RC rear ventilation flap issue

I've got a weird issue with my 2018 Lexus RC Hybrid. The rear ventilation flap seems to be faulty. I'm getting an error stored, and the climate control unit is acting up. The air conditioning isn't cooling like it should, especially for rear passengers. Could this be related? I suspect it has something to do with the flap actuator.

4 comment(s)

Sounds like a classic rear HVAC issue. The ventilation flap controls airflow to the back. Since you mention an error code and cooling problems, a faulty cable or plug connection is definitely plausible. Have you checked the wiring harness and connectors for any obvious damage or corrosion? Sometimes a simple visual inspection can reveal the problem.

Thanks, that's helpful! Where exactly would I find the wiring harness and connectors for the rear ventilation flap actuator? Is it easily accessible, or do I need to remove interior panels to get to it?

You'll likely need to remove some of the rear interior panels to access the actuator and its wiring. I don't have the exact diagrams for your RC, but it's usually behind the rear seats or in the side panels. If you're not comfortable with that, I'd recommend taking it to a workshop. A damaged connector can sometimes mess up the CAN bus system.

Thanks for the advice! I checked as much as I could, but ended up taking it to the shop. Turns out, it was indeed a defective connector on the flap actuator. They replaced it, and the AC is working perfectly again. The total repair cost was 95€.

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