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IGNITION SWITCH TSB Revision CHASSIS ELECTRICAL 54A-8 • Using scan tool MB991958 (MUT-III Sub Assem- • By operating two ignition keys that have been . OPERATION 1. When the ignition switch is turned to "ON" position, the PCM sends a requirement for the 2. When the immobilizer-ECU receives the requirement from the PCM, the immobilizer-ECU 3. The immobilizer-ECU judges the encrypted code with its code logic in itself. If they are identical, the 4. If the PCM cannot receive the encrypted code, the engine will be immobilized. CAUTION WHEN REPLACING IMMOBILIZER SYSTEM RELATED PARTS AC306415AB TRANS- POWER ENCRYPTED MUT-III POWERTRAIN CONTROL IGNITION IMMOBILIZER- ITEMS PCM IMMOBILIZER-ECU IGNITION KEY When replacing PCM - Replacement is not Replacement is not required. When rewriting PCM - Replacement is not Replacement is not required. When replacing Replacement not - Replacement is not required. When adding ignition keys Replacement not Replacement is not Register only additional ignition When adding ignition key Replacement not Replacement is not Register ignition key to be When ignition key is lost Replacement not Replacement is not Re-register all other ignition |