Hi,
I went through all the schematics to determine if there was anything that tied them together. They have different power supplies, different grounds, but there is one thing that ties them all together, the body control module (BCM). I feel somewhat confident that is what has failed.
Here are directions for replacing it. However, you will need to program it to the vehicle.
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2014 Chevrolet Malibu L4-2.5L
Body Control Module Replacement
Vehicle Powertrain Management Relays and Modules - Powertrain Management Relays and Modules - Computers and Control Systems Body Control Module Service and Repair Removal and Replacement Body Control Module Replacement
BODY CONTROL MODULE REPLACEMENT
Document ID: 2572238
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I hope this helps. Let me know if you have other questions.
Take care and God Bless,
Joe
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Wednesday, March 10th, 2021 AT 5:41 PM