hi new on this sight , 60 year volvo owner, but my 97/98 v90 has me beat , i had been repairing the vacum sources for the a/c during which i was laying across the passengers seat and every so often i would press the power seat buttons and the seat would move , finished the a/c system all panels back on , wife comes out and says you ve moved my seat ok no problem , well that was the start of the problem , no seat function s at all, so i now have been working on this for 3 days and im no closer , i have power the the main switch panel but no further , the only wiring diagram i have is for 740/760/940/960 , now as far as i can see the motor polarity is changed to reverse the motors , i can isolate the motors and the drives , switches everything works, but there is a little black box , which could be a relay ?and diode pack ?,but it appers that this where my voltage dissappears , has anyone been through this ,if so please help im close to being hairless