Help with DEI 455T and 97 Grand Cherokee

I am installing a Crimestopper 900V remote starter into a 97 Jeep Grand Cherokee, and have everything working fine except the door locks.

After working on it for several hours, I came here and found out that door locks aren't that simple on these Cherokees, so I punted and got a DEI 455T to interface to the interface bus.

My problem now is that the doors lock fine, but unlocking doesn't work at all.

I hooked it up as follows:

(-) Trunk Unlock (0.75 sec pulse) from the remote start to the (-) Unlock all (Blue) on the 455T.

(-) Door Unlock (0.75 sec pulse) from the remote start to the (-) Driver Unlock (Blue/White) on the 455T

Lock works as expected, but pressing the Door Unlock button on the remote starter's remote causes the doors to lock, then unlock, then lock again. I have tried to open the door when it's doing this, but can't seem to catch it in time.

Has anyone seen this behavior before?

Bump? Anyone have any ideas?

What can I look for?