[xj] Series 2 Central locking

XJ
1

My XJC (1977) central locking has not worked since I got the car twelve
months ago. So I thought I would rectify it while the interior is out for a
Leatherique overhaul. I managed to trace all wiring and find the bits and
pieces but can’t get the central locking to work. Push the rocker switch
and no response at all. Help please!

All individual components seem OK. I dismantled and cleaned the switch and
checked its operation. The door lock solenoids work if I apply power to the
wires in the centre console. The Thermal Circuit Breaker works OK. I can
hear the two relays (inside the rear seat cross member) click when I apply
power to the leads.

If I hook up the main orange /green (lock), orange/red (unlock) and brown
power wires direct to the switch (bypassing the relays circuit) the central
locking works fine. But if I connect it all up correctly nothing happens?

Questions
1; What is the correct wiring sequence to the console switch? The switch
has six numbered terminals and there are four wires.
2: If I can get the relays to click by providing power to them are they OK?
3; Can I bypass the relays and leave them disconnected for the long term
3; Any other suggestions as to what could be wrong?

My last alternative is to throw the whole Jag system out and replace it with
the central locking that is an option with the new high tech
immobiliser/alarm system I am having fitted next week. Comments and
experience would be appreciated.

Cheers, Don

Don Lewis
Jaguar XJC 5.3 1977
Melbourne, Australia
http://home.iprimus.com.au/mailme/jaguar===================================================
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2

If I hook up the main orange /green (lock), orange/red (unlock) and brown
power wires direct to the switch (bypassing the relays circuit) the
central
locking works fine. But if I connect it all up correctly nothing happens?

Well, it sounds to me as though the relays are your problem.

Questions
1; What is the correct wiring sequence to the console switch? The switch
has six numbered terminals and there are four wires.

My wiring diagram doesn’t show the terminals numbers, sorry.

2: If I can get the relays to click by providing power to them are they
OK?

No. The click just means that the control portion of the relay is working.
It is entirely possible that the output portion of the relay(s) is
inoperative. Lots of guys have sucessfully opened up and repaired relays.
Often the contacts are pitted or need a bit of adjusting. I’m betting this
is your problem.

3; Can I bypass the relays and leave them disconnected for the long term

No. The lock solenoids draw a pretty fair amount of current and your switch
would probably overheat. Of course, that’s the whole idea of having the
relays to begin with. They provide the high-amp current to the lock
solenoids so the switch can remain low amp.

3; Any other suggestions as to what could be wrong?

No, not after considering that all is working with the relays bypassed.

My last alternative is to throw the whole Jag system out and replace it
with
the central locking that is an option with the new high tech
immobiliser/alarm system I am having fitted next week. Comments and
experience would be appreciated.

Sounds OK to me as far as the locks go. I can tell ya some real horror
stories about “high tech” alarm systems, though !
But, that’s for another day :slight_smile:

Cheers,
Doug----- Original Message -----
From: “Don Lewis” dlewis@paraquad.asn.au

===================================================
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3

Are there actually relays, or are the solenoids simply bi-directional? I
don’t recall finding any lock relays on our SII.

(He who is too lazy to go look at the circuit diagram out in the car).–
Alex
79xj6L SII (BRG + wires)
86xj6 SIII (Black)
61 Sprite MkII (Red)
Menlo Park, Calif.

Doug Dwyer wrote:

----- Original Message -----
From: “Don Lewis” dlewis@paraquad.asn.au

If I hook up the main orange /green (lock), orange/red (unlock) and brown
power wires direct to the switch (bypassing the relays circuit) the
central
locking works fine. But if I connect it all up correctly nothing happens?

Well, it sounds to me as though the relays are your problem.

Questions
1; What is the correct wiring sequence to the console switch? The switch
has six numbered terminals and there are four wires.

My wiring diagram doesn’t show the terminals numbers, sorry.

2: If I can get the relays to click by providing power to them are they
OK?

No. The click just means that the control portion of the relay is working.
It is entirely possible that the output portion of the relay(s) is
inoperative. Lots of guys have sucessfully opened up and repaired relays.
Often the contacts are pitted or need a bit of adjusting. I’m betting this
is your problem.

3; Can I bypass the relays and leave them disconnected for the long term

No. The lock solenoids draw a pretty fair amount of current and your switch
would probably overheat. Of course, that’s the whole idea of having the
relays to begin with. They provide the high-amp current to the lock
solenoids so the switch can remain low amp.

3; Any other suggestions as to what could be wrong?

No, not after considering that all is working with the relays bypassed.

My last alternative is to throw the whole Jag system out and replace it
with
the central locking that is an option with the new high tech
immobiliser/alarm system I am having fitted next week. Comments and
experience would be appreciated.

Sounds OK to me as far as the locks go. I can tell ya some real horror
stories about “high tech” alarm systems, though !
But, that’s for another day :slight_smile:

Cheers,
Doug

===================================================
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4

Cannara wrote:

Are there actually relays, or are the solenoids simply bi-directional? I
don’t recall finding any lock relays on our SII.

(He who is too lazy to go look at the circuit diagram out in the car).

Seeing that my car is a heap of exposed wires and no panels right now and not a relay in
sight, I might tend to agree with you Alex.

Scott
'79 SII XJ6L===================================================
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5

Thanks for the feedback Doug. I agree that the relays may be the problem.
I thought that because I could get a click sound out of the by applying
power they were OK but obviously not. I am probably going to remove all the
25 year old Jag central locking and replace it with a new system to provide
remote central locking with the new alarm.

In answer to Alex question, yes there are two relays. If you don’t know
about them you would never find them. I didn’t know about them until I
applied power to a wire and heard a mysterious click that sounded like it
was under the car instead of in the doors! After following the sound I
found it was coming from inside the rear seat cross member. The relays are
hidden inside! You have to rip the carpet off the cross member to access
them. I have only just finished recarpeting and didn’t even notice the
access under the insulation. I don’t really want to rip the new carpet up
(its glued down at this spot) to get to the relays.

Cheers Don
Don Lewis
Jaguar XJC 5.3 1977
Melbourne, Australia
http://home.iprimus.com.au/mailme/jaguarDate: Sun, 26 Aug 2001 22:53:29 -0700
From: Cannara cannara@attglobal.net
Subject: Re: [xj] Series 2 Central locking

Are there actually relays, or are the solenoids simply bi-directional? I
don’t recall finding any lock relays on our SII.

(He who is too lazy to go look at the circuit diagram out in the car).

Alex

===================================================
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6

I have a SII Daimler. My central locking was not working when I bought it,
but it wasn’t too difficult to lift out the rear seat and clean the contacts
on the relays. Works perfectly now. I asked an auto-electrician if he
could rig up the original system to a remote key-fob unit. He said it would
be easy enough and would cost around �120.

That’s what I intend to do, but if anyone on the list can provide details on
how to do-it-myself (with a kit or something as I am electrically shorted),
I would be much obliged.

Paul.
1974 Daimler66VdP (with worn keys and lock barrels)> -----Original Message-----

From: owner-xj@jag-lovers.org [mailto:owner-xj@jag-lovers.org]On Behalf
Of Don Lewis
Sent: 28 August 2001 02:00
To: XJ Lovers Mailing List
Subject: Re: [xj] Series 2 Central locking

Thanks for the feedback Doug. I agree that the relays may be the problem.
I thought that because I could get a click sound out of the by applying
power they were OK but obviously not. I am probably going to
remove all the
25 year old Jag central locking and replace it with a new system
to provide
remote central locking with the new alarm.

===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/xjfaq.html
Archives: Jag-lovers Forums - Jag-lovers

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7

Paul, I’ve installed a few “RKE’s” (Remote Keyless Entry) over the years.
Every “kit” I’ve ever used came with instructions
(page-after-page-after-page) which describe how to install it with just
about every possible type of existing configuration.

I’ll bet if you buy a kit and couldn’t figure it out “someone” could walk
you thru the wiring changes, via e-mail…

Doug Dwyer
Longview, Washington USA

I have a SII Daimler. My central locking was not working when I bought
it,
but it wasn’t too difficult to lift out the rear seat and clean the
contacts
on the relays. Works perfectly now. I asked an auto-electrician if he
could rig up the original system to a remote key-fob unit. He said it
would
be easy enough and would cost around �120.

That’s what I intend to do, but if anyone on the list can provide details
on
how to do-it-myself (with a kit or something as I am electrically
shorted),----- Original Message -----
From: “Paul Clarkson” p.c.clarkson@ntlworld.com
I would be much obliged.

===================================================
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8

Playing hide and seek!
Yep, I never would have found them except for the clicking. They are
located inside the LH side of the rear seat crossmember just to the left of
the transmission tunnel. With carpet and insulation in place you wouldn’t
know they were there. They are shown on the wiring diagram and in the parts
manual but no way you would find them. Learning something new every day.
Don
Don Lewis
Jaguar XJC 5.3 1977
Melbourne, Australia
http://home.iprimus.com.au/mailme/jaguar-----Original Message-----
From: Scott Fraser [mailto:kn6f@dolphinsci.com]
Sent: 28 August, 2001 12:18 PM
To: Don Lewis
Cc: XJ Lovers Mailing List
Subject: Re: [xj] Series 2 Central locking

Don Lewis wrote:

In answer to Alex question, yes there are two relays. If you don’t know
about them you would never find them. I didn’t know about them until I
applied power to a wire and heard a mysterious click that sounded like it
was under the car instead of in the doors! After following the sound I
found it was coming from inside the rear seat cross member. The relays
are
hidden inside! You have to rip the carpet off the cross member to access
them.

YIKES! I have my entire car apart at this moment and still would never have
found them.
What a GREAT bit of information. I’ll be sure to locate them now and make
sure they are
functioning properly before the interior goes back in.

I’m trying to picture the rear seat crossmember, but now that I know that
they are
lurking somewhere back there, I’m sure I’ll find them.

Thanks,

Scott
'79 SII XJ6L

===================================================
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9

Thanks Don, I didn’t notice them even when I took out the seat and the
insulation last year!–
Alex
79xj6L SII (BRG + wires)
86xj6 SIII (Black)
61 Sprite MkII (Red)
Menlo Park, Calif.

Don Lewis wrote:

Playing hide and seek!
Yep, I never would have found them except for the clicking. They are
located inside the LH side of the rear seat crossmember just to the left of
the transmission tunnel. With carpet and insulation in place you wouldn’t
know they were there. They are shown on the wiring diagram and in the parts
manual but no way you would find them. Learning something new every day.
Don
Don Lewis
Jaguar XJC 5.3 1977
Melbourne, Australia
http://home.iprimus.com.au/mailme/jaguar

-----Original Message-----
From: Scott Fraser [mailto:kn6f@dolphinsci.com]
Sent: 28 August, 2001 12:18 PM
To: Don Lewis
Cc: XJ Lovers Mailing List
Subject: Re: [xj] Series 2 Central locking

Don Lewis wrote:

In answer to Alex question, yes there are two relays. If you don’t know
about them you would never find them. I didn’t know about them until I
applied power to a wire and heard a mysterious click that sounded like it
was under the car instead of in the doors! After following the sound I
found it was coming from inside the rear seat cross member. The relays
are
hidden inside! You have to rip the carpet off the cross member to access
them.

YIKES! I have my entire car apart at this moment and still would never have
found them.
What a GREAT bit of information. I’ll be sure to locate them now and make
sure they are
functioning properly before the interior goes back in.

I’m trying to picture the rear seat crossmember, but now that I know that
they are
lurking somewhere back there, I’m sure I’ll find them.

Thanks,

Scott
'79 SII XJ6L

===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/xjfaq.html
Archives: Jag-lovers Forums - Jag-lovers

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10

Don Lewis wrote:

In answer to Alex question, yes there are two relays. If you don’t know
about them you would never find them. I didn’t know about them until I
applied power to a wire and heard a mysterious click that sounded like it
was under the car instead of in the doors! After following the sound I
found it was coming from inside the rear seat cross member. The relays are
hidden inside! You have to rip the carpet off the cross member to access
them.

YIKES! I have my entire car apart at this moment and still would never have found them.
What a GREAT bit of information. I’ll be sure to locate them now and make sure they are
functioning properly before the interior goes back in.

I’m trying to picture the rear seat crossmember, but now that I know that they are
lurking somewhere back there, I’m sure I’ll find them.

Thanks,

Scott
'79 SII XJ6L===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/xjfaq.html
Archives: Jag-lovers Forums - Jag-lovers

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11

Last week I posted a query about the possible causes of my XJC’s central
locking not working. Thanks for all your responses, I received some very
helpful hints, especially from Doug. So I thought I would provide some
details on the outcome.

After taking on board the answers from the list and much testing, grunting,
and swearing I came to the conclusion that all my central locking components
were OK except the mysterious relays hidden inside the rear seat cross
member. The answer to getting it working was to bypass the original relays
and hook the original central locking wiring up to the optional circuit on
my new alarm/imobiliser system. The new alarm module has its own relays to
handle the central locking.

This now provides remote central locking at the touch of a button as part of
the arm/disarm of the alarm (just like a modern car). The only down side is
that the system does not work from the original switch on the centre
console. But hey, the car only has two doors and it aint hard to lock the
doors from inside if you need to.

This could have been an expensive way to get the central locking working and
will not the answer for everyone, but I was already having the
alarm/imobiliser fitted and the extra labour for the wiring only cost $22.

Don Lewis
Jaguar XJC 5.3 1977
Melbourne, Australia
http://home.iprimus.com.au/mailme/jaguar===================================================
The archives and FAQ will answer many queries on the XJ series…
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