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This is a discussion on hybrid battery disconnect within the Gen II Prius Care, Maintenance and Troubleshooting forums, part of the Gen II (2004-2009) Toyota Prius Forums category; I read an car magazine which indicated there was an hybrid battery disconnect switch when the car is not being ...


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Old 06-05-2008, 02:40 PM   #1
kaufmja
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Default hybrid battery disconnect

I read an car magazine which indicated there was an hybrid battery disconnect switch when the car is not being driven for several weeks. does any one know were it is?
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Old 06-05-2008, 03:16 PM   #2
Danny Hamilton
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Default Re: hybrid battery disconnect

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Originally Posted by kaufmja View Post
I read an car magazine which indicated there was an hybrid battery disconnect switch when the car is not being driven for several weeks. does any one know were it is?
Yep, it's the circular button on the dash that has "Power" written on it. When the Prius is turned off, it opens relays that disconnect the hybrid battery. When you press the button with your foot on the brake to turn the car back on, the car uses the 12V battery to close the relays and reconnect the hybrid battery to the car.
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Old 06-05-2008, 04:34 PM   #3
Bill Merchant
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Cool Re: hybrid battery disconnect

Hi kaufmja, welcome to PriusChat!
What Danny Hamilton said is correct, but may not address what you heard or were asking about. The 12V battery, which boots the computers and closes the HV Battery relay, is small. Toyota recommends disconnecting it if your Prius is going to sit unused for a few weeks.
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Old 06-05-2008, 05:08 PM   #4
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Default Re: hybrid battery disconnect

Which hybrid? There is no such manually operated switch in a Prius. There is a button (on the dash near the steering column) to toggle the Smart Key System on/off.

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Old 06-05-2008, 05:10 PM   #5
kaufmja
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Default Re: hybrid battery disconnect

thank you for your input
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Old 06-05-2008, 06:03 PM   #6
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Default Re: hybrid battery disconnect

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Originally Posted by kaufmja View Post
I read an car magazine which indicated there was an hybrid battery disconnect switch when the car is not being driven for several weeks. does any one know were it is?
There is an orange traction battery safety interlock switch. It can be seen if you remove the folding hatch floor and the black plastic tray covering the spare tire, and is located on the left side of the traction battery.

This switch is not intended to be used during vehicle storage. Rather it is intended for use when the hybrid system is being serviced. Its purpose is to open the battery circuit so that the battery cables can be touched without causing an electric shock.

As was previously pointed out, the 12V auxiliary battery should be disconnected for long-term storage.
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