Jag S-Type -intermitent fault where the remote fob does not work

I presume if you tried to start the vehicle it would start and drive as normal, just with the alarm going off... If this is the case then depending on make/model etc. the problem is electrical in the alarm system. The alarm is activated by the button, but not with the key in the door. Get the button to work and the alarm will de-activate. This maybe simple, i.e.. 1st checks...battery in fob , or bad connection in fob. Car Battery voltage.. is it 12v.

2nd check faulty receiver/ bad connection somewhere in system. To check correctly you will need to know locations of alarm/remote locking components. Basically find and test fuses (probably won't be faulty with your symptoms but check nevertheless,) then find receiver, and visual check connections in circuit, (bad earths are the most common failing in remote locking). If not working by this point you may want to stop and seek help.

Otherwise you will need a wiring diagram and have some basic voltage drop testing skills to identify problem. Thus you will need to test switching circuit in the remote locking/alarm circuit. Positive side...is the voltage is .5v or more then wiring fault on this side ...negative side test the same way.. Even with wiring problems, receiver may also be faulty as it would probably still work with volt drop of up to about 2v total, . If total volt drop in under 1v then somewhere in the receiver (the switch) there is a problem. If you are on here asking, you probably won't be able to find problem in receiver and that is where you would need an expert.

Seperate key fobs only can be programmed in the following way.

Turn ignition on/off 8 x times (allow all functions to stabilise) after the 9th on - press a button on both remote fobs. then turn ign. off. use good remote to lock and then try new remote to unlock/lock. sometimes it works first time - sometimes you have to repeat actions. good luck.

• You can't access the alarm without a programmed FOB. The FOB sends a series of frequencies for each command to the brain and must be sent from an FOB to activate the alarm. As much as I understand your frustration, if the alarm could be set without an FOB then the alarm could also be de-activated without it as well. This would not be much in the way of security. Good luck to you.

• Hope this helps.

Hie kshep05,i'm having the same problem on my x type which i bought last week. it just started doing that yesterday and i am @ my wits end. Have you had a solution or diagnosis for your problem?

Is the car alarming when opened on the fob? If so you have a control module fault. Try opening the car with the key. as soon as you unlock the door, open it and insert the key in the ignition - this should bypass the remote control. If you still have problems with this method - you will have to take it for repair/replace.

hope this helps. good luck

Not a solution just another problem...Lost my car fob key, have a replacement key no circuit. As I open door, sets off immobiliser like above for20 mins. I had someone look under the glove compartment but that got me no joy. How can I (non techy) resolve this so I can drive my baby home...Vreg Avensis1.8 model?
many thanks

this happened to my jag and i still havent managed to cure it ,its a computer fault i know but it will no doubt cost more to buy a new computer than the car is worth and it happened at the same time as one of the blower fans packed up,i rewired both in the end but the alarm still doesnt work or make the chirpy bleep that indicates that it has locked and set the alarm.

If im not mistaken,your car should have an alarm reset/override.Below the steering column,on the dash should be a slot where you put your remote transmitter to deactivate the alarm.If that works,you then need to have your remote checked and coded by a vw dealer.Good luck.

It is probably the remote. If you need to, to de-activate the alarm get in the car with all doors shut and turn the key to the on position and leave it for a couple of minutes, then the car will start. I haven't ever had to replace the etacs module for that complaint.

Seperate key fobs only can be programmed in the following way.

Turn ignition on/off 8 x times (allow all functions to stabilise) after the 9th on - press a button on both remote fobs. then turn ign. off. use good remote to lock and then try new remote to unlock/lock. sometimes it works first time - sometimes you have to repeat actions. good luck.