Except For C0 And C5 Models

Diagnosis start condition:

Battery voltage is 10 V or more.
The remote engine starter was not used to start the engine.

DTC detecting condition:

Reference code incompatibility between body integrated unit and ECM

Trouble symptom:

Engine will not start.
The security indicator illuminates.

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.

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.

Is the number of registration 0?

Yes: Go to 2.

No: Go to 3.
PERFORM IMMOBILIZER SYSTEM REGISTRATION .
Register the immobilizer system. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.

Is registration complete?

Yes: Finish the diagnosis.

No: Go to 3.
PERFORM ECM REGISTRATION .
Perform ECM registration. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.

Is registration complete?

Yes: Finish the diagnosis.

No: Go to 4.
CHECK DTC .
1. Perform the Clear Memory Mode. Ref. IMMOBILIZER (DIAGNOSTICS)>Clear Memory Mode .
2. Read the DTC of the ECM. Ref. 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.
PERFORM ECM REGISTRATION .
1. Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>ENGINE CONTROL MODULE (ECM) . Ref. to FUEL INJECTION (FUEL SYSTEMS) (H6DO)>ENGINE CONTROL MODULE (ECM)
2. Perform ECM registration. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.
Is registration complete?

Yes: Finish the diagnosis.

No: Refer to "Correspondence table when registration is not possible" in the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume. If the registration still does not work properly, replace the body integrated unit. Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT .