2003 GMC Crew Cab Door Lock Schematics

[03WIDEMAX]

Hello,
Its been awhile since I posted. I recently bought my Duramax back from the guy I sold it to in 2009 and I could not be happier! It only has one issue that I need to fix. Both rear door locks do not operate with the switch or the FOB. The previous owner claims they stopped working at the same time so its unlikely the solenoids failed at the same time. I know there is a relay that operates all four so that could be the problem. How can I find the schematic for this circuit?

 

[btfarm]

IDK about the schematic Jim but I think there is a separate circuit for each pair of doors. Checked all fuses?

 

[03WIDEMAX]

Checked all the fuses. Next I'm going to pull the door panels and see if the lock motor is getting power when the lock button is pressed. Found schematics at GMupfitter.com