Just removed head unit, keyless entry still works!

The car is a 1996 Acura Integra. I wanted to replace the factory head
unit. I heard somewhere that doing this would kill my keyless entry.
I accepted this fact and went ahead with the head unit removal. At
this moment, the factory head unit is out of the car and the new one
has not yet been installed. The keyless entry still works!

This seems to contradict everything I have read. Does anyone know how
it is still working?

 

The problem was related to 1996 through 1998 Civics. On these cars the
keyless remote receiver (and security system, if so equipped) was
integrated into the head unit. The dome light wire goes through the head
unit as well since it is connected to the security system.

 

So where is the keyless entry receiver in the 96 Integra?

 

I believe its in the driver's door.

 

Honda hides them all over the place. '99 Prelude's is in the left side
panel, about where a rear passenger's left hip would be IF somebody actually
sat there!