Buick Repair Questions? Ask a Mechanic for Answers ASAP
My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
In your rear fuse panel locate the fuse labeled RDM which is a 10 amp fuse.If this fuse is blown this will cause this issue here and this fuse will need replaced.If found blown replace this fuse and see if this resolves the issue here.If the fuse shorts out again this indicates there is either a short in the wiring leading from the fuse to the rear door control module or a short in the wiring leading from the rear door control module to the locks or a lock itself is shorting out needing replaced.I would then disconnect each rear lock one at a time to see if the short goes away when one lock is disconnected.If the short goes away when one lock is disconnected then this is the lock needing replaced.If the short continues then the rear door module needs disconnected.If the short goes away with this module disconnected then this module needs replaced.If the short continues then the short is in the wiring and the wiring will need traced to locate and repair the fault here.
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O.k.,this sounds like a possible fault with the RDM (rear door module) as this controls the rear door locks.This module can fail internally causing this fault here as I have seen several times before with it needing replaced to correct this issue.I would have the signals tested from the RDM with a multi meter to see if for sure this is the cause here and then if found at fault it will need replaced.If you need info on how to test this and you do have a multi meter to do this testing let me know.