Hello Everyone.
Apologies, new to this sort of thing!
1981 XJS HE RHD 6 cyl
Have suddenly lost horn, wipers, heater/air con
Checked fuses etc and circuits from fuse box out to components ok and wipers /horn etc all work if quickly put power to fuse 9, 11 but have no power getting to the ignition side of these fuses. For fuse 12 I suspect the ignition control relay but I could easily be wrong.
Please could anybody point me in the right direction or am I just being an idiot?
Many thanks

 

Welcome to the forum chipnping,

I've moved your question from General Tech Help to XJS forum. Members here with the same model will be able to help.

Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some info about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.

Graham

 

Welcome also from the colonies.

I am trying to get my head around your car.

1981 HE 6 cylinder????, has me straining somewhat.

Is it a typo, or did the UK get the 3.6 earlier than we did?. The HE was V12 designated.

My first best guess is the electrical section of the ignition switch is all gummed up and contributing to the issue. Quite common now due to age. Easily cleaned and sorted, although fiddly to remove, and tricky to seperate, but quite doable by any half competent human. When the switch is out of the car, place it in a plastic freezer bag BEFORE opening it up, that way the spring/pawl/*****, will only fly around the bag, and even a blind man could find them, the garage floor is a lost zone.

Once I know what your car really is, I will have a gander at the wiring diagrams I have and see what else could be upsetting the beast.

 

Not sure about 1981 model but all those fuses and only those are fed from the load relay on later cars.
Black relay on drivers side underdash assembly.

 

Many thanks for the replies, yes of course it is V12!! Do not know what happened there! Wrote and rewrote it and still got it wrong!
Have done ignition switch as suggested and no different! Also exchanged for a different one from scrapped car. Thanks for freezer bag tip, any more ideas?

 

Misery loves company. My car is a bit different, but close enough.


Grant has got it. Too bad for me that the issue was not raised earlier. A lot of issues hit in close proximity. No brake lights. No reliable crank, etc. Starter run on and crank effort with engine running!!!!


Really bad Ignition switch caused a lot of the issues. A good one, via David Boger fixed so much. Fiddly to remove the old and install the new, but, I got it done.
everything so much better.....


Caveat: Although some say service of the switch in situ is doable, I say maybe, but not by me. Too many little things. Even on the bench, pre Grant's counsel, I lost stuff. One, I didn't even realize existed!!!


All lost in my shop along with my missing 1/4 drive 5/16th socket....


Working little stuff over a pan as is my custom, not good enough here!!!!


Carl

 

Have you checked load relay as suggested. Would not be the first time one of these has gone bad.

 

Thanks to you both, will check load relay next but will be a few days before I can get back to the car. Car driving me mad with poor contacts in switches etc. Windows went down but then wold not return yesterday. Cleaned up contacts in switches and now good again. Will be a nice car once all sorted!!!
Sounds like your tools have legs like mine do Carl!

 

I used to work with a guy. a good mechanic. But, his mentor thought he should have two sets of tools. double the likelihood of finding what was needed.


I strive to have a designated space for each and every one., but, at times,....


In my recent travails, I thought I lost a pair of nice wire cutters. Lo and behold, they reappeared....


Carl.

 

thank you Baxtor, Jag Cad and Grant Francis
After buying a second New load relay everything now works!!!!!! means I can now drive it in the normal English weather. Although is warm dry and sunny at present, must make the most of it whilst it lasts.

 

I am having the same issue no horn/air conditioning/wipers. Is it this relay or the longer black relay or the round black relay? Thank you

 

Black square one between the white and the yellow on the assembly L/H side of car assuming your car is LHD.

 

The 'Pektron" units are usually timers, diode packs, buzzers, and 'logic units', not relays.

Relays on our old Jags will have terminal designations along the lines of 85-86-87-87A-30/51, 85-86-87-87-30....or similar.

Cheers
DD

 

The white block is where I pulled this PEKTRON from. So none of these pictured are relays? Where do I find the load relay that you were referring to baxtor?

 

My car is a 1985 so your early HE may be different. On my car there are two relays that affect this area, but I do not know exactly what they do! One is the main load relay, this is in the boot RHS front, just near the ECU. There are two normal looking relays here on a fixing clip, as well as a big flat thing also on the clip. The main load relay is the frontmost of the two normal looking ones (the rearmost is the fuel pump relay).

Under the dash there is a relay called the "ignition protection relay". I do not know exactly what this one does either. It is in the row of relays under the driver's side shin trim, above the fuse panel and counting from the left is the THIRD one on my car.
Greg

 

^^^ This is the load relay for fuel injection stuff



^^^ This is the one Highflyer is after.

It sends voltage to several fuses that branch out to some higher-load circuits: wipers, rear defog, and the like....thus taking the load off the ignition switch itself

Cheers
DD

 

Is this it? It's got all the numbers you mentioned earlier Doug. What's the best place to find a replacement for this? Is there an aftermarket other than Lucas?

 

That could be the one, yes. Jaguar often used that same relay in multiple locations.

You can use a generic 4-pin "Bosch style" or "Ice cube" type accessory relay...available almost anywhere. The terminal designations will be 30-85-86-87 (no "30")

If you get one that says 30-85-86-87-87a, that'll be OK as well. The "87a" terminal is simply unused in this particular case

Dorman Conduct-Tite! 84601 - Relay | O'Reilly Auto Parts

$5 - $10 in most auto parts stores


Cheers
DD

 

Yes that looks correct, plenty of aftermarket ones available and under £2 in UK! Mine has behaved ever since and been well used in English weather!

 

Is it necessary to disconnect the battery when removing and installing relays? Will pick up a new relay tomorrow and report back.