All Things Mk5 > How to Guides / Troubleshooting

Alarm randomly going off? Can't turn off with my fob either.

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bad devotions:
I had a similar issue on an 03 plate A4. I had to take it to Audi and they put a new control unit in. Taking it to Audi was last resort though, three different garages tried various fixes before they nailed it.

edition30gaz:

--- Quote from: skard on January 20, 2015, 08:39:51 pm ---I've had a few alarm related problems over the years on my mk5's.

The main culprit is usually the internal battery of the alarm siren self combusting, so it needs a new siren.
Last time, it was a new battery needed and the alarm was going off due to dropped voltages.

It has also been known for ultrasonic sensors to cause issue.

In 46-CCM, if you look at measuring blocks, it will tell you the last few triggers for the alarm, this will point exactlky at what you need to replace.

--- End quote ---

Checked the measuring blocks earlier today and all the triggers were no. 12 - intelligent siren, is this the one behind the arch liner?

Slightly confused as to why the other two error codes came up as well?

skard:
If you go onto the Ross Tech wiki it'll give you symptoms and possible resolutions for the fault codes.
The other codes could be old ones, or more likely the siren battery has packed up and lost comms with them - hence the fault.

Intelligent siren is definitely a failed/failing siren, yes in the aluminium case under drivers wheel arch. Buying a used one may result in this happening again, but if buying one get a C or D version.

edition30gaz:
I'll have a look and see what Ross Tech comes up with, most probably buy a new replacement unit and hope that sorts it. When my friend cleared all three codes they just came back straight away, but fingers crossed we've narrowed it down now. Thanks very much for your help it's really appreciated!

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