The rear driver's side door not working.
Power sliding doors are extremely complicated. There are motors, and switches, actuators, safety devices, and it's all controlled by a computer. Here are a couple of things to check. Check the fuses. Make sure the fuel filler door is closed. There is a pinch strip on the leading edge of the door. The door won't operate if it is damaged. Other than that, any other diagnostics require a scan tool, and a diagnostic flow chart to narrow down why it is not working. Have a qualified mechanic, such as one from YourMechanic, inspect your car's door issue.
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