Quote:
Originally Posted by Qsilver7
Do the rear door locks respond when using the key manually in the driver's door lock? Or does the problem only occur when using remote unlocking?
As Ihord mentioned already...the rear door locks are controlled by the GM whereas the front door lock actuators are controlled by each door's control module (SZFT/SZBT).
Help us help you better by creating a signature that includes your model/model year/build date. Or remember to include this information because there are lots of changes during the production run from 1999-2006. 
I can't tell from the avatar if you are LHD/RHD (left hand drive/right hand drive)...pre-face lift or face lift...and the rear tail gate actuators changed as well as the location of some of the relays the GM sends data to for the tail gate. But poodinboo's suggestion to check the wiring harness is a good start...but again...the SCA (soft close actuation) feature of the facelift models rear tail gate...created a slight difference in operation.
Again, I'm not sure how accurate the diagram below is because we don't know what your model year/build date is...but you can see how the doors/tailgate/GM III are connected/controlled...and the diagram also gives the build date as to the accuracy of the diagram regarding the tail gate components (which is an example as to why listing your model/model year/build date is important in how specific & accurate the replies/suggestions/recommendations you get from forum members):
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@ J.Seven
I know this is an old post but I have the same problem now with a door actuator/lock not working (2003 E53 RHD...UK) nearside front the other 3 doors work as they should,
I tried another NSF actuator/lock and still nothing, I then tried the original NSF actuator/lock in the rear near side door actuator/lock plug and it works
What is SZFT and where would I find it on the E53? (uk passengers side)
is it something that I could fit/fix myself? (novice but will try)
Any info is really appreciated
Thanks very much
05-02-2018, 11:14 AM
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