2006 lexus gx470, door locks

I installed an Audiovox Prestige APS-57a remote start & keyless entry in a 2006 Lexus GX470. Starts fine & locks & unlocks fine. 

But when I use my Audiovox transmitter to lock the doors, with engine not running, about a minute or 2 later, all the doors unlock. This doesn't happen when I use the factory transmitter on the key fob to lock the doors.

I used blue for lock & green for unlock @ DDM inside drivers door. I programmed a double-pulse for unlock.

I could not find the lock/unlock wires inside the car @ either kick panel.

One document refers to green & GREEN/ black wires in gray plug in passenger kick. The passenger door has no key cylinder for me to meter the wires.  

Anyone have any insight?

I saw a BLACK/ orange & several greens in the passenger kick panel, but there was no way for me to test them because there's no key cylinder in the passenger door, so I didn't use them.

I believe the wires I used for lock/unlock are the drivers door lock cylinder wires. So I'm simulating using the key to lock/arm & unlock/disarm.

I didn't seem to need the GREEN/ YELLOW keysense wire. My remote start doesn't set off the factory alarm. And my lock & unlock arms & disarms the factory alarm.

I think that I tried testing with the drivers door key cylinder for those wires in passenger kick. I'll try it again though.

I did see the 18-pin connector-very easy to get to.

The next day everything worked OK. I re-checked my ground. It seemed OK, but I made sure it was tight. Maybe the ground was loose. Maybe the car battery was low. Freaky things happen sometimes. I left everything alone as is.

Thanks for the suggestions.