Vectra C Estate Life (2008) Alarm Issues

[Shoty32]

Car Alarm goes off approx 5-mins from being set – this only started yesterday.
I’ve looked over the forums and tried a few of the mentioned options.
Checked each window quarter panel for breaks – Yes one was “open-circuited”
I removed the two cables and shorted out the contacts – alarm still goes off after 5mins.

I then removed the second set of contacts (just in case) on the other window and shorted these out – the alarm still goes off.

Unsure if there are any contacts within the rear window – can someone advise were they are and how to get to these.

I’ve now removed fuses 21 & 23 – the alarm no longer sounds but I think this has disabled the alarm…..

I’ve no Tech2 equipment or alarms data on my dash (basis car only)

Can anyone shed any light on this.

Thanks

[Journeyman]

Do you have a tow bar? I had the same problem with my estate - when it was still under warranty - Vx electrician found cause was a short off the tow bar wiring connection into the loom.

[Shoty32]

Sorry No towbar or any other non-standard option.

[John Bishop]

Read somewhere that the rear demister on the estate acts as a sensor for the alarm just like the rear side windows. Would imagine you would need to take the trim off the tailgate to get to the connections.

[Shoty32]

I was thinking something similar - unsure how to take of all the trim without beaking it. Does anynow now are the cables located at the bottom of the window need the door lock.

[Journeyman]

You could eliminate it by pulling the heated rear window fuse off the rear fuse box.

[Shoty32]

didn't think of that - I'll give it a try
Thanks

[Shoty32]

no difference removing fuse 4. I've removed fuse 21 and put back fuse 23. I don't think the alarm will now operate - can anyone confirm.

[DTi Elite]

have you tried pressing the running man button to disable the ultrasonics when you lock the car ??
this is the easiest way of eliminating a fault within the sensors .

[Shoty32]

Yes, I done this first and the alarm still went off.