bmw x5 causeing major headwork

hi just wondering if any body can help me with a problem ive got with the x5 ive got!the problem is os front heated seat inop,no power on the control panel switch for os but all working on ns checked wires fuses etc now come to a halt would be grate full for your help thanks mark p.s are the nsr lamp common for corroding on the bulbholder circuit board thanks:banghead: