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I had exactly the same problem. The range of both my key fobs was 0.5m from the back window. I did check the key fobs, the antenna, the coax cable, the grounding on the roof, all connections… nothing worked.
I took out the security module and opened it. I inspected both print boards under a magnifying glass. There is a flat cable that connects both print boards. Were the cable connects to the small signal receiver board I discovered some damaged soldering. This was almost not visible to the naked eye. I had to take the print board out to be able to see this because it’s on the back side. I soldered the 3 points very careful and put it all together. (Please don’t try this if you’re not used to do soldering on a print board, ask someone who is) I think that the bad soldering has the same effect as a bad car battery. The flat cable has 3 wires. I presume + - and a signal to the main print. If the + or – are not nice connected, than the receiver print don’t gets the power it needs.
As the OP, I'm glad to see this reply. It makes sense, after doing electrical continuity checks on the antenna subsystem, I also suspected the RX amplifier board inside the SLM. I took the module apart, inspected the components and found nothing.
You were smart enough to check everything with a magnifying glass to find the dry joints - wish I'd done that...
Thanks LGfromBE.
I suggest a moderator mark this thread as resolved and make this a sticky - its a common problem
If your still having problem with your XK8 or XJ8 range or key fob not programming/working on the car then it is the Security Locking Module.
Berkshire Jag Components do a repair service on this module all you need to do is send your security module to them they will fix it and return within 1-2 working days.
much cheaper than buying a new one or having to try 101 things and still having no joy.
I’ve attached a link for you to check it out
My key fob was down to a couple of inches from the aerial at the top of the rear window.
Replaced fob batteries, checked main car battery - all OK.
Checked aerial connector to the security locking module (SLM) under the fuse box in the boot - seems clean and dry - no improvement after cleaning with contact cleaner and replacing.
Opened SLM and checked circuit board inside - no sign of water, burnt components broken tracks or corrosion.
Checked aerial connection at the top of the rear window. No obvious loose or corroded connection. Not keen on pulling and pushing too hard in case the wires break.
Thought it worth trying to replace the aerial in case the window aerial defective.
Plenty of cheap 433Mhz tuned aerials available from eBay but connectors mostly SMA male. SLM aerial connector is FME male. Original aerial lead is FME female.
Reasonably priced Female SMA to Female FME short connection lead available from RS components.
Fitted 433MHz aerial in the driver's side rear window. Range unfortunately still only a few inches but at least now don't have to lean over the rear window.
Looking to obtain a new key fob, so will update if the new key fob performs better.
Otherwise will have to consider sending the SLM off for repair.
Hope that may be of some use to others.
I've read the above thread with interest as my 2005 XKR has the same problem, in that there is no range when using the FOB. I took the boot apart with the idea of following 'DIBBETS' advice regarding potential problems with the Security Module (SM). My 'SM' is marked up as Part No LJE 2600BD, not what I was expecting (my info gives part Nos as LJB2600BB or BC.
Next I attempted to trace the antenna cable which was fine until I reach the top of the wheel arch where it was taped in with the wiring loom and then disappeared through the bulk head.
I am now left with the conclusion my antenna cable does not attach to the rear window???
Has anyone else come across this and can supply me with an answer as to where the cable ends up before I start removing the back seats/carpets etc
Mike
..... I am now left with the conclusion my antenna cable does not attach to the rear window???
Has anyone else come across this and can supply me with an answer as to where the cable ends up before I start removing the back seats/carpets etc
Welcome to the forums Mike,
If it's a Coupe, the cable terminates in a press stud connection to the antenna at the top of the rear screen:
Easily dislodged by zealous cleaners!
I have no idea where it terminates in a Convertible. The last time we had top down weather here was in 1978.
...I have no idea where it terminates in a Convertible....
There's one under the rear passenger side quarter casing cap (#2 on the diagram below) right above the passenger seatbelt shoulder mounting location. Take the cap off and there will be a single wire projecting out into the space below the cap.
If it's a Coupe, the cable terminates in a press stud connection to the antenna at the top of the rear screen:
Graham
Thanks for that info. I'll have another look tomorrow, if it's stopped raining. I just don't remember seeing anything around the rear window, top or bottom. Perhaps it is under the rear quarter casing cap as suggested by 'CRBASS'. I will let you know
regards
Mike
I gave you the Coupe location in post #26 - Dale gave you the Convertible location in post #27.
Graham
Graham,
Must be going blind in my old age, the antenna was, as you suggested, at the top of the back window. Just cleaned up the terminals but alas it's made no difference.
I think I will test the cable then take the Security Module out and look at it as the next step.
Just as an aside-whilst looking at the SM I have discovered what looks like a control Module laying in an empty slot inside the Fuse box (next to the battery). There are no markings on it and it's served by two clusters of wires, one through a 'Brown' terminal the other through a 'Black' terminal. The wires into the brown terminal are Orange, Red, Yellow, White, Black and Blue. Into the black terminal the wires are White, Green, Brown Green/Brown, Brown/Green and Black/Brown. Any idea what this is?
regards
Mike
.....whilst looking at the SM I have discovered what looks like a control Module laying in an empty slot inside the Fuse box (next to the battery). There are no markings on it and it's served by two clusters of wires, one through a 'Brown' terminal the other through a 'Black' terminal. The wires into the brown terminal are Orange, Red, Yellow, White, Black and Blue. Into the black terminal the wires are White, Green, Brown Green/Brown, Brown/Green and Black/Brown. Any idea what this is?
It's been a few year since I had an XK8 and I can't recall the precise details of the Fuse Box. I'm sure another member with and XK8 will be able to check this for you.
I think you've found the REAR PARKING SENSOR CONTROL MODULE ECU. I'm surprised there are no markings on it. Should be labelled something along the lines of 4X43-15K866-AD.
Oh!
Well the 'box' I've found definitely isn't situated on the LHR corner it's in a slot in the fuse box, sited behind the battery. Sorry I thought this query would be a simple one, I'm beginning to realise that Jaguar don't seem to do 'simple'. I'll check through the wiring diagrams for the wire combinations to see if I can identify it. Thanks (Brian and Graham) for your help
Merry Christmas, what's left of it
Mike B
My Parking sensor control module taken out of its slot alongside the luggage compartment fuse box. To be fair the foam insulation was covering virtually all of the identification codes when I found it.
Did you ever find the solution to this? The car I have recently bought has the remote issue as well. Previous owner had spend nearly a 1000 in 2014 getting it addressed with a new SLM module, but now 2022 the fob only works 1-3m away from the car.
Hi wot76,
Sadly not. I haven't swapped out the module yet or got it repaired.
But I am able to live with the temporary solution of moving the aerial to the driver's side rear window.
I'm still on the look out for a reasonably priced security module, so will update if I get the chance to try it.
There's one under the rear passenger side quarter casing cap (#2 on the diagram below) right above the passenger seatbelt shoulder mounting location. Take the cap off and there will be a single wire projecting out into the space below the cap.
Rear quarter casing, cap is #2.
What year(s) would that include? I had that off in my 2001 and the only wite was for the airbag sensor in the front of that cap.
02-04-2019, 04:21 AM
could be resolved?
Very Little range with FOB
Antenna on Back Window
