Recently I replaced my center console and seats with ones in
better condition than my originals. I finished up the ski
slope and installed all the switches and trim and then tried
to lower the windows. Neither one would work. I have
previously cleaned the switch contacts and also taken off
the door panels and disassembled the window motors, so I’m
certain the problem is before the switch. I got out my meter
and tested thee power wire (brown/blue) that comes into both
switches. With the key on there is no power to either of
these wires. This makes me believe its the thermal breaker
or the relay. I checked the schematics and it says that the
breaker and relay are on the ps fuse block. The diagram says
the relay is on the back. I have spent about an hour pulling
every relay on the ps side and non of them seem to be the
window relay. Could some one tell me what it looks like,
maybe its color, and possibly a better description of where
its located? I searched through all the old posts and non of
them had working links to show the relay or a good
description of its location. I even tried searching for a
picture of the relay, but that also ended in failure.
Any help would be appreciated. I thought I had finally got
everything sorted out and could enjoy the car, but I may
have been overly optimistic–
89 XJS convertible, 1995 9C1 Lt1 motor, th400,pre abs brakes
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In reply to a message from boboli sent Wed 6 Jul 2016:
No idea how this ended up in lumps. That’s not the
forum I picked and is not what I intended. Any
help is appreciated but I’ve reposted this in the
XJS section–
89 XJS convertible, 1995 9C1 Lt1 motor, th400,pre abs brakes
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Andrew must be bored with the lack
of issues here to resolve. The lumps
are either abandoned or doing just fine.
Mine is the latter… ‘‘knock on
the wood on this laminate topped
work table’’.
One of the electric lessons I’ve
learned about these cars is the
following:
Brown is always on battery
power.
White is hot only with the
key in an on position.
First place to check in electric
issues is the ground path.
TV cable tech was here. Complimented
my Jaguar and it’s LT1 install.
His cars are a Corvette and a Cadillac.
The former about to receive an LS1.
Carl–
The original message included these comments:
Do you have 12volts going into the thermal breaker (on the brown wire)??? And 12volts coming out??
That’s where you start… Removing the.console shouldn’t have disturbed anything with the window power…
In reply to a message from cadjag sent Thu 7 Jul 2016:
I first had thought I had not connected all the
grounds that go to a nut on the shifter mount. So
I tested the ground wire at the switches and I do
have a good ground.
On a LHD car the relay should be behind the
passenger side fuse/relay area? I’ve looked and
looked, and did not see it. Of course I don’t know
what it looks like. There was a reference to it
being round. I found something round a behind the
dash and pulled it down. It had the words radiator
on it, so I’m guessing that’s not it. The wires
were also the wrong color.
I will check voltage at the thermal breaker, but
I’m guessing it won’t have any. It’s the 2 prong
black box thing on the far right bottom of the PS
fuse panel, correct?–
89 XJS convertible, 1995 9C1 Lt1 motor, th400,pre abs brakes
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The relay is a cubic box like unit perhaps 1" on a side and mounted a cubical electrical connector of about the same size. The connector has a slot in the side so it can be slipped over a metal tab that is part of the mounting bracket under the dash there. Once you remove the dash liner (the panel under the glove box) you should see all sorts of electrical parts and wiring there. Look closely- only one of the relays will have a white/pink, a black, and 2 brown/blue wires on it. That’s the one
The thermal breaker is mounted on the front face, extreme right of that panel with 2 wires to it: brown and brown/blue. The brown comes directly from the battery post on the firewall (inside)- it should be +12V continuous, and if the thermal breaker is good the brown/blue should be 12V continuous as well.
I first had thought I had not connected all the
grounds that go to a nut on the shifter mount. So
I tested the ground wire at the switches and I do
have a good ground.
On a LHD car the relay should be behind the
passenger side fuse/relay area? I’ve looked and
looked, and did not see it. Of course I don’t know
what it looks like. There was a reference to it
being round. I found something round a behind the
dash and pulled it down. It had the words radiator
on it, so I’m guessing that’s not it. The wires
were also the wrong color.
I will check voltage at the thermal breaker, but
I’m guessing it won’t have any. It’s the 2 prong
black box thing on the far right bottom of the PS
fuse panel, correct?–
89 XJS convertible, 1995 9C1 Lt1 motor, th400,pre abs
brakes
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[forums.jag-lovers.org]–
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Thanks for the help Andrew. I appreciate it.
I don’t have a shop manual. I only have the wiring
diagrams for 1989 Xjs that used to be on captain
Jaguar’s car house, glad I downloaded them before
they were removed. I am not an expert with wiring,
but if I take my time, I can figure most things
out. I built/ modified my lt1/ XJS harness that’s
in the car now.
I decided to give up on finding the relay and
test for power at the breaker. The white)pink wire
had batter power but the brown / blue didn’t. I
figured that the breaker must be bad or there’s a
short in the wiring to the switch. I used to have
a clicking sound coming from the PS foot well. I
wasn’t sure of the cause. I discovered it is part
of the problem I’m having. To make this short,
with the PS switch unplugged, the DS window works
fine. If I plug in the PS switch, the clicking
starts and the windows don’t work. The clicking is
from the thermal breaker.
So I must have a short in the PS wiring. Would
this be before or after the switch, since plugging
it in is enough to cause the breaker to trip. I’m
assuming it’s after.
I guess I will test the PS switch wires and see if
any of them are shorted to ground.–
89 XJS convertible, 1995 9C1 Lt1 motor, th400,pre abs brakes
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If you found the unit with a white/pink wire to the connector that’s the relay, not the thermal breaker… Look at your wiring diagram.
And get yourself a manual for the car. There’s no way to do anything on these cars without a shop manual… That’s like trying to bake a cake without a recipe…
Do you have a manual for the donor engine for the car- the Caprice book?? You should have one of those too. And only get the factory manual- 2 thick volumes…
Early on, I invested a hundred bucks for the shop manual
for the donor car that my engine and transmission came
from. In my case, a 94 Cadillac Fleetwood Brougham.
A close cousin to a Caprice of the same year.
Invaluable !!!
Carl–
The original message included these comments:
Do you have a manual for the donor engine for the car- the Caprice book?? You should have one of those too. And only get the factory manual- 2 thick volumes…
Since the breaker was tripping only when the PS switch was
connected to the wiring, I figured there is a short in that
side of the wiring. I tested the wires to the window motors
to see if they were shorted to ground and they were not. I
next tested the DS and PS switches to see if they were
operating the same. Low and behold the Ps switch has some
thing wrong internally that is causing the short. I replaced
it with a spare I had. Now the breaker isn’t tripping
anymore and the windows go up and down.
I still don’t know where the relay is, but I’m going to
leave well enough alone.
Thank for the help. I appreciate it. I will pick up the shop
manuals for the car and the motor.–
89 XJS convertible, 1995 9C1 Lt1 motor, th400,pre abs brakes
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That’s odd. My wiring diagram has the thermal breaker upstream from the relay- brown going into one side and brown/blue on the other. Brown is battery power on Jags. White and white/colors is ign hot
I think may be reading the wiring diagram incorrectly. Just because one wire crosses another on the diagram doesn;t mean they are connected. The are connected only if there is a dot at the intersection… (white/pink is used to turn the relay on and goes nowhere near the thermal breaker). Or someone has been in your car seriously messing with the wiring…
The pics below didn’t seem to work
Andrew--------------------------------------------
On Fri, 7/8/16, boboli bobolimiller@gmail.com wrote:
Subject: Re: [Lumps!] Power window help- no power to the switches