Trouble Judgment

WARNING: This page is about a different car, the 2012 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

The theft-alarm siren communicates with the ETACS-ECU by the LIN via the LIN cutoff control unit. The diagnostic trouble code No. B120A is set if the communication data between the ETACS-ECU and theft-alarm siren has an error when the relay inside the LIN cutoff control unit is ON (alarm is not activated.)