DTC B1577 IMM Control Module EEPROM: DTC detecting condition

• Body integrated unit malfunctioning
• Failed to access ROM inside the body integrated unit.
  CAUTION: When the body integrated unit is replaced, registration of the immobilizer system is required. For details, refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.

Fig 1: IMM Control Module EEPROM Inspection Flowchart

Courtesy of SUBARU OF AMERICA, INC.