Hi, this is a long shot, but I still own a MY02 WRX and I'm having exactly the same issues you had in 2010. My dash lights are not turning on, everything else is OK. I've checked fuses, relays, multi-switch, bulbs, etc., etc. I also had those same schematics you posted (I got them on PDF) and I CANNOT find anywhere the INTEGRATED MODULE. I've torn appart the whole dashboard, NO CLUES!!!
Did you find a solution?? Do you remember for a miracle??
Thanks and sorry to bother...
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