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Toyota Prius Electrical and Lighting Questions

83 messages,  Last post on Nov 05, 2009 at 5:03 AM

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What is this discussion about? Toyota Prius, Electrical


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#3 of 83
Re: 12v battery always dead after 2 weeks of vacation [pathstar1] by borabora
Jul 29, 2007 (6:35 pm)
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Replying to: pathstar1 (Jul 29, 2007 9:43 am)

thanks Pathstar1,
 
no, i checked every light before i left, and i turned of the SKS, too.
 
beside battery tender, what can i do then? changing a battery?
#4 of 83
Re: 12v battery always dead after 2 weeks of vacation [borabora] by pathstar1
Jul 30, 2007 (6:01 am)
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Replying to: borabora (Jul 29, 2007 6:35 pm)

The battery may have been damaged before the car was sold. That is, discharged and left that way for a few weeks. A good test is to disconnect the battery and leave it for a few weeks to see if it still discharges. Hard to do, as you want to drive the car.
 
Check the battery connections. Make sure they are tight and clean. If they aren't it will never be completely charged. The 12V battery is in the right corner of the hatch area. Remove hatch floor, remove storage bin. Fold black plastic flap forward (away from hatch wall) and lift cover out. You will see the battery.
 
Because it's such a small battery, load testers don't work very well. They are designed for larger capacity batteries.
#5 of 83
Re: 12v battery always dead after 2 weeks of vacation [pathstar1] by jaxs1
Aug 05, 2007 (10:34 am)
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Replying to: pathstar1 (Jul 29, 2007 9:43 am)

I read elsewhere that it is normal because of the battery's very small size and capacity and the solution is to have someone drive the car at least once a week, disconnect the battery, get a battery minder or simply be prepared to recharge the battery when you return from vacation.
#6 of 83
Battery on vacation by suirp
Oct 14, 2007 (12:03 pm)
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I disconnect the battery terminal under the hood when I leave my Prius garaged for up to 10 weeks each summer. Reconnect on return and it starts right up.
#7 of 83
Aftermarket navigation system installation by hoeful
Nov 14, 2007 (10:08 pm)
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I made a mistake in thinking I could have my old Alpine navigation system installed on my new 2007 Prius. That system worked fine on three previous cars where there was plenty of room for it. But on the new Prius, it seems a gamble whether there is any room at all for the installation. People at the dealer's said there is too much wire and components in the dashboard area. Is it possible to get a look-see at that area without too much trouble?
#8 of 83
Utility Battery Drained/Jump Starting by vcgeno
Jan 01, 2008 (1:35 pm)
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I have had my Prius for about 7 months without a problem. A few days ago after parking it 50 degree weather the utility battery died. No doors were open, no lights were on, and I can't figure out what happened. I had it checked out at the dealer and they said there was no problem with the battery or the charging system. It seems to be working OK now. Anyone else have this problem or know what might have gone wrong?
 
I also found jump starting the Prius quite an adventure. Standard sized jumper cables are to big for the battery terminal. I had to find someone with a cheap set of cables in order to jump start the car. The slot where the positive terminal is is much too narrow. Anyone have any suggestions for me?
 
That said I love the car.
#9 of 83
Re: Utility Battery Drained/Jump Starting [vcgeno] by stevegold
Jan 01, 2008 (2:43 pm)
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Replying to: vcgeno (Jan 01, 2008 1:35 pm)

I have a 2004 Prius. The same thing happened to me twice, the first time after a month or two and the second time three years later. I probably left something on as those are pretty infrequent intervals. You do NOT have to get to the small battery to jump it. There are special terminals under the hood that make it real easy. Look in the book.
#10 of 83
Re: Utility Battery Drained/Jump Starting [stevegold] by vcgeno
Jan 01, 2008 (5:35 pm)
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Replying to: stevegold (Jan 01, 2008 2:43 pm)

It was not the other persons battery it was that the positve connection on the Prius is too small for the clamps on standard sized jumber cables.
#11 of 83
Re: Utility Battery Drained/Jump Starting [vcgeno] by pathstar1
Jan 02, 2008 (12:44 pm)
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Replying to: vcgeno (Jan 01, 2008 5:35 pm)

I made my own jumper cables using #25 Mueller solid copper clips on the Prius end and larger ones on the "doner car" end with #10 finely stranded wire (trolling motor cable). The Prius only draws a 1/2 sec. 40 amp pulse when you press on the brake, and another when you press "Start". This cable is heavy enough for that. I keep it in the "secret storage bin" in the front of the console (because you can't open the hatch with a dead 12V battery).
 
When you turn off the car, if you sit inside, the headlamps stay on. This can kill the battery. If you turn the car on and off from the passenger side you will not open the drivers door, and again, the headlamps will stay on, draining the battery. This is how most people kill the battery. So always be sure to open and close the drivers door when you shut off the car.
 
I haven't needed the cable, and probably never will. But I have it ready, just in case.
#12 of 83
Re: Utility Battery Drained/Jump Starting [pathstar1] by talagery
Jan 23, 2008 (11:18 am)
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Replying to: pathstar1 (Jan 02, 2008 12:44 pm)

Thanks for that info..
This is exactly what happened to my brand new 2008 Prius with 1200 miles on it. I realise now that I must have left the headlight on as I powered off from the passenger side. After sometime, I was told that my alarm is going off (which is supposed to happen if the 12V battery is totally discharged (sounds counterintuitive to me !). My dealer Pat Lobb Toyota of McKinney was nice enough to replace my battery free of charge although the 'dead' battery was perfectly fine.
 
Interesting side note: Realised that the 12V has to be active for switching the car to Neutral..

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