Hi guys, I'm new here. I have a '02 ES300 that I purchased about a month ago. Less than a week ago the single beep sound associated with the car being locked and armed stopped. The car still locks when I press the keyless entry button, and even stranger, the car makes the double beep disarm sound when unlocking, so I know its not an issue with the volume ****.

I did take a quick look around the forums but I didn't find much useful information so any help would be much appreciated.

 

What are you using as a basis for stating that the factory alarm is not arming?

 

if its oem check the door,hood an trunk pins.. it wont (fully arm) if it thinks 1of them is open or grounded out..

 

Thank you Shibumi1, you nailed it on the head! This morning I rolled down the windows, then got out of the car and pressed the keyless entry arm button. I reached through the window and opened the door, and the alarm didn't sound. But as you said, if it thinks 1 of them is open it won't fully arm. I just checked all four doors and found that the back right automatic door lock isn't functioning. It turns out that I've been driving around for a week with my door unlocked. I locked it manually and now the alarm armed just fine. Now I just have to fix the door lock. Problem solved, new one encountered.

 

Nice troubleshooting!!!!!!

Was going to suggest it but you beat me to it!