Programming and Relearning
HOW TO REGISTER ENCRYPTED CODERequired Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991911: M.U.T.-III Main Harness B
CAUTION: Because registering the encrypted codes is done after all previously-registered codes have been erased, you should keep all of the ignition keys that have already been registered accessible.
If the ignition key, Immobilizer-ECU, ECM is replaced or an ignition key is added, encrypted codes of all the ignition keys must be registered. (A maximum of eight different ignition key can be registered). Moreover, when the immobilizer-ECU has been replaced, you will need to use scan tool MB991958 to register the immobilizer-ECU and input the vehicle secret code and to register the password (secret code) into the immobilizer-ECU.
If an attempt is made to start the engine with an unregistered ignition key, cranking occurs, but fuel supply is cut off to disable the engine. In approx. 10 seconds, the immobilizer indicator will blink for approx. 30 seconds.
NOTE: ECM has an encrypted code for immobilizer-ECU, and the encrypted code is registered in the immobilizer-ECU and ignition key.
POINTS TO NOTE DURING OPERATION
If none of the functions can be used, check the diagnostic trouble codes, and after carrying out any necessary repairs, repeat the operation.
If an incorrect password is input five times in a row, the immobilizer-ECU judges that an unauthorized operation is being attempted. Start-prevention mode will be set, and engine operation will stop and all special functions will be disabled. If the ignition switch is turned to "ON" position and left in that position for approximately 20 minutes, "Unauthorized operation, start-prevention mode" will be cancelled.
KEY ID REGISTRATION
All ignition keys can be registered with scan tool MB991958. Additional ignition keys can be registered with or without scan tool MB991958.
REGISTRATION WITH THE SCAN TOOL MB991958
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
NOTE:
- Before registration, check that no DTC code is set. If a DTC code is set, resolve the problem beforehand.
- 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.
- If registering more than one key, do not disconnect scan tool MB991958 halfway through the registration process.
- 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.
1. Connect the scan tool MB991958 to the data link connector.
2. Turn the ignition switch to "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System select."
5. Choose "IMMOBILIZER" from the "POWER TRAIN" tab.
6. Choose "Special Function" from "IMMOBILIZER" screen.
7. Choose "Key registration" from "Special Function" screen.
8. Input the password, and then click the check mark icon.
9. If the key ID was registered successfully, "Progress" indication will turn active (gray). Then the registration process completes. If the key ID failed to be registered,' Complete" indication will turn active (gray).
10. 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. Key ID registration screen will be displayed, then register another key.
NOTE: A maximum of eight keys can be registered.
11. This completes the registration operation. Turn the ignition switch "LOCK" (OFF) and leave it off for approximately ten seconds.
12. Check that the engine can be started with each of the registered ignition keys.
13. Check that the immobilizer system DTC and MFI system DTC did not set.
14. If not DTC is shown, terminate the M.U.T-III.
15. Turn the ignition switch to "LOCK" (OFF) position.
16. Disconnect scan tool MB991958.
REGISTRATION OF ADDITIONAL KEYS WITH THE SCAN TOOL MB991958
Additional key(s) can be registered with the scan tool while keeping all existing key data.
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
NOTE: To register additional keys with the scan tool, two registered keys must be available.
1. Connect scan tool MB991958 to the 16-pin data link connector.
2. Turn the ignition switch to "ON" position.
NOTE: Before registration, check that no DTC code is set. If a DTC code is set, resolve the problem beforehand.
3. Carry out steps 3 to 6 of the sub-section "Registration with scan tool."
4. Choose "Transponder ID addition" from "Special Function" screen.
5. Input the password on the "Transponder ID addition" screen, and then click the check mark icon.
6. If an additional registration is made successfully, the screen will ask if another key is registered or not. If the third ignition key is registered, remove the key, which has been registered. Then insert the third key within five seconds, and then turn it to the ON position.
7. Register the additional ignition key according to step 6 above. The number of the registered ignition keys are shown on "The number of registered key" screen.
NOTE: A maximum of eight keys can be registered.
8. This completes the registration operation. Turn the ignition switch "LOCK" (OFF) and leave it off for approximately ten seconds.
9. Check that the engine can be started with each of the registered ignition keys.
10. Check that the immobilizer system DTC and MFI system DTC did not set.
11. If not DTC is shown, terminate the M.U.T-111.
12. Turn the ignition switch to "LOCK" (OFF) position.
13. Disconnect scan tool MB991958.
REGISTRATION OF ADDITIONAL KEY(S) WITHOUT USING THE SCAN TOOL
If the scan tool is not available, new key(s) can be registered by using two keys which have been registered to the vehicle (A maximum of eight keys can be registered to one vehicle). Follow the procedure below to register new key(s) to the vehicle.
NOTE: The registered key is the key that allows you to start the engine.
1. Turn "ON" the ignition switch by using the first registered key (key A), and wait for five seconds.
2. Remove the first registered key (key A).
3. Insert the second registered ignition key (key B), and turn it to the ON position.
4. After approximately 10 seconds the immobilizer indicator light should flash, and then additional registration mode is entered.
5. Check the immobilizer indicator light flashes, and then remove the second registered key (key B).
6. Insert the third ignition key, and turn it to the ON position.
7. The immobilizer-ECU identifies the new key to accept or reject it, and operates the immobilizer indicator (See the table).
8. If more new ignition keys are to be registered, repeat steps 1 to 7 above.
A maximum of eight ignition keys can be registered to one vehicle (If you attempt to register the ninth key, the immobilizer-ECU rejects the key). If any of the following conditions are satisfied, the additional key registration mode will terminate:
- The ignition switch has been on for more than 30 seconds.
- After the ignition key has been turned to the "LOCK" (OFF), the engine control relay is turned off.
- The scan tool has started communicating with vehicle systems.
9. After the registration mode has terminated, the additionally registered key(s) should allow you to start the engine.