Car Alarms: car alarm, car horn, honking

Question
All of a sudden my 2009 camry horn beeps when I lock the doors with my keyless entry. Up to this point it had always just churped twice.  How can I stop the horn from honking when I lock the car.

Answer
The after market system is sending a pulse to the factory
horn as well. Take it to the dealer you got it from so they
can put in a diode to isolate the 2 horns. It's getting
feed back on your car horn now and needs to be backed
off some.

Tell them please diode isolate the 2 horns so this does
not happen.

Luck with it.

ALARMTEK