TechnicianVision · Knowledge base
Calibration Research Tips: Toyota/Lexus Vehicle Control History Codes
I-CAR · November 12, 2024 · Toyota, Lexus
Summary
This article explains that Toyota and Lexus vehicles may display ADAS error messages on the dashboard without triggering standard Diagnostic Trouble Codes (DTCs). Instead, these events are recorded as Vehicle Control History codes (also known as Record of Behavior or RoB codes, typically starting with 'X'), which require specific diagnostic steps to view and clear.
What to do on the job
When diagnosing ADAS dashboard errors on Toyota/Lexus vehicles that show no standard DTCs, access the 'Vehicle Control History' (Record of Behavior) section in TechStream to identify and address 'X' codes.
How to use it
Use this document to justify the additional labor and diagnostic time required to access, analyze, and clear Record of Behavior (RoB) codes using an OEM-compatible scan tool. It proves that a standard pre- or post-repair scan may not detect or clear these hidden 'X' codes, which can keep ADAS systems disabled even after physical repairs are complete.
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