DTC B2A07 Backup Battery Charge System Performance: Trouble symptom

• ACN/SOS function cannot be used when the main battery is disconnected.
• RED LED illuminates.

CAUTION: CommCheck is required after replacing the DCM. Ref. to ENTERTAINMENT>Telematics System>OPERATION>REGISTRATION (COMM CHECK) .

Fig 1: Backup Battery Charge System Performance Diagnostics Flowchart

Courtesy of SUBARU OF AMERICA, INC.