CITROEN XSARA Technical Training Manual page 206

2 - Arming
The LED flashes during the volumetric protection timer at a frequency of
25 Hz, then at a frequency of 1 Hz until it is disarmed. If volumetric
protection is cancelled, the LED flashes immediately at a frequency of 1
Hz until it is activated.
a - Triggering
To view the reason why the alarm was last triggered, the vehicle must
be locked and then unlocked quickly. The LED flashes in accordance
with the table below:
MULTIPLEXED BSI - XSARA PICASSO AND XSARA – PART 9
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REASON FOR TRIGGERING
Volumetric
Opening of doors
Opening of boot
Opening of bonnet
Attempt to start engine
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NUMBER OF FLASHES
Chapter 3
2
3
5
6
7