[xj] trip computer

My trip computer in my '84 xj6 has never worked since I purchased the
car two years ago. The bottom lights go on but the display never lights
up. If possible could someone tell me the best way to remove the unit
and also how I might go about attempting to repair it.
Thanks,
Jesse
Hathaway

My trip computer in my '84 xj6 has never worked since I purchased the
car two years ago. The bottom lights go on but the display never lights
up. If possible could someone tell me the best way to remove the unit
and also how I might go about attempting to repair it.

This probably won’t fix your problem, Jesse, but once when my battery went
dead and I was forced to jump start the car, the trip computer quit working
and exhibited the exact same symptoms. I disconnected and then reconnected
the negative lead on the battery and viola! the computer started working fine
again.

Steve Clements
85 VdPOn 1/24, Jesse Hathaway wrote:

Jesse:

My trip computer in my '84 xj6 has never worked since I purchased the
car two years ago. The bottom lights go on but the display never lights
up. If possible could someone tell me the best way to remove the unit
and also how I might go about attempting to repair it.

I know diddily on how to fix your computer but to remove it from the panel
you must remove the wood surround. DON’T try to pry out the instrument with
a screwdriver, knife, or awl; you’ll just ruin the wood. Remove the
heating/AC dials by pulling them off, then (if I can remember the sequence)
unscrew the collars underneath. Then remove the cosmetic plate and you’ll
see (if I remember right, three screws) positioned on top of the radio.
Unscrew these and lift out the wood surround from the bottom where the
screws you just removed were (you may have to push up a bit on the panel,
as through you were lifting breasts, to give you enough clearance over the
radio). The radio, BTW, does not have to come out. When this wood surround
is out, you’ll see how the trip computer nests into its window. Squeeze
the clips on the sides of the computer and push the unit through its window
in the wood surround. Electrical connections are ganged, so they’re easy to
disconect and re connect.

Good luck
Ralph

YOu should not need to remove the whole dash jsut to get the trip
computer out. This seems like far more work, than just pulling it out of
its slot. The trip computer is not held in very tightly. Prying it out
is probably a good way to wreck your wood, but pulling it straight out
shouldn’t hurt anything.

Noah
83 XJ6

Jesse:

From the XJ FAQs:
The early 1985 and earlier trip computers are susceptible to hanging caused
usually by a low-battery condition - if the battery is at all weak, while
cranking the engine the voltage will droop enough to mess up the computer,
but not enough to give it a clean reset. You need to pull the fuse and put
it right back - that’ll reset the computer and clear the hang.
Alternatively you can briefly disconnect the battery. If this keeps
happening you may have a weak battery.

David>>My trip computer in my '84 xj6 has never worked since I purchased the

car two years ago. The bottom lights go on but the display never lights
up. If possible could someone tell me the best way to remove the unit
and also how I might go about attempting to repair it.

The trip computer in my 84 seriesIII shows garble. It does so even with
a new battery. I swapped it with the one in my 86, and the one from the
84 works fine in my 86, so it is not the trip computer itself. Is there
a relay or something else that would account for this?

Bob-
There is a module in the trunk (boot) located to the left of the ECU, which converts the injector pulses to a signal for use by the trip computer. I had this problem years ago. I solved it by re-soldering the components to the PCB in this module. It uses a single sided PC board, so long period of vibration (lik, in a car) cause the parts to vibrate and crack the solder around the component leads, resulting in improper operation.
Good luck!
Hunt

At 11:44 AM 7/22/98 -0400, Bob Dierker wrote:

The trip computer in my 84 seriesIII shows garble. It does so even with
a new battery. I swapped it with the one in my 86, and the one from the
84 works fine in my 86, so it is not the trip computer itself. Is there
a relay or something else that would account for this?

H u n t D a b n e y & A s s o c i a t e s
Electronic System Development and Design-----------------------------------------------
http://users.deltanet.com/~hdabney/
fax: (714) 540-8131

Tidying up some of the interior details that need attention on my '86 SIII,
I noticed that the trip computer lights do not illuminate all the buttons at
night, nor the lettering that identifies them. Should the buttons light
dimly or the identification for each be illuminated? I’m assuming that
there must be a fiber optic cable that runs up there. I’ve had some
problems investigating this because I’ve been having trouble getting the
plate surrounding the radio removed. I have the original radio in the car,
with the single knob on the left. I’ve been to the archives and read
several posts regarding the access to the screws hold the center dash in
place. But after removing the nuts around the a/c controls, the plate still
seems to be held on by the radio’s faceplate and I can’t for the life of me
see how this comes off. Anybody have any information on the illumination of
the computer and the removal of the dash to gain access to this area? Do I
have to remove the radio? Will I have to remove the trip computer? Or will
all slide out with the central dash section? Any suggestions or advice
greatly appreciated.

Regards,
Tom Golodik
@Tom_Golodik

Marcus wrote: "My trip computer suddenly stopped working this weekend
on my '82 XJ6. Whenever I push the button to reset
it, it’s hard to push and the numbers won’t reset to
“000.” Other than that, the odometer works just fine.

Can anyone offer any suggestions?"

I think you are technically talking about the trip odometer which is located
inside the speedometer. The trip computer is the electronic gadget that
calculates our fuel mileage and average speed etc. and is located on the
center dash just below the center a/c vent. You may not have a computer if
yours is an early '82.
My trip odometer has never worked since I have owned the car but I did take
the speedometer out one time and took it apart to tried to fix it. I got it
to work for a while and then it broke again. The problem is with the reset
button which when pressed in is supposed to reset the mileage to 000. I bet
if you got a used speedometer in the junk yard (breaker for the English) you
could take the mechanicals for the trip odometer out and transplant the whole
mess into your nice 140 mph unit.
Just a thought…

John T. in STL
84 xj6

I am sure someone out there has solved these problems: 1) trip computer
nomenclature strip not illuminated: Is there a way of replacing a bulb? Is
it a bulb?
2) three of the buttons do not illuminate (the three for time, reset and ?
can’t remember the other, but the three at the right hand end). Is this
related to #1 above (unlikely, I know). Help please.
Gregory

It’s not too difficult. First, gently pry the computer from
the dash and
disconnect it. When you get it out you’ll see two small
philips head screws
and two small nuts on the back cover, remove them. Then
there is a black
plastic grommet/wire holder, using a pair of pliers gently
squeeze it and
withdraw it from the casing, you can then remove it so the
wires can pull
through the case. Inside you’ll see two circuit boards,
there are two more
nuts to remove on the rear board. Remove the cardboard, it
may stick a little
to the wires. Then work the boards loose and separate them
from the trip
computer facepiece, be sure not to loose the plastic
insulators. Then you can
pop open the switches and solder new bulbs in place and
reassemble.

“Dr. Gregory Andrachuk” wrote:> I am sure someone out there has solved these problems: 1) trip computer

nomenclature strip not illuminated: Is there a way of replacing a bulb? Is
it a bulb?
2) three of the buttons do not illuminate (the three for time, reset and ?
can’t remember the other, but the three at the right hand end). Is this
related to #1 above (unlikely, I know). Help please.
Gregory

Hello all,

I am new to the list. After waiting 18 years, I finally bought the car I
wanted to buy the day it came out. A 1983 XJ6 Series III. I suspect the
one I saw in 1983 had fewer problems than the one I bought a few months ago.
However, it is a great car. I was able to find one with a new engine (about
8K miles) and a rebuilt transmission.

I would like to start by thanking all of you who frequent the list as I
have been using the archives for the past couple of months to do everything
from source parts to trouble shoot some of the unique quirks of the 83. It
has been an outstanding tool and greatly appreciated. And for the most
part, I have been able to get things working.

I recently purchased a used trip computer from one of the main suppliers who
is often mentioned on the list. It works great most of the time. About
every three or four times I start the car however, it will be either locked
up with a strange sequence of numbers or half numbers or totally dark. All
attempts at resetting it using the buttons are unsuccessful. To reset it, I
slide it out of the dash and disconnect and reconnect the black clip and it
is fine. I can’t figure out if there is a problem with the trip computer or
the car is sending a spurious voltage at start-up (which I suppose could
have killed the first one-which was already dead when I bought the car).

Does anybody have any ideas on what could be causing this on again, off
again trip computer?

Thanks for any help

Dale
XJ6 Series III===================================================
The archives and FAQ will answer many queries on the XJ series…
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My trip computer in the 83 has a bad slide switch, the one that swaps from
mph to kph (the one I never would use) and it causes similar problems to
what you describe. Sometimes if I wiggle the switch it comes back, others
it won’t come back at all for days. Since this switch is so seldom used it
may be easily missed. Try wiggling it when the problem is happening…

T. R. Dearden

82, 83 XJ6> I recently purchased a used trip computer from one of the

main suppliers who
is often mentioned on the list. It works great most of the
time. About
every three or four times I start the car however, it will be
either locked
up with a strange sequence of numbers or half numbers or
totally dark. All
attempts at resetting it using the buttons are unsuccessful.
To reset it, I
slide it out of the dash and disconnect and reconnect the
black clip and it
is fine. I can’t figure out if there is a problem with the
trip computer or
the car is sending a spurious voltage at start-up (which I
suppose could
have killed the first one-which was already dead when I
bought the car).

Does anybody have any ideas on what could be causing this on
again, off
again trip computer?

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

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Hi! ALL
Can any one tell me how can I use my trip computer properly(Instruction,
brochure etc.)

Best regards

Atif Tezerten
Istanbul,Turkey
1986 XJ6 SIII===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
Archives: http://www.jag-lovers.org/lists/search.html

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Dear all,

As you may have read in another posting my new toy has a trip
computer. Assuming it still works, can it be transferred to my
Sovereign to replace that silly clock? I know I need a new panel, but
is the wiring loom suited (ie. can I just plug it in)? I guess it
would be a pain to do if it weren’t?

thanks,–
Arnoud

Imac, therefore I am

http://www.se7en.nl

(temporarily from different Imac until I’ve got DSL…)

1973 Daimler Double-Six
1989 Jaguar Sovereign HE
1983 XJ-S parts car

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

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No, you cannot just plug it in because there is nothing to plug it in to.
The computer has to receive information from somewhere; the clock does not.
Gregory----- Original Message -----
From: “Arnoud” jaguar@se7en.nl
To: xj@jag-lovers.org
Sent: Thursday, January 24, 2002 3:31 PM
Subject: [xj] trip computer

: Dear all,
:
: As you may have read in another posting my new toy has a trip
: computer. Assuming it still works, can it be transferred to my
: Sovereign to replace that silly clock? I know I need a new panel, but
: is the wiring loom suited (ie. can I just plug it in)? I guess it
: would be a pain to do if it weren’t?
:
: thanks,
: –
: Arnoud
:
: Imac, therefore I am
:
: http://www.se7en.nl
:
: (temporarily from different Imac until I’ve got DSL…)
:
: 1973 Daimler Double-Six
: 1989 Jaguar Sovereign HE
: 1983 XJ-S parts car
:
: ===================================================
: The archives and FAQ will answer many queries on the XJ series…
: FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
: Archives: http://www.jag-lovers.org/lists/search.html
:
: To remove yourself from this list, go to
http://www.jag-lovers.org/cgi-bin/majordomo.
:

===================================================
The archives and FAQ will answer many queries on the XJ series…
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Archives: http://www.jag-lovers.org/lists/search.html

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I need to figure out why a red wire to battery power in our 86, that appears
in the radio connector, seems to have gone open and affected the Trip Comp.
too. How does one pull out the TC? Our SIII manual is apparently for the
very earliest SIIIs. Thanks,–
Alex
79xj6L SII (BRG + wires)
86xj6 SIII (Black)
61 Sprite MkII (Red)
Menlo Park, Calif.

// list policy dictates that messages be trimmed

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Removing the Trip Computer? First, I drill in a couple of sheet metal screws
and then get my slide hammer and…just kidding, just kidding!

Actually, Alex, I think it’s just a press fit into the panel and can be
wriggled out from the front. Perhaps there are a couple of
press-in-to-release retaining tabs?

Doug Dwyer
Longview, Washington USA

I need to figure out why a red wire to battery power in our 86, that
appears
in the radio connector, seems to have gone open and affected the Trip
Comp.
too. How does one pull out the TC? Our SIII manual is apparently for the
very earliest SIIIs. Thanks,

// list policy dictates that messages be trimmed----- Original Message -----
From: “Cannara” cannara@attglobal.net

The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
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I need to figure out why a red wire to battery power in our 86, that
appears
in the radio connector, seems to have gone open and affected the Trip
Comp.
too. How does one pull out the TC? Our SIII manual is apparently for the
very earliest SIIIs. Thanks,

Just grab and pull. A plastic putty knife may help you work it out.

// list policy dictates that messages be trimmed===================================================
The archives and FAQ will answer many queries on the XJ series…
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At 09:38 PM 6/5/02 -0700, Cannara wrote:

I need to figure out why a red wire to battery power in our 86, that appears
in the radio connector, seems to have gone open and affected the Trip Comp.
too. How does one pull out the TC?

Alex,

I have one in my hands here and each side has a set of spring steel tabs
holding it in place. It looks like a well placed pull will pop it right
out. Careful with the wood.

I still have your belts and rear panel keeping warm here.

Scott

// list policy dictates that messages be trimmed===================================================
The archives and FAQ will answer many queries on the XJ series…
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Archives: http://www.jag-lovers.org/lists/search.html

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