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Alarm Going Off

Alarm Going Off Brands: VW, Audi, Skoda, Seat

The customer’s complaint is that even though the vehicle locked, the alarm keeps going off.

Causes

Failure in various systems can cause this problem. The problem needs to be approached systematically and each of the potential causes evaluated until the actual cause is found.

Repairs

Connect your AssistPlus device and communicate to the Convenience Control Unit (46). [Note that newer models do not have this, so for newer models communicate to the Electronic Central Electronics (09).]
Go into Dynamic requests >> Measuring Groups. There are normally 16-20 groups in the Convenience Control Unit or 20-23 in Electronic Central Electronics.
You are looking for the alarm source/triggers. In this live data, it will give you a number for the last 4 alarm triggers. That number is then related to a circuit that has caused the alarm to be triggered. If there are different triggers over the last 4, then set the alarm off using different means so that you know the last one is a manual trigger.
Lock and leave the car and then recheck the numbers when it next goes off. You should now know what to look for as it will be the most recent trigger.
 
Here are some examples of what the numbers relate to:

2004 - 2012 A3, Gold, Leon, Octavia
MVB 20 in Convenience Control Unit

  • 0 = Driver's Door
  • 1 = Front Passenger Door
  • 2 = Rear Left Door
  • 3 = Rear Right Door
  • 4 = Tailgate
  • 5 = Bonnet
  • 6 = Tailgate Latch
  • 7 = Trailer
  • 8 = Rear Window Breakage
  • 9 = Ignition
  • 10 = Interior Monitor
  • 11 = Tilt Sensor
  • 12 = Intelligent Siren (if wiring connections are OK, suspect internal battery flat and requiring replacement)
  • 13 = Onboard Power Supply Control Unit
  • 14 = Driver's Door Control Unit
  • 15 = Front Passenger Door Control Unit
  • 16 = Rear Left Door Control Unit
  • 17 = Rear Right Door Control Unit
  • 18 = Gateway Control Unit
  • 19 = POR Alarm (Power on Reset Alarm)
  • 255 = No alarm source known

2007 - 2011 Q7
MVB 16 in Convenience Control Unit

  • 0 = Driver's Door
  • 1 = Front Passenger Door
  • 2 = Rear Left Door
  • 3 = Rear Right Door
  • 4 = Bonnet Contact
  • 5 = Tailgate Contact
  • 6 = Rear Window Breakage
  • 7 = Interior Monitor
  • 8 = Non Authorised Key
  • 9 = Intelligent Alarm (if wiring connections are OK, suspect internal battery flat and requiring replacement)
  • 10 = Tilt Sensor
  • 11 = Driver's Door Control Unit
  • 12 = Front Passenger Door Control Unit
  • 13 = Rear Left Door Control Unit
  • 14 = Rear Right Door Control Unit
  • 15 = Terminal 15
  • 255 = No known alarm source

These trigger numbers can vary between vehicles for different sources as you can see. There may well already be a description in the live data or an arrow next to the number to see what the arrow relates to. Once you have identified the circuit that the trigger is coming from, you can then focus on that circuit to diagnose the cause.