hey everyone i really need help no one has gotten back to me on my other thread so i thought i would start with 1 problem at a time i have a 93 jag xj40 i just picked up with 187,000 miles runs great but alot of electrical problems none of my windows worked i checked the fuses they are good i noticed the last owner rigged a seperate switch to operate the drivers side ft window after getting rid of that butchery i looked at the master switch and the plastic underneath is melted does the master switch control all the windows becuse the individual windows do not operate on there individual switches do i assume if i replace the master the other windows will work again,also all of a sudden when i push my brake pedal the brake light and the abs light comes on system has plent of fluid,pads are only 1/3 worn what do i look for thanks for the help in advance

 

jsmolin:
I don't feel quite qualified to give mechanical advise to a mechanic! But... in my limited experience, quite a number of the electrical issues described here and in your other post are influenced by either relays or fuses - some of which might not throw a trouble code to the VCM. That may be what is happening with your retractible antenna. There is a relay in the trunk of my '91, not sure where yours is located IF that's even the problem. I also cannot say why your wipers should only work on high, but the reason for them not parking is due to a parking microswitch in the housing located in the engine compartment just below the wiper. It's a cheap part and no work to fix: but that generally does fix the parking problem. The ABS light might be due to flaky ABS sensors. Thats the extent of my non-knowledge for what its worth. Others will comment. Best of luck! Scott

 

thank you and i hope to hear more on this from you guys thanks again

 

The driver's door switchpack melted does not sound good.

The BRAKE/ABS light flashing ON is probably a failed pressure accumulator so the pump has to operate every time the pedal is applied (No residual pressure)

You should probably list the faults in a column of problems rather than a paragraph running all of them together. It would be easier to see each fault on a separate line.
Some people have experience with certain issues that are common to these vehicles but cannot answer all the questions!!

bob gauff

 

first im sorry for the run on sentence. second i just found out the car is actually a 92.
1)no windows work master switch is melted fuses are good
2)no power door locks
3) brake light and abs light comes on when i depress the brake for about 5 seconds
4)no heat anywhere but demister and doesnt blow that hard no a/c at all
5)wipers omly work on high and do not park
6)dr side heated seat inop light comes on on the switch but no heat
7) cruise control light comes on but will not set(work)
8) when i use the vcm the only fault i get is fuel fail 24 what is it
thank you all in advance this is my first jag i always wanted one and got this cheap it runs awesome just has a ton of electrical problems. i have a mechanic backround on imports(mercedes,bmw,porsche,ferrari,even rools but have never played with a jag hoping there are some tricks thanks again jon

 

Where in NH are you? I am in NH as well, I may be able to help you out.

 

im in alton

 

Check both fuse boxes,check for water getting into them ( if you remove the plastic cover on the cowl you might find rust on the fenders which lets water soak and then corrode the connections inside the boxes) if so replace and i think most of your electrical gremlins will be gone

 

thank you i will look at that tommorow

 

FF 24 is Ignition Drive Circuit fault.
No heat is probably the rotary flap servos and/or vacuum problems.
Wiper fuse under the passenger dash for the park circuit or failed micro switch in the wiper motor assy.
There was a TSB for upgrading the wiper park fuse from 7.5 amp to 10 amp or something like that.
The Blue Hella relays are known for all sorts of problems so check them for circuits in question.
Door lock actuators fail but can be replaced without the entire latch.

The VCM will only display one fault at a time. You pull the instrument panel fuse in the center console cubby (FUSEBOX #3) with the ignition ON, engine OFF and watch the speed and tach. When the needles fall below zero, you install the fuse and read the VCM again. The display will go to the next fault (unless that is the only fault)

You need to get an electrical guide for diagnosis and publication S-91 for engine management faults. I uploaded the S-91 to a site for this forum but you will need to contact a moderator for download access.

Most of these faults are common and answers can be found with a search of this forum and others but it is a time consuming endeavor.

Cruise control fault might be the DUMP VALVE. I have had several fail and the vacuum leaks through the valve.

bob gauff

 

what is the ignition drive circut fault mean, becuase the car runs great,its all the electrical gremlins i am having problems with is this just another gremlin and thank you again

 

The S-91 engine management guide is all the info you need for all the VCM codes.
It has DTC meanings and guided diagnostics.

Contact a moderator to see if you can get the download!!

bob gauff

 

ok i got the door locks to work i found a bad wire going to the lock module but i have checked everything and still cant get the windows to work checked the ecu and grounds found no prob. i noticed the plastic backing on the master switch is melted does the master window switch some how control all the windows just a note the power mirrors do work and i now have a code 69 fuel fail help please

 

S 91 engine management

hope this helps.

 

Invaluable! Thanks.

 

I may not be able to answer your questions but if you have followed my "Throwing in the Towel" thread, the people on this Forum are excellent and will put you in the right direction to get your car fixed. I went from selling the car and dumping it as/is to getting it 90% road ready.

I am sure you will get your XJ going in no time with the help of everyone here.