alarm system problem - help!

[soulman63]

Hi all

Since changing my battery on my Jaguar XK8 Coupe (1998 model) I have an annoying issue with locking the car.

Both remote fobs seem to be coded to the car system in that I can pop open the trunk/boot with the remote fob and also turn on the lights. However neither fob will lock the car. When I lock the car manually with the key the alarm goes off! Most annoying!

I've tried using the YouTube process of the "five full beam flashes" but to no avail as I don't get the learning mode chirp.

I've consulted a local car lock/key specialist and he's at a loss.

I'm selling the car soon so need to get this resolved.

Any ideas from the Jaguar Brain Trust?



Soulman

[eybic]

Are you sure the battery is the right one for the car? Battery issues (incorrect battery being one of them) can cause a lot of strange goings on.

Does your car need the battery to be "coded" to the car? A lot of modern stuff does, not sure if yours is included in that???

[Jaguar steve]

Lights and boot opening but lock/unlock buttons not working is normally a suggestion the fob is programmed still but two most used buttons have become contaminated inside and aren't making a good contact. The fact you don't get a beep when programming may also be for the same reason.

Suggest you strip the fobs and clean all the contact pads on the pcb as well the back of all the buttons, then fit new batteries. If you don't press any of the buttons whilst the batteries are out you should retain the programme but if not go through the sequence again.

On the similar XJ locking the door physically with a key locks the car but doesn't arm the interior movement sensors. There may be a secondary issue there as well but best thing to do is get the fobs working correctly first to see what happens

[soulman63]

thanks all, will clean up the contacts first, if no joy may have to take to Jaguar and sell a kidney to pay for their expertise!

[P700DEE]

That you can't lock the car with the key without the alarm going off says to me that the fault lies with the door locks not the fobs. Changing the car battery does not affect the fobs. Try a hard re-set by disconnecting the battery. If you need to visit an expert why go main dealer when independents are nuch cheaper?

[soulman63]

so, cleaned all the contacts and have successfully paired both fobs with the car. However on locking with remote get same problem as manual lock, so sounds like the battery reset is the way forward! Will try that this week!

Thanks for all responses so far

JIM

[x type]

Don't know if your car is similar to the X type

check the ignition barrel , when you insert the key it opens the little flap cover at the same time on the ignition barrel

if the flap stays open after removing the key the car thinks the keys are still in and doesn't want to lock the car etc.

small bit of wd40 on the flappy bit and the key in and out a few times sorts it normally