being consumed.

Any chance this car has the optional deadbolt locking system?
'98 V70 R - Well Equipped for Life Up North... ;)

beigg
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Re: 850 central locking draining battery

Post by beigg » Thu Aug 25, 2016 6:05 pm

BEJinFbk wrote:
beigg wrote:If for any reason a door switch or hatch switch is binding and does not complete the commanded lock or unlock state, the central locking system will keep trying to operate that binding mechanism.
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.
ugh smh 850 Turbo fridge

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BEJinFbk
Posts: 3741
Joined: Sat Jan 05, 2008 10:32 pm
Year and Model: '98 V70 R
Location: Fairbanks, Alaska
Has thanked: 24 times
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United States of America
BEJinFbk

Re: 850 central locking draining battery

Post by BEJinFbk » Thu Aug 25, 2016 7:27 pm

beigg wrote:
BEJinFbk wrote:
beigg wrote:If for any reason a door switch or hatch switch is binding and does not complete the commanded lock or unlock state, the central locking system will keep trying to operate that binding mechanism.
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?
'98 V70 R - Well Equipped for Life Up North... ;)

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