Date:         Sun, 30 Jun 2019 03:59:18 -0400
Reply-To:     David Beierl <dbeierl@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@GMAIL.COM>
Subject:      Re: Electrical ?
Comments: To: OlRivrRat <OlRivrRat@comcast.net>
In-Reply-To:  <C2951C4E-CFC6-4F0D-8856-24C91B535A8A@comcast.net>
Content-Type: text/plain; charset="UTF-8"

On Sat, Jun 29, 2019 at 9:17 PM OlRivrRat <OlRivrRat@comcast.net> wrote:

>
> The Slider & Rear Hatch Locks are no longer actuated by the Front Door
> Locks ~
> With the Fronts Unlocked there is +12v on the Yel wire @ Slider Connect'
> Plate to
> Grnd & Both White & Black/Red wires ~
> With the Fronts Locked there is 0v on the Yel wire @ Slider Connect' Plate
> & All 3
> (Yel, White, Red/Blk) wires show Short to Each Other & to Ground ~
>         Not sure if it matters but this is a Canadian Version Van' ~


Canadian shouldn't matter.

Your diagram is on 97.226 ff.

There are three wires that go from connector T3B near the passenger door to
handle the rear locks, and they split at T3c near the top of the B-pillar.
One branch goes to the slider contacts and the other branch to the hatch.

Operation is quite simple compared to the front doors -- there's no
checking to see if the operation succeeded.  Brown wire is always grounded,
and depending on which way the front locks are, either yellow or white is
hot.  If either actuator motor is switched to a hot wire, the motor runs
long enough to move the actuator half a turn of the internal gear, and at
the end of its travel, switch from that hot wire to the other which is not
hot at that point.  When the second wire becomes hot the motor spins for
another half-turn and switches back to the first wire.

Neither lock interacts with the other one

Applying ground to the actuator 31 terminal, and 12V to one of the other
terminals should either do nothing or cycle the actuator half a turn.

I suspect that what you're seeing as a short is really just the low DC
resistance of the motors.

I'd start by testing the individual actuators for operation in both
positions.  If they test good, then test for zero ohms between each of the
three terminals in the connector and the corresponding wire at T3b.

Broken ground wire at/near T3b or T3b unplugged will stop both rear locks.

Yrs,
d