Open Hood & Pwr

Stock4Evr · 06-16-2018, 08:51 AM

Does leaving the hood open for a long period of time drain any of the battery? Does the car still go to sleep?

Havocsteve · 06-16-2018, 08:55 AM

With the hood open and the car off, I don't think it has any drain on the battery. Makes no sense to me other then the key being near the car if your working on it.

tock172 · 06-16-2018, 09:19 AM

Unless the car is locked, which the hood needs to be closed to happen, the car is not going to enter its sleep mode. It's going to keep cycling a few systems and other things that would normally be dormant if the car was locked. The trunk, hood and all doors need to be closed for the system to function as intended.

Stock4Evr · 06-16-2018, 09:23 AM

Quote:

Originally Posted by tock172

Unless the car is locked, which the hood needs to be closed to happen, the car is not going to enter its sleep mode. It's going to keep cycling a few systems and other things that would normally be dormant if the car was locked. The trunk, hood and all doors need to be closed for the system to function as intended.

From what you wrote I understand that the system will be drawing small amounts of energy from the battery with the hood open. I connect a trickle charger to the car because there are times I do not dive it for a week or more and then just for short distances.

Stock4Evr · 06-16-2018, 09:24 AM

Quote:

Originally Posted by Havocsteve

With the hood open and the car off, I don't think it has any drain on the battery. Makes no sense to me other then the key being near the car if your working on it.

I would also think that this was the norm. The key is not near the car.

tock172 · 06-16-2018, 02:42 PM

Quote:

Originally Posted by Stock4Evr

I would also think that this was the norm. The key is not near the car.

If you leave a modern BMW parked in a garage unlocked, or with the hood open, it will prematurely drain the battery.

Modern BMWs use a highly sensitive IBS sensor which will prevent the car from going to sleep if the hood is open. Read more at this link: https://www.youcanic.com/guide/bmw-i...ery-sensor-ibs

Quote:

Originally Posted by Stock4Evr

From what you wrote I understand that the system will be drawing small amounts of energy from the battery with the hood open. I connect a trickle charger to the car because there are times I do not dive it for a week or more and then just for short distances.

I do the same, but I have my trickle charger connected to the battery in the trunk. The wire is thin enough that I can completely close the trunk and lock the car while its plugged in and charging.

chris_flies · 06-16-2018, 08:22 PM

I leave the hood open all the time, and can lock the car, and it'll even go to sleep. I can even leave the trunk open and on a charger, and still lock it and it'll go to sleep. Maybe this is a result of not having the alarm system?

Olgeezer1 · 06-17-2018, 08:11 PM

Quote:

Originally Posted by chris_flies

I leave the hood open all the time, and can lock the car, and it'll even go to sleep. I can even leave the trunk open and on a charger, and still lock it and it'll go to sleep. Maybe this is a result of not having the alarm system?

Same thing here. No problem locking the car with the hood open.

gjm120 · 06-17-2018, 09:08 PM

Quote:

Originally Posted by Olgeezer1

Same thing here. No problem locking the car with the hood open.

Same here also. I have the alarm system

blue135 · 06-18-2018, 12:10 PM

Haven't tried locking with hood open, but know alarm goes off if I open hood without unlocking car first. 'course it was then that I learned I had alarm.

06-16-2018, 08:51 AM	#1
Stock4Evr RetNavSpook 67 Rep 398 Posts Drives: 2012 135i - 2016 320i Join Date: Jan 2014 Location: Canyon Lake, Texas iTrader: (0)	Open Hood & Pwr Does leaving the hood open for a long period of time drain any of the battery? Does the car still go to sleep?
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06-16-2018, 08:55 AM	#2
Havocsteve Second Lieutenant 82 Rep 276 Posts Drives: 2011 E82 135i Join Date: Feb 2016 Location: Toronto, Canada iTrader: (0)	With the hood open and the car off, I don't think it has any drain on the battery. Makes no sense to me other then the key being near the car if your working on it.
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06-16-2018, 09:19 AM	#3
tock172 Beachtown Bill Collector 582 Rep 1,062 Posts Drives: 2012 135i Join Date: May 2011 Location: San Diego iTrader: (1) Garage List 2012 BMW 135i [0.00] 1999 Lexus LS400 [0.00] 1985 BMW 325e [0.00]	Unless the car is locked, which the hood needs to be closed to happen, the car is not going to enter its sleep mode. It's going to keep cycling a few systems and other things that would normally be dormant if the car was locked. The trunk, hood and all doors need to be closed for the system to function as intended. __________________ 2012 BMW 135i Space Grey Metallic M-Sport DCT Dinan S2
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06-16-2018, 08:22 PM	#7
chris_flies Sideways and Smiling 3027 Rep 2,860 Posts Drives: In Exuberance Join Date: Mar 2017 Location: Rosamond, CA USA iTrader: (0) Garage List 2012 BMW E91 328i [0.00]	I leave the hood open all the time, and can lock the car, and it'll even go to sleep. I can even leave the trunk open and on a charger, and still lock it and it'll go to sleep. Maybe this is a result of not having the alarm system? __________________ 2012 BMW 328i 6-Speed Wagon \| Deep Sea Blue with Grey Dakota Leather \| Manual Swap, 330i Intake + Tune, 3.15 Helical LSD, Öhlins R&T (SOLD) 2009 BMW 128i 6-Speed Coupé \| Monaco Blue with Black Sensatec \| chris_flies' 128i thread
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06-18-2018, 12:10 PM	#10
blue135 Captain 368 Rep 650 Posts Drives: 2008 135i Convertible Join Date: Aug 2015 Location: Sarasota, FL iTrader: (1)	Haven't tried locking with hood open, but know alarm goes off if I open hood without unlocking car first. 'course it was then that I learned I had alarm.
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