Join Date: Nov 2009
Vehicle: 2001 Silver SLK230
Other Toys: 1991 Toyota 4Runner
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Sorry for the delay mate, but I had a very busy week and didn't have the time to look for the info.
I have looked through schematics and info and found no indication of presence of motion sensors linked to the Anti-Theft Alarm. As for the Remote control locking, on the R170, it is only an RF and not infrared, and the electronics are not located in the overhead dome light, that's why yours is still working after changing the dome lamp. I'm not sure what that circuitry we see in your pic is for and what those black LEDs are for. (They are LEDs, correct?)
I'm sorry I couldn't be of more help, maybe someone else on the forum could provide more info.