I bought a 2007 Highlander Limited (w/JBL sound system) a few months ago. Right away, I noticed that the bass would intermittently cut out (radio, CD, tape, everything). It'll cut out for a few seconds, come back in, cut out again, come back. I would say during a 20 minute drive, it usually happens 1-2 times (so you could drive around for 10 minutes and it might not happen at all). It doesn't seem to be related to battery drain (doesn't happen more when wipers are on or windows are rolled down, doesn't happen more when idling vs. driving).
I have an extended dealer warranty and brought it in to the dealership this past weekend, but they claimed after testing for 2 hours they couldn't reproduce the problem or find anything wrong with the stereo at all. Resigned to give up, I decided to live with it... until this morning, when I decided to see if the bass issue was limited to any one speaker. I decided to replicate the testing the dealership said they would do (testing each speaker zone individually by modifying the balance and fader).
Lo and behold, when faded all the way to the rear, the system produced NO BASS AT ALL. Like absolutely zero. (FYI - Both front speakers have the bass cutting in and out problem, neither one more than the other).
Any clues what the deal is here? This can't be normal, right? I'm definitely not a car audio expert, but the rear speakers are the ones that are SUPPOSED to be producing bass, right? I don't really care if the problems are related, but if replacing the amp will fix both problems, that would be great. It should all be covered by teh warranty. In any case, I want to call the dealer and yell at them for being idiots and not doing any testing, so I'd love to hear people's thoughts (to help give me some ammo).
Any help is appreciated. Thanks!