2010 Prius w/o JBL

[GreyGhost]

I saw a post concerning an issue with a 2011 Prius that was described exactly like my problem. I installed a Pioneer MVH2400NEX with the Maestro RR. The problem is this: When the car is shut off, the radio stays on and the car beeps upon exiting, as if you left the keys in the ignition. My fix was to disconnect the red 12V ACC wire on the harness that connects to the Pioneer. It worked and the radio has all normal functions. But, I am not comfortable with this "bandaid" fix. In the post I saw the person was using a Kenwood with the Mestro RR. Same fix?

[JustinFerroni]

on your TO1 harness you are going to need to remove the step up resistor that jumps across the 12v ACC wire and the K-Line wire. It is located under the white QC sticker under the tape. Cut all the tape and you will see where the two wires are joined together. simply remove the resistor and tape everything up

[jbutner]

I have removed the resistor and taped up the wires and I still have the same problem as described above. Help needed.

[Dara DeGrand]

On your t-harness, there is a white 12-pin connector, and there is a red wire from that connector that is feeding into the car. I have seen this once before, also in a Prius; Cut that red wire and insulate it, and that should take care of it.

[mrflinstone45]

I have a 2011 Prius W/O JBL, and I am experiencing this same issue.

1. Radio will not Turn off when car is turned off.
2. Car makes a beeping sound when you open the door.
3. You are unable to lock the doors using your fob.

I saw on another thread that if you disconnect the OBD2 wire and this fixes your issue, you will want to follow up the Gray w/Red Stripe wire up under the felt tape until you see the heat shrink. At the heat shrink, you will see the Gray w/Red strip wire go into one side and out the other. They say to cut the wire at both the entrance and exit of the head shrink and then connect the cut ends of the Gray w/ Red stripe wire together. Reconnect the OBD2 connector to under the dash and test to see if the radio operates correctly.

I haven't had a chance to test the Gray w Red Stripe wires, cutting the red ACC wire from the 12 pin connector, or removing the "resistor." What I have done though is disconnected the Green "F" connector from the Maestro RR and it has seemed to solve the bigger issue for now. However, this breaks some other pieces that I will want to retain.

Anyone know of the "correct" solution for this?

[Dara DeGrand]

It's a 50/50 shot. The one thing you mentioned above is a likely solution. Otherwise, in the TO1, there is a 12-pin radio harness plug with a red wire in it. Cut that wire. Sometimes, in the prius, it backfeeds and keeps the radio on. I'm willing to bet that's actually your issue.

[mrflinstone45]

As Dara explained, cutting the red wire and isolating it on the 12 pin connector solved the issues that I was having. I was able to reconnect the green connector to the box and everything appears to be functioning as expected. I didn't have to do anything to the OBD2 connector.