Registration with scan tool MB991502

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

NOTE: Using the key ID register function will cause all key IDs that have been previously registered in the immobilizer-ECU to be erased. All keys need to be registered. Those which have been registered before should be on hand before using this function.

NOTE: If registering more than one key, do not disconnect scan tool MB991502 halfway through the registration process.

NOTE: After registering key IDs, check that the engine can be started using all of the keys that have been registered. If the engine will not start, refer to Immobilizer System Diagnosis RETRIEVING AND ERASING IMMOBILIZER SYSTEM DIAGNOSTIC TROUBLE CODES .

Connect scan tool MB991502 to data link connector (16-pin).

Fig 1: Connecting Scan Tool MB991502 To Data Link Connector (16-Pin)
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Turn the ignition switch to "ON" position.
At "System Select," press "YES."

Fig 2: Selecting System Select Key
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Select "Immobilizer," press "YES".

Fig 3: Selecting Immobilizer Key
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Select "Special Func," press "YES".
If DTC 11 exists, "Can't execute" will be displayed. Check for DTC 11 (Refer to RETRIEVING AND ERASING IMMOBILIZER SYSTEM DIAGNOSTIC TROUBLE CODES .)

Fig 4: Selecting Special Func. Key
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Fig 5: Display Can't Execute Message
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Select "key ID registr," press "YES".

Fig 6: Selecting Key ID Registration Key
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Input the password. Use the "UP" and "DOWN" keys to change the current password digit to a value between 0 and 9. Use the "LEFT" and "RIGHT" keys to move to a different password digit. Press the "YES" key to accept the password. If an incorrect password is input five times in a row, the immobilizer-ECU switches to unauthorized operation, start-prevention mode.
NOTE: Four separate digits must be input to make up the password.

Fig 7: Display Special Func Window For Entering Password
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Press the "YES" key to start key ID registration.

Fig 8: Pressing YES Key For Starting Key ID Registration
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This will be displayed when the key ID registration is successful. If an error occurs during key ID registration, the message "Can't execute" will be displayed. If the key has already been registered, "Key ID has been registered" will be displayed.

Fig 9: Display Complete Message After Successful Key ID Registration
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NOTE: A maximum of eight different keys can be registered.

The number of keys currently registered will be displayed. To register an additional key, replace the ignition key with the next key to be registered within five seconds and then press the "YES" key. Key ID registration screen will be displayed, then register another key.
If key ID registration is complete, press the "NO" key.
This completes the registration operation. Turn the ignition switch "LOCK" (OFF) and leave it off for approximately ten seconds.

Fig 10: Display Message For Another Key ID Registration
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Check that the engine can be started with each of the ignition keys.
Check that the immobilizer system DTC and MFI system DTC did not set.
Turn the ignition switch to the "LOCK" (OFF) position.
Disconnect scan tool MB991502.