[...] I was going from a CS-2004DC to the DCII model. The upgrade was easy, I didn't change the siren, and I simply removed the pins from my old harness and inserted them into the new one. This saved me rewiring anything but the additional pin for the Horn Honk with siren.
Also this version was the REVB version (REVC only adds HONK with CHIRP which I don't want)...
Over my Series I of the 2004 I gained horn honk, an extra built in relay on the alarm brain, disarm with trunk pop (this was the main reason I upgraded), plus the remotes have an LED flashlight and support for two vehicles.
This is a great alarm for those that don't require remote start or paging included.
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