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post #1 of 25 (permalink) Old 07-17-2006, 02:12 PM Thread Starter
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Default Dead Prius Battery and I KNOW WHY!!!

My battery was dead at lunch today. Figured I would let you in on a little bug I may have found in the Prius today.



The 12V battery will die if you follow this sequence of steps.


1.) park with your lights on
2.) open the driver’s side door
3.) power off the car
4.) exit out of the car

Your lights will be on at this point and will stay on. This happened this morning when talking with a friend. I opened up my door and then rolled up my window since we were in a conversation and then powered off my car



If you reverse steps 2 and 3 this will not be a problem.



I guess that’s what I get for bragging about my 53 MPG . I lost that information when the battery died and now I’m averaging 16.1 mpg since I had to sit at Wendy’s with my AC on!

Anyone else ever run into this problem before? My battery died one other time in the past and I'm sure I did the same thing.
-Ryan
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post #2 of 25 (permalink) Old 07-17-2006, 02:30 PM
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I've not had the dead battery, but I've done the same sequence with my old Camry and with this Prius. Fortunately, the parking lot security called to say lights on. sigh.

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post #3 of 25 (permalink) Old 07-17-2006, 04:33 PM
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It's not really a bug. It should have been beeping though before you shut the door since the lights were on, but that could have been masked in your mind since it initally would be beeping because you opened your door with the car still on.
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post #4 of 25 (permalink) Old 07-17-2006, 09:24 PM
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Yup, another way that works to drain it:

1. Start with the car off.
2. Get in the passenger's side.
3. Turn the car on (with the lights on,)
4. Turn the car off
5. Get back out the passenger's side.

Because the car came on and went off with the headlight control in the 'on' position, it turned the lights on, but because the driver's door didn't open after the car was turned off, it didn't turn the lights back off.

(Yes, I know this second way from personal experience.)

Owner of 'Eeyore', a 2004 Prius. Only took 2 days from start of search to delivery.

8 years of ownership, 115,000 miles, about 40 MPG average at present.
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post #5 of 25 (permalink) Old 07-17-2006, 10:05 PM
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Quote:
Originally Posted by ehurtley
(Yes, I know this second way from personal experience.)
:::raising hand:::

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post #6 of 25 (permalink) Old 07-17-2006, 10:06 PM
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That's how I found it too, while using my tire air pump, since it plugs in on the passenger side. I went to the driver's side to see if I did something wrong turning it off, opened the door, saw nothing wrong, closed it, and they went off. It wasn't until later that I realized the significance of which door I'd used.
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post #7 of 25 (permalink) Old 07-18-2006, 01:04 AM
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It seems like a lot of problems could be avoided by just turning off the lights. I have always done that for cars that do not have a specific "auto" feature for the headlights. The Prius does not have such a feature. It just makes an attempt to turn them off for you but it's not the same thing.
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post #8 of 25 (permalink) Old 07-18-2006, 08:15 AM
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Is turning off the lights for you fewer steps than closing the driver's side door is for the rest of us? Easier steps to remember? Not sure I see the advantage of doing it that way -- just seems like the old-fashioned and harder way.
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post #9 of 25 (permalink) Old 07-18-2006, 08:29 AM
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I don't mention the "auto light" feature to my family when they drive my Prius for just the reasons presented. Going out of sequence can drain the battery, so I'd rather have them turn off the lights each time. (I leave them on for my driving). One problem I've had, though, is my husband not closing the trunk hard enough when he helps me with groceries. Fortunately, someone (DanMan?) wrote a while back that the Prius doesn't allow the battery to cut out completely with trunk left open. Correct? It was not tightly latched for nearly 2 days this week.

Don't put off till tomorrow what you can do today.

Evander (immortal guinea pig)
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post #10 of 25 (permalink) Old 07-18-2006, 08:42 AM
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If the hatch is left open, your battery will drain. Many have reported this happening to them. I think the main dome lights will shut off after a time if a door is left open, but I'll have to check on this.

The reason the headlight auto-off acts the way it does is because you may actually want or need light with the car powered off. Also the only way the car can guess the driver is leaving is if he opens his door. If he didn't open his door, he is most likely still inside and still needs the headlight.
You wouldn't want to have to change a tire at night and find that you can't even turn on your taillights with the system off. You might not be seen at the edge of the road and get hit.
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