Dreadbean

It is NOT a problem that is just the way the system is.

So there is no way of changing the system to beep or churp besides installing an aftermarket horn? I find that strange. The owner manual says that the feature of an audible alarm can be turned on/off and to contact the dealer. I guess my question is, how to turn it on without having to go to the dealer?

Thats correct you can not change the system to make a beep or horn - unless u do it yourself.

double check if you can REALLY turn a beep on or off because if you can do it then i would be surprised because nobody has had it done on hereand there are enough members

You are correct. I spoke to a lexus service manager and he said the audible alarm and features cannot be modified by myself. However they have a scan tool they can plug into the car to modify the body electronics settings which include the alarm features.

I fine that sucks. But if thats what you have to do... then so be it.

It is NOT a problem that is just the way the system is.

So there is no way of changing the system to beep or churp besides installing an aftermarket horn? I find that strange. The owner manual says that the feature of an audible alarm can be turned on/off and to contact the dealer. I guess my question is, how to turn it on without having to go to the dealer?

Did you ever solve the problem with the silent alarm. I have an IS 200 with the same problem. Please help.