Does the DIC indicate the door is ajar?
Scan tool data will show a door ajar switch - I called it door latch switch
Driver Door Ajar Switch: The scan tool displays the state of the driver door. Active is open and inactive is closed.
Driver Door Handle: The scan toll displays the current state of the door handle switch. When the driver door handle is lifted the scan tool will display active and at rest will display inactive.
Driver Door Latch Lock Switch: The scan tool will display Yes if the driver door is locked and No if it is unlocked.
How to check wiring
Unplug three wire connector from latch.
With key on use a voltmeter and measure the voltages as follows
Place black meter lead in cavity for black wire
Place red lead in cavity with Gry/blk wire (door ajar signal wire) and record voltage
Move red voltmeter lead to LGrn/blk wire (door handle switch signal wire) record voltage
Both measurements should be similar and I believe these are 5 volt reference circuits. (slight possibility they are both higher)
If they are similar - problem in latch
If Gry/blk wire 0 (or real low) that wire is open and must be traced down
I do not know why - but GM shows the two different switches on two different diagrams: one is door ajar switches and the other is door ajar and indicators