Citroen xsara Picasso dashboard light bulb is the bulb that's for the dashboard light climate control. The you tube web site gives you information as how to change the bulb.
T5 0.6w although 1.2w give a brighter light
the light tells you that you have passed its service interval
NO
It's under the n/s front light.
Take the gearbox out and flip it round twice
The alternator needs attention or replace
if is xsara picasso then: from inside move carpet on the left side, there you see two metal parts which need to be squeeze and all rear light come off. Then you take off plastic where are all bulbs in, brake, direction and reverse bulb
Bad light bulbs.... Replace them...
ABS Brakes need servicing.
you have to remove the cover of the dashboard to replace the light bulbs
Check fuses and light bulbs
remove dashboard and replace 2 bulbs behind it