Hi,
Do any of the other door locks work? If they are working properly, then I suspect there could be an issue at a splice for the left front door. Does the driver's door open with the second click of the fob?
I attached the wiring schematic below related to the door locks. It was 2 pages long, but I had to cut the schematics in half to make them readable for you. I did overlap them so you can follow from one to the next, and I highlighted the wiring for that lock motor.
Here is what I suggest, I need you to check for power going to the lock motor when you press the fob one time. Now, there will be a blue wire and a white wire at the motor. One will get power when you lock and the other when you unlock. Check both to see what is happening.
Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-wiring
Let me know what you find or have other questions.
Take care,
Joe
See pics below.
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Wednesday, August 25th, 2021 AT 7:16 PM