Two problems related to horn assembly have been reported for the 2007 Toyota Avalon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Toyota Avalon based on all problems reported for the 2007 Avalon.
Repeatedly this car is doing dangerous, bizarre things, and they're getting worse. There' is apparently a problem with the electrical system: when honking the horn the radio comes blaring on very loud and the ac and blower blast out at full force (startling my daughter); sometimes when braking hard, the radio goes on; often when honking the horn, the ac goes on and the radio goes on; when using turn signals the ac goes on and the heater goes on; when turning on ac the horn honks. This is more than annoying -- it is bordering on causing possible serious distractions and an accident. This is a Toyota problem -- why should I have spend big dollars getting it taken care of. Surely other car owners have reported similar issues???.
Many very annoying and potentially hazardous electrical glitches (but which are very hard to replicate, and new glitches can appear without warning). Some examples: when I honk horn the radio might turn itself on; honk horn while braking and a/c may decide to blast on full force; use right turn signal and radio may turn itself on; doors two times unexpectedly locked when everyone was out of car for a moment (could be dangerous if car is still running or keys or a strapped-into-a-carseat child is left inside!); also, heater will not maintain constant temperature -- far from it, resulting in constantly jiggering the temp up dramatically, then down dramatically to make the temperature reasonably comfortable. All above, except for when car locked everyone out, happened while car was moving, in city and rural driving. Recently these glitches have gotten much more common and I fear more, perhaps more potentially deadly ones, could happen. Car has only 95k miles on it and has been well maintained.