In reply to a message from Bryan N sent Sun 2 Sep 2012:
Hi,
Interesting dialog. Here’s a few thing I know about the
‘‘operational’’ aspect of the latch box since I’ve owned the
vehicle now for about 13 years. (with the understanding
that the latch box is in a functional state)
Vehicle locked - all doors, boot and latch box are locked.
When the fuel filler lid is pressed down the lid is not
released, or won’t spring up to access the fuel cap.
Vehicle unlocked - all doors, boot and latch box are accessible (accessible for the latch box meaning you can
press down on the fuel filler lid and it will release)
The pin/plunger normal state is ‘‘away’’ from the cylinder
(solenoid) via a spring between the plunger collar and the
cylinder base, hence it is always engaging the plunger of
the fuel filler lid.
When the vehicle is unlocked, press down on the fuel filler
lid (it has a plunger on it’s underside) which in turn
applies pressure on a plate, which in turn completes circuit
to energize the solenoid, which ‘‘pulls’’ the plunger inwards
for a second (I would imagine there is a ‘‘timed’’ delay for
‘‘holding’’ the plunger), which in turn allows the fuel filler
lid to pop to the open position via spring loaded hinge.
I too have a theory, or rather a question in regards to the
photos I took of the dismantled latch box. I’m wondering if
the ‘‘mysterious missing relay’’ wasn’t a design change and is
actually part of the apparatus in my pics. Another words the
relay was made part of the fuel filler latch box system. If
you look closely (I know the pics are bad), the solenoid is
connected to a small black box via three wires, which in
turn provides the brown/slate, black and purple wires to the
harness connector. Hmm?
The good folks in charge of manuals/schematics at Jaguar
were probably sick and tired of trying to keep up with
everything and said ‘‘To hell with it!, I’m not doing it
anymore!’’
What do you guys think?
I’m going to send Don and Bryan some additional pics of the
disassembled latch mechanism in a private email due to the
length of time it takes J-L.com to review and post pics.
I’ll will post up the photos later today for everyone.–
The original message included these comments:
You will notice that the solenoid gets battery voltage
directly from fuse 13 in the left side fuse box on the
Brown/slate wire, not via that relay. I believe that within
the blank white rectangle shown in the schematic inside the
‘filler flap interface’ unit there is a switch which is
activated when the filler flap is pressed down and that puts
the other side of the solenoid coil to ground momentarily on
the Black wire to withdraw the plunger to allow the filler
flap to pop open. There is no continuous drain on the
battery because as the filler flap opens, it disengages the
switch.
–
Rob Evenson, '89 XJ40/XJ6
Mobile, AL, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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