2007 TLS. Handsfree link suddenly stopped working, worked one more time, and now is back to being dead. Pressing the HFL button does nothing. Any ideas on how to troubleshoot/debug, before determining that I need to replace it?

 

I wish I knew... I am having the same problem with my 08 TLS... I'm just starting to do some research. If I find anything I will post a link for you.

 

There is no troubleshooting, this is a known issue, if you are having problems you will need to replace it. You can try baking the HFL module, scratch that, dont bother, most everyone who has done it has only got it working again for a couple weeks. Buy it new, you can get it for about $220 shipped from one of the acura websites.