For C0 And C5 Models: Trouble Symptom

Engine will not start.
The security indicator illuminates.
CAUTION: When the immobilizer control module is replaced, registration of the immobilizer system is required. For details, refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
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?	Go to step 2 .	Go to step 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?	Finish the diagnosis.	Go to step 3 .
3 PERFORM ECM REGISTRATION. Perform ECM registration. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.	Is registration complete?	Finish the diagnosis.	Go to step 4 .
4 CHECK DTC. Perform the Clear Memory Mode. < Ref. to CLEAR MEMORY MODE . > Read the DTC of the ECM. < Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >	Is DTC other than DTC B1571 displayed?	Perform the diagnosis according to DTC.	Go to step 5 .
5 PERFORM ECM REGISTRATION. Replace the ECM. < Ref. to ENGINE CONTROL MODULE (ECM) . > < Ref. to ENGINE CONTROL MODULE (ECM) . > Perform ECM registration. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.	Is registration complete?	Finish the diagnosis.	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 immobilizer control module. < Ref. to BODY INTEGRATED UNIT . >