Subaru Crosstrek Service Manual: Dtc b1571 reference code incompatibility (immobilizer cm to ecm)
KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC B1571 REFERENCE CODE INCOMPATIBILITY (IMMOBILIZER CM TO ECM)
DTC detecting condition:
Incompatibility of reference code between keyless access CM (model without ID code box) or ID code box (model with ID code box) and ECM occurs.
Trouble symptom:
Engine will not start.
| STEP | CHECK | YES | NO |
1.CHECK ECM.
Perform ECM registration. Refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.
Is ECM registration finished? And does the engine start?
ECM registration was not performed properly.
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1571 REFERENCE CODE INCOMPATIBILITY (IMMOBILIZER CM TO ECM)">Go to Step 2.
2.REPLACE ECM.
1) Install the ECM from other normal operating vehicle (with push button start) which use same ECM to the vehicle to be diagnosed.
2) Perform ECM registration. Refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.
Is ECM registration finished? And does the engine start?
Replace the ECM. Engine Control Module (ECM) > REMOVAL"> Install the ECM from other vehicle to the original vehicle.
Replace Keyless access CM (model without ID code box), Keyless Access CM"> or replace ID code box (model with ID code box). ID Code Box">
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To stop the alarm
Do any of the following operations
Press any button on the access key/
remote transmitter.
Turn the ignition switch to the "ON"
position (models without "keyless access
with push-button start system").
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