Enabling/Disabling the Horn Answerback Function
ENABLING/DISABLING THE HORN ANSWERBACK FUNCTION1. Remove the ignition key.
2. Press the "lock" button for 4 to 10 seconds and press the "unlock" button during this time.
3. Release the "lock" and "unlock" buttons within 10 seconds of pressing the "unlock" button in Step 2. The ETACS-ECU tone alarm will sound, indicating that the horn answerback function can be enabled or disabled.
- Enable the horn answerback function*: The ETACS-ECU tone alarm will sound once.
- Disable the horn answerback function: The ETACS-ECU tone alarm will sound twice.
- Enable the horn answerback function**: The ETACS-ECU tone alarm will sound three times.
NOTE:
*: The horn will sound if the doors are locked with the keyless entry system.
**: The horn will sound if the doors are already locked and the keyless entry lock button is operated.
HOW TO REGISTER SECRET CODE
CAUTION:
- When adding the ignition key separately, or replacing the components by the steering lock cylinder of illustration [A] (the ignition key is simultaneously supplied) or the key set of illustration [B], register the encrypted code. Refer to Encrypted Code Registration Criteria Table in Antitheft and Alarm Systems.
- When replacing the components by the door lock key cylinder of illustration [C] or the glove box lid lock cylinder of illustration [D], do not register the encrypted code with the bar code on the ignition key which is supplied to each lock cylinder simultaneously.
Required Special Tools:
- MB991958: MUT-III Sub Assembly
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991910: MUT-III Main harness A
Each individual secret code is registered inside the transmitter, and so it is necessary to resister these codes with the EEPROM inside the receiver in the following cases.
- When the transmitter or ETACS-ECU is replaced.
- If more transmitters are to be used.
- If it appears that a problem is occurring because of faulty registration of a code.
A maximum of four different codes can be stored in the EEPROM memory (four different transmitters can be used). When the code for the first transmitter is registered, the previously registered codes for all transmitters are cleared. Therefore, if you are using four transmitters or are adding more transmitters, the codes for all transmitters must be registered at the same time.
WHEN SPECIAL TOOL MB991824 (V.C.I.) IS USED
1. Check that the doors lock normally when the key is used.
2. Insert the ignition key.
CAUTION: To prevent damage to special tool MB991824 (V.C.I.), always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting special tool MB991824 (V.C.I.).
3. Connect special tool MB991824 (V.C.I.) to the data link connector.
4. Press the hazard warning light switch six times within 10 seconds.
NOTE: When the hazard warning light switch has been pressed six times, the ETACS-ECU locks and unlocks the doors automatically once. The ETACS-ECU is ready to register an encrypted code.
NOTE: The hazard warning light switch is a toggle switch.
5. Press the transmitter button, and then press it two times within 10 seconds of the first press. This will register the code.
6. When the encrypted code has been registered, the ETACS-ECU locks and unlocks the doors automatically once.
7. If you are using two or more transmitters or have added a second transmitter, the next transmitter should be registered within one minute after registering the code for the previous transmitter. The registration procedure is common for all the transmitter.
8. Registration mode will be canceled under the following conditions:
- When the secret code for four transmitters has been registered;
- When passing one minute after finishing the registration of all transmitters;
- When special tool MB991824 (V.C.I.) is disconnected;
- When the key is removed from the key cylinder;
9. After the registration is completed, remove the ignition key and close all the doors, and then check that the keyless entry system operates normally.