Tesla Auto Wipers: Why They Don't Work and Why There Isn't an Easy Fix

Original Article ↗ Hacker News Discussion ↗

Vision-Only Strategy and Motives

  • Tesla’s insistence on “Tesla Vision” (no dedicated rain, ultrasonic, or radar sensors) is seen as:
    • A cost-cutting move (saving a few dollars per car, multiplied by millions).
    • A dogmatic belief that vision alone can match or beat humans and eventually enable full self-driving.
  • Some argue leadership deliberately withholds simple hardware fixes to force teams to solve problems in software; others view this as stubbornness that ships half-working features.

Human Perception vs Cameras

  • Several comments stress that humans don’t drive on vision alone:
    • Other senses (touch, hearing, smell, proprioception) contribute to detecting issues, vehicle dynamics, and even rain.
    • Human eyes are coupled to a powerful brain and have features (dynamic range, variable focus, moving viewpoint) cameras lack.
  • Critics say using only video is like “handicapping” the system when complementary sensors could make it safer and more capable.

Traditional Rain Sensors vs Tesla’s Approach

  • Standard IR-based rain sensors are described as cheap, mature, and reliable, though not perfect and needing calibration with new windshields.
  • Multiple commenters are baffled Tesla replaced a well-understood, single-purpose sensor with complex image processing.

User Experience with Tesla Wipers & Controls

  • Many owners report Tesla auto-wipers:
    • Often fail to start in rain, run at wrong speeds, or trigger in dry conditions.
    • Lack the ability to “bias” auto mode faster/slower, forcing a choice between bad auto and fixed-speed manual.
  • Earlier UI required adjusting speed via touchscreen while driving; recent updates allow using steering-wheel scroll wheels, which some find acceptable, others still call unintuitive and unsafe for a critical function.

Comparisons to Other Cars’ Auto Wipers

  • Experiences with other brands vary:
    • Some describe near-perfect auto-wipers in older mainstream cars (Mazda, Mitsubishi, BMW, Subaru, VW).
    • Others dislike auto-wipers in general and prefer simple, well-designed manual intermittent controls.
  • Many note that in most non-Tesla cars, auto is just one position on a traditional stalk, preserving straightforward manual control.

Cost, Innovation, and “MVP” Culture

  • Several see this as “penny wise, pound foolish”: saving a few dollars in hardware while burning engineering time and frustrating customers.
  • Broader criticism of shipping “MVP” features into production cars and using customers as unpaid beta testers; some defend this as acceptable since buyers keep supporting it.

Safety and FSD Implications

  • Wipers are framed as a core safety system; putting them behind touchscreens or unreliable auto logic is seen as dangerous.
  • Some note that if FSD can’t robustly detect rain (as implied by poor wipers), it likely doesn’t adapt driving behavior adequately to wet conditions.

Aftermarket and Workarounds

  • Suggestions include third-party programmable buttons for wiper control and even tongue-in-cheek ideas like squirt guns aimed at cameras.
  • Some commenters would pay significant amounts for a reliable hardware add-on just to restore simple, direct wiper control.