Alarm issue

[cococola]

My alarm was going off randomly on my 2000 F,once or twice a day with no reason. I locked the door with my key and the alarm didnt go off in 2 days,however I now find my central locking doesnt work on the key or the button remote.
Any ideas please?

[Rob Bell]

If you have a pscan, you can get into whether all the micro switches are functioning correctly.

Random alarms are generally stray microwave energy or a wiring fault. Wiring faults are typically with the boot loom (cable insulation cracks after years of flexing as you open the boot) but issue here points to an issue with drivers door lock or cabling?

[cococola]

Thanks Rob I will borrow a pscan and test.

[Roverlike]

Do not forget that alarm can be triggered if car battery goes low on voltage too ...

[cococola]

yes I put a new battery on previously thinking I may have a problem with the battery.

[Geoff.F]

Is the car a Japanese Re-import as They have a different Fob Frequency which I recollect can pick up interference. ??
Geoff.F

[cococola]

Im not sure Geoff but the fob is the old squarish shape if that helps?

[ArntyR]

cococola, sounds like you have a Lucas fob - which can have 2 frequencies.

This article is very relevant and shows how you can identify yours by looking at your ecu outer casing label. (It's a bit more difficult looking inside the fob, it seems...) It's penned by our very own Rob Bell

http://mgf.ultimatemg.com/group2/DIY/se ... /index.htm

Hope this helps

[Roverlike]

In order to identify on which frequency your fob works, you need to open fob and look for the resonator element on the pcb. In case of 3TXA, 3TXB and 3TXC fobs resonator is round one on the same side where the battery is. In case of 3TXD and 17TN fobs resonator is square on on the opposite side of the battery.
If you have round resonator with numbering 1239 then frequency is 315 MHZ. If you have round resonator with numbering 1207 or square resonator with numbering 2701 frequency is 433 MHz. Sorry, but atm I do not know what is the numbering on square resonator for 315 MHz, but if you have numbering which is not the one I mentioned, upload the picture of numbering on the resonator and we will see what is the frequency.

[Roverlike]

My alarm was going off randomly on my 2000 F,once or twice a day with no reason. I locked the door with my key and the alarm didnt go off in 2 days,however I now find my central locking doesnt work on the key or the button remote.
Any ideas please?

If your central locking is not working that might be because of burnt track on alarm box PCB. If this is the case, alarm box need to be opened and inspected and in some cases it can be repaired.

First thing I would look for is broken or bare wires below boot hinges. That could trigger your alarm, but also could lead into problems with your alarm box.

Have you managed to borrow pscan and look into potential errors?

[cococola]

I will do all of the checks this weekend with broken wires but so far I havent been able to source a Pscan although with my car as a keeper i ought to have one.