April 5, 2026: LEMON Manuals is launched! Read the announcement.

For C0 And C5 Models

DTC detecting condition:

ID code box malfunction
When inaccessible to ROM in ID code box.

Trouble symptom:

Engine will not start.

CAUTION:

For replacement procedure of ID code box, refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.
Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>General Description>CAUTION .

CHECK DTC .
1. Turn the ignition switch to ON.
2. Using the Subaru Select Monitor, perform the clear memory for «Engine». Ref. to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>Clear memory .
3. Turn the ignition switch to OFF.
4. Register the ID code box. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.
5. After 5 seconds or more, read the DTC of «Engine» using the Subaru Select Monitor. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .
Is DTC B1577 displayed? (Current malfunction)

Yes: Replace the ID code box. Ref. to SECURITY AND LOCKS>ID CODE BOX .

No: Even if DTC is displayed, 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.