rest heat not working...bad battery??

XS222 · 11-21-2010, 07:01 PM

i've done my fair share of searching about dead batteries and changing out dead batteries, but nothing really related the rest heat not working and a battery going bad....

my car went 3 days without being driven/started, and when i finally got to drive it, it started and drove with no problems - i turned the car off, and the rest heat wouldn't turn on. i thought maybe the car wasn't up to temp, that wasn't the case since i drove the car all the way up to temp (230 oil temp).

i read through the manual and saw one of the conditions for the rest heat was "battery has sufficient voltage", and right as im reading that, the "battery low charge level" light came on. so i took the car out for an extended highway drive (over 50 miles) and when i stopped the car, the rest heat worked.

i figured great its all better now, but the next day the same thing happened - no rest heat.

is my battery on its last leg??

EDIT a new update - i drove home on the highway tonight, got home, turned the car off and hit the rest heat...it turned on for about 2 seconds and turned it off right away. i think my battery is bad.

wuchao1 · 11-21-2010, 11:22 PM

It might be that you having some bad cells in your battery..So that your battery will charge and will working fine.. but it wont hold up charge long and thats why after one night its low again..

wrickem · 11-22-2010, 07:08 AM

Also, what was the outside temperature? It won't work when it's above a certain temperature outside.

I am going to miss that REST feature more than anything this year. Curse you "ALL" button!

XS222 · 11-22-2010, 01:00 PM

Quote:

Originally Posted by wrickem

Also, what was the outside temperature? It won't work when it's above a certain temperature outside.

I am going to miss that REST feature more than anything this year. Curse you "ALL" button!

Outside temp is at or around 45 degrees...I thought this might be the case, but in the searching I've done and in the manual, it says it will work anywhere below 77*F

Richurd · 11-22-2010, 01:43 PM

Are you trying to use rest while your car is on? From what you stated, seems like you're trying to drive with it on.

XS222 · 11-22-2010, 04:58 PM

Quote:

Originally Posted by Richurd

Are you trying to use rest while your car is on? From what you stated, seems like you're trying to drive with it on.

you're absolutely right, it DOES sound like i'm trying to drive with the rest heat on.

my bad! car is definitely OFF when i try to turn the rest heat on.

and a new update - i drove home on the highway tonight, got home, TURNED THE CAR OFF (

) and hit the rest heat...it turned on for about 2 seconds and turned it off right away. i think my battery is bad.

XS222 · 11-23-2010, 04:22 AM

ChasVS · 11-23-2010, 08:12 AM

Classic bad cell battery symptom. You can get the battery tested at most auto supply shops for free.

11-21-2010, 07:01 PM	#1
XS222 Me 12 Rep 246 Posts Drives: Montego Blue 335i Join Date: Sep 2009 Location: CT iTrader: (0)	rest heat not working...bad battery?? i've done my fair share of searching about dead batteries and changing out dead batteries, but nothing really related the rest heat not working and a battery going bad.... my car went 3 days without being driven/started, and when i finally got to drive it, it started and drove with no problems - i turned the car off, and the rest heat wouldn't turn on. i thought maybe the car wasn't up to temp, that wasn't the case since i drove the car all the way up to temp (230 oil temp). i read through the manual and saw one of the conditions for the rest heat was "battery has sufficient voltage", and right as im reading that, the "battery low charge level" light came on. so i took the car out for an extended highway drive (over 50 miles) and when i stopped the car, the rest heat worked. i figured great its all better now, but the next day the same thing happened - no rest heat. is my battery on its last leg?? EDIT a new update - i drove home on the highway tonight, got home, turned the car off and hit the rest heat...it turned on for about 2 seconds and turned it off right away. i think my battery is bad. __________________ Dan Scuderia Ferrari Marlboro Last edited by XS222; 11-22-2010 at 04:59 PM..
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11-21-2010, 11:22 PM	#2
wuchao1 台北台灣 43 Rep 619 Posts Drives: 2004 MazdaSpeed Miata Join Date: Apr 2009 Location: Michigan State Spartans / Taipei iTrader: (5)	It might be that you having some bad cells in your battery..So that your battery will charge and will working fine.. but it wont hold up charge long and thats why after one night its low again.. __________________ 2006 E90 325i AT TiAG...Sold! 2000 E39 M5 "The Beast"...Sold! 2004 Mazda Speed Miata... Bone Stock... 2000 Ford Explorer... Beater all the way
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11-22-2010, 07:08 AM	#3
wrickem Big Beaver Smile 2101 Rep 3,791 Posts Drives: What he wants to Join Date: Mar 2006 Location: lambertville nj iTrader: (0)	Also, what was the outside temperature? It won't work when it's above a certain temperature outside. I am going to miss that REST feature more than anything this year. Curse you "ALL" button! __________________ ______________________________________________ Current- '21 430 , '19 911, 07 M6 ,'17 Jeep Wrangler, "23 Bronco OBXluxsquatch
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11-22-2010, 01:43 PM	#5
Richurd Captain 16 Rep 639 Posts Drives: Too slow. Join Date: Jul 2009 Location: nyc iTrader: (6)	Are you trying to use rest while your car is on? From what you stated, seems like you're trying to drive with it on. __________________ 07 e92 335i \| BSM \| SB \| Gray Poplar Wood Trim \| 6MT \| Premium \| Sport \| Cold Weather \| iDrive \| Logic7 \| Comfort Access \|
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11-23-2010, 04:22 AM	#7
XS222 Me 12 Rep 246 Posts Drives: Montego Blue 335i Join Date: Sep 2009 Location: CT iTrader: (0)	__________________ Dan Scuderia Ferrari Marlboro
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11-23-2010, 08:12 AM	#8
ChasVS Colonel 40 Rep 2,431 Posts Drives: 2012 MB ML350 Bluetec Join Date: Aug 2009 Location: Central FL iTrader: (10)	Classic bad cell battery symptom. You can get the battery tested at most auto supply shops for free.
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