All Things Mk5 > How to Guides / Troubleshooting

Alarm diagnostics?

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mk4gti-t:
Ok so the last couple of nights my alarm has gone off at roughly the same time. Is there any way of seeing what it was that triggered it? Is it possible to interrogate the alarm via vcds? Cheers.

bacillus:
A normal scan should flag up if your siren is faulty.

mk4gti-t:
There's no errors on a full scan. I just wondered if there's any blocks etc... that can be looked at to see which sensor was triggered to activate the alarm.

skard:
Measuring blocks in CCM (46) can show you the previous triggers.

I've replaced a couple of sirens over the years as their internal battery has given up, but faulty interior sensors, damaged wires or main battery failing can also be the culprit.

MateyGuv:
I had unreal problems with my alarm last year and after a scan was indicated problem was rear lock so replaced that, then the vw logo handle and so on. Turned out to be the inner ignition barrel micro sensor switch. Do you hear a clicking every now and then while driving?

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