multi dl on trailblazer

I have done 25 to 30 of these with no problems. Now I have one that the locks quit working. The triggers are getting to the multi but they don't l or ul the doors. I switched the module and next day same thing, inop locks. Called tech support and said the flip flop locks were locking the module. So I used relays to make sure it only received negative triggers. Two days later the smae problem. Help help I have fallen and can't get up. I am lost on where to go from here. I would hate to hard wire the car if I do not have to. Thanks guys

Yeah, I thought it was a bad ground as well. I had ground from starter alarm and multi dl tied together so I ran a seperate ground for each. For the relay are you saying use the ground when running to trigger relay so that it send ground to the ground wire on the multi dl? I will give it a shot. Anyone have any other ideas? Like I said I have done 25 to 30 of these with same alarm and multi dl and never had this problem before.

i tried the relay as i stated in previous post, let it sit for 6 hours and customer has same problem. i am so confused. confucious say: burn car and problem melt away?