DTC B1100 INTEG. Unit System Error: Trouble symptom

WARNING: This page is about a different car, the 2008 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

Check light comes on in the combination meter.
LAN communication immobilizer function may not be executed normally.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK DTC. Check the DTC displayed in the body integrated unit.	Is the DTC B1100 displayed currently malfunctioning?	Go to step 2.	Temporary EEPROM access error occurred.
2 CHECK CONNECTOR. Turn the ignition switch to OFF. Disconnect the body integrated unit connector. Connect the disconnected connectors. Read the DTC of body integrated unit using Subaru Select Monitor.	Is the DTC B1100 displayed currently malfunctioning?	Replace the body integrated unit. <Ref. to BODY INTEGRATED UNIT . >	Temporary EEPROM access error occurred.