STLBMZ1 SLK, CLK, SL why does the "alarm" or "siren" chirp not work?

Question:

The chirp feature for the SIREN settings does not work, yet the car does have factory alarm.

 

Answer:

The SIREN chirp feature only works on cars with the red "panic" button on the remote. If there is no red round button on the remote that allows manual trigger of the siren, then our module will not be able to control the high-pitch alarm siren. Instead simply use the HORN chirp setting which uses the regular driving horn as a signal output.