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Home >> Subaru >> 2018 >> BRZ tS >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Engine Immobilizer System (W/ Entry Start) >> Engine Immobilizer System (With Entry & Start System) >> DTC B278D: ID Code Box Recognition Error >> Circuit description

Circuit description

When the collation ECM (smart key ECM ASSY) detects the input signal that indicates that the ID code box is installed on the vehicle even when ID code box is not registered, the collation ECM (smart key ECM ASSY) outputs this DTC.

Diagnostic codes Detecting conditions Faulty part Diagnostic code output check operation
B278D Even without installation of the wire harness that judges whether the ID code box is installed on the vehicle or not, the collation ECM (smart key ECM ASSY) receives the LIN signal from the ID code box. There are not the communication failure without ID code box. Always

*: Output only when a failure is noted.

VEHICLE STATUS AND FAILSAFE UPON FAILURE DETECTION

Vehicle status when a problem is detected Failsafe function when a problem is detected
Key registration is prohibited. -
DIAGNOSTIC CODE DESCRIPTION - DATA MONITOR AND ACTIVE TEST

Diagnostic codes [Data monitor]/[Active Test]
B278D -
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