Probably electro-mechanical.  I've had to deal with two of these in the
past year or so.   The mechanism strikes me as rather bizzare, and built to
work reliably only when well lubricated and not very worn.  I have to admit
that I don't understand how one could get into a reliably out-of -phase
condition.
   There is a little spring loaded pin that slides back and forth and drops
into a detent at each end.  This area must be lubricated well.  Upon close
inspection you may also find a slight ridge in the casting that interferes
with the pins motion when you are unlucky.  Changing the shape of the
casting slightly with a file or Dremel will improve operation.

Have fun,
Larry A.

On Tue, Jul 21, 2015 at 3:14 PM, James <jk_eaton@hotmail.com> wrote:

> Hmm, my hatch lock has developed a quirk of being 'out of phase' with
> the other locks - it will miss a 'locking' stage, and after that, when
> the other doors lock, it will unlock, and vice versa.  Sometimes
> unlocking it by turning it all the way clockwise will reset it, other
> times it will reset if left in the vertical position, and once I locked
> and unlocked it by pushing on the locking arm manual (i.e., not closing
> the hatch, just pushing on the mechanism) and that reset it.
>
> Is this also likely due to the badly worn keys, or should I also be
> looking at the lock cylinder, or the
> electro-mechanical parts?
>
> James
> Ottawa, ON
> '91 Multivan Weekender
>
> > Date: Mon, 20 Jul 2015 23:11:08 -0500
> > From: vwcarlocks@HOTMAIL.COM
> > Subject: Re: Hatch Lock
> > To: vanagon@GERRY.VANAGON.COM
> >
> > Generally the issues that you are experiencing are caused by worn keys.
> A code cut key cut correctly....not a duplicate...will go a long way in
> solving those issues.  Filing the wafers as suggested might work, but it
> does compromise the lock and doesn't really address the issue.  Very seldom
> do we see Vanagon locks worn to the point of not working correctly.  It's
> almost always a key issue.  We've had probably a half dozen just in then
> last week that were solved that way.
> > Steve Sandlin, Regsitered Locksmith
> >
>
>