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IGNITION SWITCH TSB Revision CHASSIS ELECTRICAL 54A-16 DTC12: Encrypted Codes are Not the Same or Not Registered. . DTC SET CONDITION The encrypted code sent by the transponder is not . TROUBLESHOOTING HINTS • The encrypted code in the ignition key has not been properly registered • Malfunction of immobilizer-ECU . DIAGNOSIS Was the encrypted code registered? YES : Replace the immobilizer-ECU and then re-register the encrypted code (Refer to NO : Register the encrypted code (Refer to SYMPTOM CHART M1543007201105 CAUTION During diagnosis, a DTC code associated with SYMPTOM INSPECTION REFERENCE PAGE Communication with scan tool MB991958 is impossible. 1 The ignition key cannot be registered. 2 Engine cranks, but does not start. 3 The immobilizer indicator light does not illuminate. 4 |