Thanks for the advices.
Tried all the fuse associated with instrument cluster (B1, B10, E1) with no luck.
The fuse are all fine, I even tried the spare fuse on them to make sure.
Does anyone know where to find the 2003 relay chart? I found the 2000 chart but the relay names do not have too much direct relation with the instrument cluster:
http://theschillings.com/boxrelay.htm
I will try to disassemble the dash in the weekend to see whether it could be connection issues.