central locking/pwr window problems

[e30_kid89]

hey i just aquired an 4dr 91 lazurblau 318i shell in darn good shape...thing is when i bought the car the guy sold it to me had told me that he switched all 4 doors from his 88 iX over to my shell since its the same color...the doors were all working and ive even seen them work before he switched em over(both windows and locks)...any way now the central locking and pwr windows are dead. i checked fuses 17 and 27 and they're just fine.....the harness is clean and i spreaed a but of wd-40 just to clean the contacts a bit more.....i think the actuators are good cause i switched one of em over from the trunk into my e30 DD and it worked like it was brand new. i also switched the central locking unit for another one since i thought it could be dead. so where should i start looking to see where my problme is and how to fix it??

thanks for reading.

Devon.V

[e30_kid89]

also i checked for pwr @ the harness for the central locking and power is getting to it so where to go from here.... and is there some way i can jump the windows just to see em work???