03 trailblazer door lock problems

Can anyone help me, I have a 2003 Chevy trailblazer LS i got a new alarm installed today and everything works great, but i have a problem with my lift gate not locking when using the remote to lock it. I am able to unlock the gate with the remote, but not lock it. I can however lock and unlock using the button on the driver side door. We used bypass DEI-457g to do the door locks, its the same bypass that i had on before with just a normal keyless entry system. I ordered a Bypass # DEI-455g and it's being shipped to me right now. Anyone know if that will solve the problem? Because the DEI-457g is a GM bypass so i figure its a type of universal bypass for GM cars, the DEI-455g is a bypass specifically for a Trailblazer and Envoy. Any help would be greatly appreciated. Thanks in Advance.

Ive heard of that problem with the 457g and the trailblazers. I could be wrong but I dont think that the 455 will solve your problem. I do know that the 1700g will fix your problem and I am sure that there are some other solutions out there. The 1700g just is what I have always used and it works great.

Try using the PGNDLBP by peripheral. I had the same problem and tried everything and this was the only one to work with the first ry and have not had any problems since installed.

That's a known design flaw of the 457G, among several other shortcomings.

The 555G will not only lock the tailgate correctly, but also, the domelight will come on when you unlock.

use an xpresskits xk01 with amdl firmware. will control all locks/ security and will do passlock bypass

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Steve Sverdahl
Swerksound Auto Electric
Red Deer Alberta

Thanks guys i guess i will try the 455g anyways first seeing as how i already ordered it and is on it's way, if that don't work I'll get the DEI-1700g and give that a shot. Thanks again everyone for your help.