service manual diagnostic flow

[Hgene]

I'm having a problem finding the common source for a problem effecting door locks, windows, dome lights, and power mirror.
I started this on another thread so there is more information there. On my 2001 Aurora the rear doors and passenger door power door locks, power windows, entry dome light and passenger power mirror do not work from the key fob or the door modules. The driver door module and the power door lock on the driver door works from key fob or door module controling the driver window, driver lock, and power mirror. From the driver door module none of the functions controlling other doors work.
So what I think I'm looking for is where is a common device or connection that effects the rear/passenger doorlocks, windows, entry dome and power mirror?
Does anyone have a service manual for this 2001 Aurora and does it give such detail?
Thanks
Gene