trying to check wiper motor relay.

[MIKe30]

not sure which subforum it belongs in, so this is a repost from the gen tech subforum, mods feel free to delete whichever doesnt belong if you want.

anyway, just picked up an 90 325is with no windshield wiping capabilities. when you flip the wiper stalk, nothing happens, no extra noises nothing. i want to check to see if it is my relay before trying to replace the motor (which i hear is a nice royal pita).

I've read the long rectangular relay on the passenger side is the one that controls the wipers, and i have another e30 to swap the relay from to check it - but it is a 91 318is, and the part number on the relay is different. bad idea to try and swap it or no? worst scenario if i try it is...?

thanks for the input.

-mike

edit:
part # for 318is - 1 386 978 stamped in white ink on side - 012 11SB
part # for 9032is - 1 374 613.2 stamped in white ink on side - 92011 SB
318is relay also has a brown circle on the bottom side. otherwise the rest of the relays match up (all pins labeled same numbers 53b, 53, 15, 31, etc etc)
if both relays control the same things on both cars, then they should be interchangable. at least thats my thought process... am i wrong on this? also the second thing is i'm not sure if they both control the exact same functions.
hope someone has some insight.

[droptop_325i]

i really wouldnt know anything about that but i have the same problem with my 90 325i when i flip the stalk it just makes a nosie like the motor is running but it will not move the wipers if yall have any suggestiones please pm me or reply or email me wlopez90@yahoo.com