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I'm having the same problem. I've tried about 3 different firmware downgrades, none of which are working. This is a pain in the ass. The new ipods are still 6th gen but they have upgraded firmware, which I think is locking out the roll backs. If anyone has had any luck on downgrading the 2.01 firmware, please help us out.

Found out it was the fuse. I didn't realize what a blown fuse would look like until I saw some normal fuses. So I bought some new 3Amp fuses and put one it, and everything worked just fine. Write this up as a stupid newbie mistake lol. Thanks for all the help man.

The wires are securly fastened together. The cap looks like its been crimped and twisted. So it can't be that. I did finally get a voltimeter and tested the yellow BTB200 wire. I took apart the fuse case and before the fuse I got a reading of close to 16V. After the fuse I did not recieve any kind of reading. So thats gotta be the fuse right? I took out the fuse and it doesn't look like its damaged in anyway, but I'm going to go buy a new one just to test it out. The actual little white power connection to the BTB is good as well, all connections are snug.

Yes that is how I have my BTB set up. I've tried moving the cable to the other port but still no connection, so I moved it back. I've also tried resetting the BTB, resetting the AVIC, and also removing my car battery positive end and re attaching. Still doesn't work. Now I'm getting an airbag warning that tells me to take my car to the dealership, lol. Just my luck. Anyways, to rewire the power for the BTB what will I have to do? Will I have to strip the wires, twist them together, and cap them again? Thanks for the help so far

I had the Parking Brake green wire and the BTB200 yellow wire tapped together. The BTB200 still had power from the 12V constant power yellow wire. I had done that because I read if you tap your parking break wire into any wire that has a constant 12V then it always thinks the Parking brake is engaged, thus you can fool around with the nav settings and watch video. However it didn't work so I removed the wire tap. The BTB200 is still capped into the stero power cable. The cap has the car stero yellow wire, avic d3 yellow wire, and BTB yellow wire all together.

Alright so the connections look good. I have the cable going from the BT Out on the BTB200 to the BT In on the Avic D3. There were no broken pins. The fuse on the BTB200 power cable looks fine. I wish they had a damn power indicator on the BTB200, how hard would a little light be? I gotta lean towards it being the power to the BTB200, how can I fix this? Will I have to cut the current power wire and twist it together or something?

I'll go check the pins and make sure no pins were bent or broken off on the IPBUS wire. Also, at one point, I had the parking break wire tapped into the BTB200 power wire. I removed that wire tap before I installed the bypass, do you think that could've broke the cable in some way?

My AVIC D3 was professionally installed in my 07 Scion TC. I did the bypass yestrday and it works fine. However I do not have my Bluetooth options any longer. The connections are correct and were not changed. However when I grounded the bypass wires, I grounded them to the Bluetooth ground (all 3 grounds were wired together), could this be the cause of the BTB failure? I took voltimeter readings on the power connection for the BTB 200 and did not receive any voltage. How can I fix this? Will I have to re-wire the power connection for my BTB? Please include details in what exactly I n