2001 Silhouette how to find and install powerdoor lock module

Since my previous post I have found out that it is in fact the door lock module causing all of my electric issues.
I was wondering if anyone can tell me how to find and install the door lock module. Since the part is $240 I would rather replace it myself if at all possible.
Thanks for any help you can give.

try this site and see if they can tell you where it is installer.com from what i can find some are in the driver's door . if it is the bcm it is in behind the headlight switch. but they sell and install them. if you want to call installer's the landline is1-713-626-7628.goodluck