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.

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.

   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.

   Is registration complete?

   Yes: Finish the diagnosis.

   No: Go to  3.

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.

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.

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 .