B1780 on 2022-2024 Lexus LX — Theft Lock / Anti-Theft System Enabled (manufacturer-specific)
1 vehicles · 1 makes
How to diagnose and fix B1780: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Lexus LX · 2022–2024
Multiple 2022-2024 Lexus LX owners reported persistent SRS/airbag warning messages and dealer diagnoses related to the front passenger occupant classification system and related airbag components. These model years are covered by NHTSA recall 26V180 (Lexus 26LA03/26LB03): on LX models built July 30, 2021 through July 18, 2024, the front passenger seat may have insufficient clearance between the seat frame and a stopper, which can make the Occupant Classification System sensor misdetect the occupant, so the passenger airbag may not deploy correctly in a crash. Because the issue directly affects restraint-system operation, it is considered high severity even when the repair itself is covered by recall or warranty.
Common Symptoms
- SRS warning light illuminated
- Airbag system malfunction message
- Passenger airbag OFF/ON status behaving abnormally
- Warning appears after moving front passenger seat
- Repeated dealer visits for airbag-related faults
How to Fix
Scan the SRS system with a Toyota/Lexus-capable diagnostic tool and check recall 26V180 (Lexus 26LA03) status by VIN. Under the recall, dealers inspect the front passenger seat and replace the seat frame assembly as necessary at no charge, then clear codes and verify the occupant detection status with a seat calibration procedure. If the warning returns, wiring under the seat and connector tension should be checked carefully.
Sources for this issue (2)
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B1780 code reference
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Frequently asked questions
What does B1780 mean?
B1780 stands for "Theft Lock / Anti-Theft System Enabled (manufacturer-specific)." B1780 is a manufacturer-specific body code. On General Motors vehicles it is listed as Theftlock Enabled: the radio has locked itself because the VIN it receives over the data bus does not match the VIN stored in its memory, so the radio will not work until it is programmed or replaced. It is a radio anti-theft state, not an engine immobilizer or mechanical fault. Other makers use B1780 for unrelated circuits, so confirm the exact definition for the specific vehicle.
What are the most common causes of B1780?
The most common causes of B1780 are: Radio moved from another vehicle (stored VIN does not match), Radio not programmed after replacement or battery disconnect, Loss of the VIN message on the data communication circuit, Faulty radio/infotainment module. The specific cause varies by vehicle.
How much does it cost to fix B1780?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by B1780?
Au7o has documented B1780 across 1 vehicle models from 1 manufacturers: Lexus.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.