I was having problems with a fairly new Optima battery losing power after my car sat over the weekends. I had the battery and alternator tested which were fine. After doing some more research I found that the Bluetooth Hand Free Link module burns out due to its location in the sunroof control panel which exposes it to heat from the sun. After replacing the module I did not have any more issues with the battery dying over the weekend. It's also a really easy problem to fix on your own because the part comes in a new sunroof panel.

Bought this car new...nearly $40K in 2007. And it EATS batteries. The Goodson Acura has had the vehicle multiple times from virtually the inception of buying it. They claim they can't find anything wrong with it, but yet it eats a battery a year. In between battery replacements, the battery goes dead. Sometimes it will go a month or two between failures, other times it's weekly; even daily. One repair shop has found that the nav system continues to draw power after shutdown. Goodson's solution is to tell us to make sure to lock the car at night...saying that it needs to be "put to sleep" at night!!!! Can you believe that crap!!!!

If this problem were to have been quicker to manifest itself, we would've made them take it back under the lemon law. Don't buy Acura! They do NOT stand behind their product.

My 2007 Acura TL-S has gone through batteries like secret service agents through prostitutes. Acura ignored this problem, but did replace one or two batteries while under warranty. The problem is obviously a large battery drain at night, or even after a couple hours of sitting. I thought I had the problem solved when the Bluetooth module was replaced, but 12 mos later, another battery was dead. Research on the web showed this a common problem on the MDX, and Acura TSB-11-031 was issued to fix it. The problem is a relay which is stuck closed (and therefor is always draining the battery), the AC Compressor clutch relay, which can cause cooling system outgassing (as mine did after running a few minutes while the battery was recharging) or worse. The problem is intermittent, so my shop was not able to find it on two previous occasions. Be sure to get the -A05 relay, and not the -A03 original which caused the problem. It is too bad that so much grief (10-15 times in 8 years coming out to start the car and having it completely dead) is caused by a $20 part and Acura won't do anything about it.