Caution When Replacing Immobilizer System Related Parts
To replace immobilizer system related parts, Refer to the table below. When the ignition key is re-registered with scan tool MB991958, the originally registered ignition key registration information will be lost.
IMMOBILIZER SYSTEM RELATED PARTS REFERENCE
| ITEM | PCM | IMMOBILIZER-ECU | IGNITION KEY |
|---|---|---|---|
| When replacing PCM | - | Replacement is not required | Replacement is not required. All ignition keys re-registration are required. |
| When rewriting PCM | - | Replacement is not required | Replacement is not required. Re-registration is not required. |
| When replacing immobilizer-ECU | Replacement not required | Replacement is not required. All ignition keys re-registration are required. | |
| When adding ignition keys newly (if registered ignition keys are not lost) | Replacement not required | Replacement is not required | Register only additional ignition keys to be registered. |
| When adding ignition key newly (if registered ignition keys are lost) | Replacement not required | Replacement is not required | Register ignition key to be added and re-register all other ignition keys. |
| When ignition key is lost | Replacement not required | Replacement is not required | Re-register all other ignition keys except the lost one. |