Toyota Repair: 1999 Sienna power sliding door problem, service bulletins, motor assembly


Question
The power sliding door on my 1999 Sienna will open just fine, but not close.  Using any of the 3 buttons in an attempt to close the door, all you get is a click.  My dealership has told me that the entire motor needs to be replaced for nearly $2000 because the "motor will go bad".  It sounds to me like the door just doesn't unlatch or catch for the motor to be able to pull the door closed.  In researching this problem, I have run across a part that I think maybe what I need. I have seen it given two different names, a Latch Release Actuator or Door Lock Release Motor Assembly, but the same part number, 85620-08061.  Does this part exist or work on a 1999 model and does it sound like it might be what I need?

Answer
Toyota had issued a few service bulletins in the past but here is a post from someone who seemed to have the same issue:
Replying to: sienna_andy (Oct 02, 2009 9:19 am)
Just to give a quick update. I did successfully diagnose and fix the problem that a few of us described. To briefly restate the problem for anyone searching, the interior and exterior handles do usually succesfull engage the automatic sliding door, but the door would not open using the key fob, pillar button or front button. The problem as familymandan surmized was related to the door latches not releasing.

Comparing my working door to my non-working door, it was easy to see that there was a small motor that was not activating. Normally, it activates when any button is pushed and even when the interior and exterior handles are pulled. (When the handles are pulled it's actually redundant, because the handles also manually release the latches.)

I found an interior door diagram over at tundrasolutions.com and identified the part by name as the "Door Lock Release Motor Assembly". Toyota sold me the part for $103.09, which seemed better than scouring the junkyards for me. The Toyota part number is 85620-08061. It's basically just below the window motor, and it's pretty obvious from the cables that it actuates the door latches.

Before ordering the part, I unplugged the motor and stuck my multimeter into the feed to make sure it was getting power. Sure enough it was getting juice, but was dead as a doornail.

Got the part plugged it (just while holding it) to test if the new motor would solve the problem, and was pleased to see that it was a clean fix. The last step, obviously was getting it installed. It's a bit of a pain to replace because the motor screws into the sliding door atachment control panel from the back side. The only way to remove that panel is to disconnect the window. This made me slightly nervous, but it really wasn't that bad. Working slowly and carefully to pay attention to how all the trim goes back it probably took a little under 2 hours to replace the motor.

All is working great now