When you press the button on the passenger side does it lock the passenger door? Is it only the driver side button and key fob that doesn't unlock the front doors?
I suspect we have an issue with what is called the PCI bus. basically this is the network that allows the different modules to send commands to each other.
So when you press the driver side button to lock the doors, that sends a message to the passenger switch/module to unlock/lock that door.
this could be a wiring issue or a door module issue. Let's start with checking voltage coming out of the driver door switch on the wire for unlock and lock.
There should be 12 volts there. Here is a guide that will help with this:
If this checks out then we can go from there which is most likely a door module issue but let's take it one step at a time.
Let me know if you have questions Thanks
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Monday, February 15th, 2021 AT 5:15 PM