OK. Thanks everyone for your patience and your help. Especially, you, CDULUK. Per instructions I removed the interior lower (carpet covered) panel in the rear hatch door. I followed the only wire coming from the lock itself to a junction just inside the panel. (see figure 1). Arrow on the wire points toward the lock mechanism.
Figure 2 pictures the lock assembly unbolted, the red arrow points to the other end of the wire from figure 1 going into the lock assembly itself.
Figure 3 is a picture of the lock assembly from the other side. The red arrow points to the wire going into the lock assembly. You can barely see it. Also note the position of the black ‘lock’ itself right in the middle of the picture. This is UNLOCKED.
Figure 4 is the same as figure 3 except the position of the lock in the middle of the picture (circled in red) is in the LOCKED position. This is quite easy to do by hand and this is the ‘hole’ I originally put the bungee cord into to secure the trunk lid while driving with that stupid piece of luan.
For what it’s worth, all doors will lock just fine from the driver’s inside control.
However, the dashboard ‘open door’ warning light does not go off. It stays lit and now on day 3 has drained my battery. The anti-theft alarm does not arm itself and the dome lights if set in the ‘door’ position, remain on. It’s my habit to keep these in the ‘off position’ all the time because if I leave the car door open for any length of time it has a tendency to drain my battery.
Just to repeat myself in case you’re not sick of me yet, when I try the button on the key to lock the car, I just get the warning signal that a door is open(lasts for 10 seconds or until I hit another button).
The back door actuator seems to be fine. Not sticking. It locks both from the drivers door lock button, or by inserting the key and turning it. All of the doors and windows will unlock (and roll down) using the remote keyless entry button on the key.
This is the part I think I need: http://www.toyodiy.com/parts/p_U_200001_LE...GKA_8424.3.html
One issue that comes up is if the part is the one I need and it’s the one pictured in my digital pictures I can only see the ‘clip’ end of it. The other end (or the wire anyway) goes into the lock itself which appears to be a closed system. I don’t’ see any way to take the lock itself apart to get to the part to replace it.
Your advice is greatly appreciated.