2004 tahoe RS ultr TL1270

I had an ultra start tl 1270 wDEI 457gm installed in my Tahoe. When I got it home the horn beeped everytime the remote performed some type of function. I was told this was optional (was never asked) and could be programmed out. brought it back had it done. 2 days later the horn beeps twice on remote start when the lights are flashing to signfy start. between the 3rd & 4th flash.brought it back, had it reprogrammed. several days later it does again. few days go by, it stops, sometimes the horn beeps other times it doesn't. also noticed that drivers door ajar sometimes dings when door is obviously closed, have to open and close door to reset. also problem with safety chimes not working.and irratic interior lights. shop changed out interface with a differnt one (gmdp?) same problem horn always beeps between 3&4 flash on startup. shop gave up removed starter and interface, said it ws my 2004 tahoe. Horn a problem becasue wife leaves for work early am quite neighbhood any ideas?

does your horn honk with lock or unlock with fact. remote?

I have an ultrastart 4260 2 way remotestarter that I installed on my 2003 suburban. I used the gmdlbp, and I have had absolutely no problem with it. it beeps once for start, and twice to unlock doors, but the horn honk is bypassed.maybe step up on the remote starter unit to at least a 2260. the 1200 series are entry level barebones. also make sure to use the gmdlbp.hope this helpsjmacf14

shop switched dei 457 fo gmdlbp and horn still honked. only on remote start between 3&4 acknowledge flash of headlights. they also said they diconnected output lead from interface and horn still honked. How I don't know.

I've installed well over a hundred of the 1270tl's and never had this problem a lot them were in conjunction with the 457gw...

yeah soooo????

I've contacted the largest chevrolet dealer in my state. He gave me the number of the shop that does all of their installs (although they don't officially recommend it even though gm now sells it themselves) and have an appointment tomorrow to have a new rs installed. He says there won't be any problems.

I don't  know why they didn't just disconnect the horn trigger wire. the only time the truck should chirp from the remote start feature is through the WHITE/ blue horn trigger off the 1270. The interface sometimes triggers horn honk thru data, but those are factory settings that can be changed through the personalization settings in the cluster from the button on the steering wheel. Bummer really, because I know those units work well with those trucks for as complex as they are.My rifle is my friend...