📖 The Quick Answer
TSS bundles Pre-Collision System (PCS) with Pedestrian/Cyclist Detection (AEB and FCW), Lane Departure Alert (LDW) and Lane Tracing Assist (LKA + lane centering), Dynamic Radar Cruise Control (full-speed-range ACC), Road Sign Assist (TSR), and Automatic High Beams.
⚙ How It Works (Sensors and Algorithm)
Hardware is a single millimeter-wave radar in the grille plus a monocular camera on the windshield. The ADAS computer fuses both inputs and controls throttle, brake, and electric power steering. TSS 3.0 (2022+) added higher-resolution sensors and better night-pedestrian recognition. TSS 2.5 was the 2020 to 2022 generation.
🛡 What It Protects Against
Rear-end and pedestrian crashes, lane departures, and highway fatigue. Toyota and Lexus consistently win IIHS Top Safety Pick awards with TSS.
⚠ Limitations and When It Fails
TSS 2.0 (2018 to 2019) had several TSBs for false PCS activation on overhead signs and false steering on grooved pavement, mostly fixed by 2020. After any windshield replacement the forward camera must be recalibrated using Toyota Techstream or an equivalent scan tool.
🚗 Which Vehicles Have It
Standard on every 2020+ Toyota (Camry, Corolla, RAV4, Highlander, Tacoma, Tundra, Sienna, Prius, 4Runner, Sequoia, GR86, Crown, Grand Highlander). Lexus models use Lexus Safety System+ 3.0 with the same hardware.
🔧 Related TSBs and Recalls
TSB T-SB-0151-19 covered TSS 2.0 PCS false brake activations and was resolved by software update. TSB T-SB-0117-22 covers Lane Trace Assist pulling left or right after windshield replacement.