DTC B1571 Reference Code Incompatibility

DTC detecting condition: 

Reference code incompatibility between body integrated unit and ECM

1. CONFIRM NUMBER OF REGISTERED IMMOBILIZER KEY  .

   Confirm the number of registered immobilizer key. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume. Contact an Authorized Subaru Dealership.

   Is the number of registration 0?

   Yes: Go to  2

   No: Go to  3

2. PERFORM IMMOBILIZER SYSTEM REGISTRATION  .

   Register the immobilizer system. 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  4

3. 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  4

4. CHECK FOR ANY OTHER DTC ON DISPLAY  .
   1. Perform the Clear Memory Mode. Ref. to IMMOBILIZER (DIAGNOSTICS)>Clear Memory Mode 
   2. Read the DTC of the ECM. Ref. to IMMOBILIZER (DIAGNOSTICS)>Read Diagnostic Trouble Code (DTC) 

   Are DTCs other than DTC B1571 displayed?

   Yes: Perform the diagnosis of DTCs other than B1571.

   No: Go to  5

5. PERFORM ECM REGISTRATION  .
   1. Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (STI)>Engine Control Module (ECM) . Ref. to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>Engine Control Module (ECM)
   2. 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: Replace the body integrated unit. Ref. to SECURITY AND LOCKS>Body Integrated Unit