Prius (2010-12) :: Key Not Detected Signals - Loose Connection To Battery?


Nov 13, 2012

I changed the battery in my key fob recently. Since then the car has randomly given me "key not detected" signals. At these times, the door lock/unlock buttons don't work either.

When it does, I open it and push the battery around, trying to make it connect, close the fob back up, and it works for some apparently random amount of time. So my best guess it that there's a loose connection to the battery.

If so, have you found a cure, such as the right place to wedge in something small to make the connection secure? Anything else?

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I have a 2005 Prius Gen II with 114,000 miles on it. I was driving last week when it suddenly displayed a Christmas tree of lights that included VSC and the triangle of death....and of course the battery fan kicked into high gear.

Hooked it into a OBD II scanner:
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I went ahead and cleared the codes. The angry lights went away but came back within minutes of driving. The car went into limp mode but I was able to make it home.

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1) What are the correct wires to t-tap for the passenger side?
2) Did I damage anything if I t-tap'ed the wrong cable and I then remove the t-tap?

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