I tested my alarm a few weeks ago. I had the windows open and I put my hand in the car and it went off.

It hasn't worked since. When I press the button on the key chain twice, I hear the horn, but the motion sensors don't work anymore.

Is there a way to reset it?

 

The factory alarm doesnt have any motion sensors that i know of. Shock sensors yes, but no motion sensors.

 

I'm thinking that if you waited at least 1 minute after setting the alarm (assuming nothing was moving about that might have interfered with the alarm setting), you likely have two options:

First you could try resetting the system by disconnecting the negative terminal of the battery and leaving it disconnected for a few minutes before reconnecting it. Set the alarm, wait at least a mniute or two and then re-test.

Second will likely be taking the car to the dealer to have them re-program the system as something may have gotten fouled up relative to the alarm system.

 

Actually there are two sensors next to the dome lights that are part of Active Alarm.