I've got problems with my wipers and my door locks on my 2005 325ci. I know that these are controled by the GM5 unit. But the only information I can find talks about the relays being at fault. But I find it hard to believe that 4 relays on the pcb would be faulty. I would think it would be something common to the unit. I've got an electronics background so changing any components wouldn't be a problem. Does any one have a schematic for the board or a wiring diagram for the car so I can fault find easier.