S/X Refresh: Matrix LED headlights — pixel failures, flickering, repair vs replacement

Summary

Matrix LED headlights came to Tesla Refresh S/X from the 2021/2022 model year (first deliveries), later — on M3 Highland (from late 2023) and Y Juniper (from 2025). Each headlight contains dozens of small controllable pixels that are programmatically "dimmed" where an oncoming vehicle is. There are three types of problems: software bugs (flicker, strobe, segments going dark), hardware failures (driver chip burnout, full matrix failure) and lack of adaptive functions in the US until 2024 (the headlights are there but "inactive" due to NHTSA).

Symptoms

• Flicker / strobe of high beam on the highway (especially with FSD beta).
• Dark horizontal lines in the high-beam pattern — normal (those are pixels), but a "hole" in one zone is no longer normal.
• One segment / the entire matrix block simply doesn't light up.
• On the cluster — "Headlight system fault" or "Adaptive headlights unavailable".
• The car doesn't dim high beam for oncoming traffic (camera doesn't see / firmware glitches).
• On M3/Y Highland/Juniper — DRL failure (daytime running lights) after software updates (a known bug).

What to do

1. First — software

1. Check your software version. On Refresh S/X 2024.20+ and 2025.x — Tesla added fixes, but the flicker bug lived for over two years, and an expected "full" fix was announced in Feb 2026 (firmware analysis shows test rollout).
2. Do a soft reset (both scroll wheels on the steering wheel, 10 sec) — resets the lighting controllers.
3. Hard reset via brake pedal (40 sec after soft) — sometimes helps.
4. In Service Mode → Lighting → Headlight Control Module — check errors and module operating-time counters. If a CRC mismatch of headlight module firmware is visible — Tesla can reflash it separately.
5. Camera calibration (see the windshield article) — without proper calibration the matrix doesn't know where the oncoming traffic is.

2. Hardware failure

• A fully dead matrix block — usually dead pixel driver inside the headlight (not fixable without opening).
• Tesla doesn't sell a separate "module" headlight — officially only the headlight as an assembly.
• From teardowns (Copart, Lithuania, Poland) you can get a working headlight from a wrecked car — 2–3× cheaper, the risk being the "new or wrecked" status in the on-board computer.
• Opening the headlight (to access the LED module) is theoretically possible after warming in the oven (60–80°C, soften the sealant), but on Refresh headlights they're sealed with ultrasound + sealant — they won't close back hermetically.

3. AliExpress / Chinese "matrix replacement"

⚠️ Quality is a lottery. AliExpress has copies of Refresh S/X matrix headlights at $700–1100 each. Experience with other makes shows:

• After 6–12 months — LED degradation, dimming, pixel drop-outs.
• Internal fogging (poor sealing).
• Configuration in the car sometimes requires VIN matching — the headlight may not "register."
• Adaptive functions (cornering, selective dimming) often don't work or work intermittently.

Tip: if budget allows — OEM from teardown (Copart / EU dismantler). AliExpress is the last resort for a "leaving car."

Belarus budget

Parts:

• Software fix — free (OTA from Tesla).
• Used Refresh S/X headlight from EU teardown — $500–900 each.
• Used M3 Highland / Y Juniper headlight — $350–700.
• New dealer Tesla headlight S/X Refresh — $1,200–1,800 each.
• Aftermarket / AliExpress — $600–1,100 each (risky).

Labor (Minsk, ≈$50/h):

• Diagnosis + soft/hard reset + error analysis — $30–60.
• Headlight replacement (with adjustment) — $60–100 each.
• Recoding via Toolbox (if the headlight is from another VIN) — $50–100.
• Camera calibration after replacement — usually free (dynamic on the road).

Total: $0–2,200 (from firmware to replacing a pair of new dealer headlights).

DIY notes

• Before panicking → check your software version and wait for a couple of OTA updates. As of February 2026 Tesla is actively testing a flicker fix.
• In Service Mode there's a "Lights → Headlight self-test" — each segment blinks in turn. This shows which part of the matrix has died.
• Don't try to replace the LED chip inside the headlight — without specialized tools and an IR station this ends up as a discarded headlight.
• If installing a used headlight from another VIN — configuration via Toolbox 3 is mandatory, otherwise adaptive functions won't activate.
• On M3 / Y pre-Highland (without matrix) "retrofit" to matrix is possible, but you need: the headlights themselves, wiring, Tesla configuration. Done by a few specialists in Belarus via Toolbox.
• If matrix was "disabled" by NHTSA (US car) — in Belarus they can be activated via EU-region reflash (see the article on certificates/connectivity).

Community experience

From the TESLA owner's group BELARUS chat — analysis of 400,000 messages.

What owners say:

1. On pre-refresh M3 (US-region) matrix headlights aren't physically installed — those are regular ones. To get adaptive — a refresh or Highland is needed.
2. On M3 refresh from late 2023, updates like 2024.20 arrive, adding cornering light (headlight illuminates in the steering direction).
3. Artifacts on the glass with matrix — sometimes not a headlight problem, but a reflection in the new windshield (especially XYG). When replacing the glass, check on oncoming traffic.
4. After update 2024.8.7 on some cars an error "headlight software mismatch" popped up in Service Mode — fixed by the next update.
5. Mobile Connector / Wall Connector — don't confuse "matrix headlights aren't coming" with "Wall Connector isn't coming in the update" (often mistyped in chat).
6. Replacement of a headlight as an assembly on Refresh S/X — not a complex operation (fender liner + a couple of bolts), but the part cost bites.
7. After replacement — mandatory aim adjustment; the wheel knob doesn't work on Refresh, you need a stand + Toolbox for electrical height adjustment.

Who reported the issue: Sergey_s, Pasha n1claus, Dmitry K, Igor Dubinchik, Yauhen, Grin, Dzianis Balyka

Who found the fix: mouSe, Adrian, Alexey, Pasha n1claus, Jy

Discussion in Telegram: #18969, #36959, #52495, #52503, #52758, #54073, #54524, #57902, #121832, #316428

Links / Sources

• Tesla Matrix Headlights — Features, How to Spot, Retrofits (Not a Tesla App): https://www.notateslaapp.com/news/2059/tesla-matrix-headlights-features-how-to-spot-them-and-retrofits
• Tesla to Add Support for Matrix Headlights via OTA: https://www.notateslaapp.com/news/1902/tesla-to-add-support-for-matrix-headlights-for-existing-vehicles-in-upcoming-software-update
• Tesla Matrix Headlight Glitch Fix incoming (WebProNews / 2026): https://www.webpronews.com/teslas-matrix-headlight-glitch-may-finally-get-a-fix-and-owners-cant-wait/
• Tesla May Finally Fix Matrix Headlight Flaw (Carscoops, Feb 2026): https://www.carscoops.com/2026/02/tesla-matrix-headlights-update/
• Why is my high beam made of horizontal lines (TMC, pixel explanation): https://teslamotorsclub.com/tmc/threads/why-is-my-high-beam-made-of-horizontal-lines.338476/
• Tesla Recalls Model X for Flickering Lights — KBB: https://www.kbb.com/car-news/tesla-recalls-model-x-for-flickering-lights/