Motion Sensor Question (Red clip doing its job?)

[cnk]

I have a 2002 Boxster S. I bought the famous "red clip" so that the motion sensors would be activated even when my top is down. I thought I'd test it out to make sure it works.

I lowered the top and put on the red clip. Closed the doors and locked the car with the remote. I reached my arm into the car and waved it around. Nothing happened. I reached in and tried to open the door via the inside door handle and the alarm went off.

Does this mean that my motion sensor doesn't work? Or do I need to do something else in order for it to be activated with the top down (and red clip on)? Seems like as it is, the red clip isn't really very useful.

Anyone able to shed some light on this?

Thanks,

cnk