Tapping into OEM horn for alarm

[economatic]

Hey everyone. I have a 2008 Yaris sedan and I'm installing an alarm. The installation is complete minus tapping into the horn. I think I found the right lead(s) but I'd like to hear what others did with theirs. The problem with mine is I did the install right before taking the car into the shop to have the drivers airbag replaced (theives stole it) so the horn wasn't operational.

At any rate, I found this outstanding write up for installing a keyless entry and he tapped into the D3 harness. I found the same D3 harness but there were two other wires--in other words it had black, tan, and pink wires. Anyone else see the additional wires and if so did you tap into them for the horn? FYI, I metered the black one and it showed constant 12 volts. I also read there is a black/light green wire in a 36 pin harness at the fusebox. I think I found it but am less sure about it. That one also showed constant 12 volts.

By the way, I will mention that I had the same 712T keyless entry installed in my car. I chose not to install an alarm as...well...it is only a Yaris and I knew I wouldn't keep anything valuable in the car. Well, in the nicest of nice neighborhoods theives broke a back window, completely ransacked the interior of the car (stole a flashlight? Come on!), and stole the driver's side airbag. My car was the only one that got hit among many expensive cars in the neighborhood. In other words, thieves were looking for cars without alarms. Just something to keep in mind if you're thinking about saving a few bucks by getting a keyless entry vs. an alarm.