I have a 2008 Saturn Aura.
I've recently run into an issue with my locking system. When the weather gets warmer, 3 out of 4 of my locks stop working. Sometimes it's all 4 locks that have the issue, depending on how hot it is. The locks toggle a bit like they're trying to move, but they don't actually get to the position they need to. Furthermore, this issue is only occurring when I try to use my key fob and the lock/unlock button on the inside face of the door panel. This issue occurs when the engine is idling and when the engine is completely off. The locks work perfectly fine if I put the car into drive or park and they automatically lock and unlock respectively.
What is the most probable cause for my locks having the issue in warm weather and not cold? Why are my locks working if I put the car in and out of drive but not when I try to manually lock and unlock the doors?