Code Definition

B2775 — Interior Verification Signal (to Theft Deterrent ECU / Smart Key ECU)

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Lexus

About B2775

B2775 is a generic (obd-ii standard) body diagnostic trouble code recorded for Lexus vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

Because B2775 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Smart Key ECU (Certification ECU) and Theft Deterrent ECU exchange an interior verification signal to confirm that a valid electronic key is present inside the vehicle during immobiliser release and smart start authorisation. DTC B2775 is set when the receiving ECU detects that the interior verification signal is missing, invalid, or not matching expected logic within a specified time after an authentication request. This indicates a communication or signal integrity fault preventing proper confirmation of key presence inside the cabin.

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