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. Contact an Authorized Subaru Dealership.

PERFORM ECM REGISTRATION .
Perform ECM registration. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume. Contact an Authorized Subaru Dealership.

Is registration complete?

Yes: Finish the diagnosis.

No: Go to 2
PERFORM ECM REGISTRATION .
Perform the Clear Memory Mode. (ECM and body integrated unit) Ref. to IMMOBILIZER (DIAGNOSTICS)>Clear Memory Mode

Perform ECM registration. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume. Contact an Authorized Subaru Dealership.

Is registration complete?

Yes: Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

No: Refer to "Correspondence table when registration is not possible" in the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume, contact an Authorized Subaru Dealership. If the registration still does not work properly, replace the body integrated unit. Ref. to SECURITY AND LOCKS>Body Integrated Unit