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Security key fob car no power

Help, Advice, Owners' Discussion and DIY Tutorials on the Volvo S80 model. Sometimes called an "executive car", the S80 was and continues to be Volvo's top-of-the-line passenger car.
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mike64220
Posts: 5
Joined: Sun Apr 15, 2018 7:18 pm
Year and Model: 2008 S80
Location: Tampa, FL
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Security key fob car no power

Post by mike64220 » Sun Jul 08, 2018 11:05 am

Went to start car and no power whatsoever. battery has juice but car will not start and lights will not come on. inserted fob into dashboard and still nothing. Fob stuck in dashboard. Water came in through sunroof drains. Could that have fried something? I've taken battery cables off and touched them together to reset system. Power came in for short time but car still wouldn't start then it shut off again.



SuperHerman
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Re: Security key fob car no power

Post by SuperHerman » Sun Jul 08, 2018 5:13 pm

Your CEM may have taken a bath. That is where I would start looking.



mike64220
Posts: 5
Joined: Sun Apr 15, 2018 7:18 pm
Year and Model: 2008 S80
Location: Tampa, FL
United States of America

Re: Security key fob car no power

Post by mike64220 » Sun Jul 08, 2018 9:55 pm

Ended up being bad battery. Once it was load tested it showed bad but still showing 12.7 volts when not under load.



SuperHerman
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Re: Security key fob car no power

Post by SuperHerman » Sun Jul 08, 2018 10:40 pm

Excellent news. You got lucky. Clean up those sunroof drains and make sure they work correctly. Make sure the drains for the windshield are also clear.

The CEM sits to the left of the steering column nicely tucked away - BUT in the path of typical water intrusion problems.



jimmy57
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Re: Security key fob car no power

Post by jimmy57 » Sun Jul 08, 2018 10:44 pm

on his P3 S80 the CEM is in passenger foot area on firewall.



SuperHerman
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Re: Security key fob car no power

Post by SuperHerman » Sun Jul 08, 2018 10:48 pm

Good catch - I thought he had the earlier P2 model. Regardless - clean the drains.



mike64220
Posts: 5
Joined: Sun Apr 15, 2018 7:18 pm
Year and Model: 2008 S80
Location: Tampa, FL
United States of America

Re: Security key fob car no power

Post by mike64220 » Mon Jul 09, 2018 6:21 am

Thanks guys. Yes I'd clean the sunroof drains a couple months ago but I guess more leaves or something got back in there. No good if brain is on the floor and there's water issues



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