OMG... $400... Wow
By chance have you check those relays yet? In looking at the way the system is set up there is a chance that the Drivers door lock Isolation relay may be bad..
I always say if I was near you we would have swaped in a relay, and if that didn't do it, we would have swpaed in a Module to see if that corrected the problem..
Hope you get it solved...
If you do go to the yard and they ask what the box is, just say I was told I needed the illumination Module with 3 connectors...
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