My 05 TL HFL was locked and I forgot the passcode. I have searched many ways to unlock the system but no one worked. Here is some experience I can share with acuraziners. Pulling fuse 6 (some posts suggested) will turn off interior light, key remote and the HFL, but when I put it back the HFl is still locked. Pulling fuse 7 (some posts suggested) makes the AC fan runs like crazy and the climate control is out of control while HFL is still on and locked. Disconnecting battery didn't work for me. I even left the car battery disconnected for about 24 hrs, and the HFL is still locked. Finally, I took the car to the local dealer. They unlocked the system and only charged for $32 which is less than I expected. Now HFL works very well.

 

Thanks for sharing. I hope you stored your password in a secure place.