Integrating horn into aftermarket keyless entry system

Sorry if I am in the wrong section, figured it would be under modified since it's not really OEM... I searched threads to no avail on my question. I have a 99 Jeep Cherokee. Instead of paying $20 for a factory key fob and $70 to have it programmed I just bought an aftermarket keyless entry system with 2 remotes for $25.

http://www.amazon.com/Proline-REC43T-Basic-Keyless-System/dp/B00C92O5KS

Most people simpy take out the original rke module located in the overhead lamp and wire in the new one. It is 4 wires to tie in to the factory harness for basic lock / unlock with the remotes.

I want to take it a step further and make it honk (like the factory) whenever I lock it with the fob. Taking a look at the wiring diagram:

http://www.the12volt.com/installbay/alarmdetail/1212.html

Door lock is Orange/Purple (-) and the horn is Black/Red (-). Couldn't I just combine those two wires together since they are both negative? Correct me if i'm wrong. Of course I wouldn't be able to test this out until Monday, however I just want to be sure there's a chance that it could work out.

Tap into the door lock actuator circuit to trigger a relay that toots the horn.

There may also be a seperate output on the main module that you can use to trigger a relay.

I received my package today, $25 and four wire splices later and I have a working keyless entry system! I tapped into the horn wire that was in the original RKE harness and while it works, when I tap the lock button on the receiver, it sounds the horn for a little too long, around two seconds. For now I unhooked the horn wire until tomorrow when I can mess with it a little more... It is 11 at night and I don't think my neighbors would like my horn going off in the middle of the night:roll:

I installed the same keyless system you did. Very interested if you figure out the horn. I'd even take a running light flash.

Tempted to buy this now just to see if I can make the trunk pop button start it from afar.

I would recommend it. Took me ten minutes to wire it up. I just have to take my door panels off now and lube up all of the lock mechanisms and what not. Passenger always work, drivers is intermittent and rear I have to manually lock. All actuators are good though, however.

I am going to ditch the horn idea and look into wiring up a relay to flash the parking lights as suggested above. Thanks for all the feedback guys!

unless you want the parking lights or horn to go off everytime you lock or unlock the doors from inside the vehicle, you'll need to use a second set of relays.

I think.