Keyless Entry Transmitter: Testing and Inspection
This article reflects the changes called out by TSB 04-42a-006HOW TO REGISTER SECRET CODE
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 VEHICLES COMMUNICATION INTERFACE (V.C.I.) MB991824 IS USED
1. Insert the ignition key into the key cylinder and check that the doors have been locked normally when the ignition key is turned.
2. Insert the ignition key into the key cylinder.
CAUTION: Turn the ignition switch to the "LOCK" (OFF) position and then connect vehicle communication interface (V.C.I.) MB991824 to the data link connector.
3. Connect vehicle communication interface (V.C.I.) MB991824 to the data link connector.
4. Press the hazard warning light switch six times within 10 seconds.
NOTE:
- At this time the code registration monitor request is sent and becomes registration mode (all doors locked and then all doors unlocked).
- The hazard warning light switch is turned ON and OFF alternately whenever the hazard warning light switch is pushed.
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 registration is completed, the code registration monitor request is sent (all doors locked and unlocked).
7. If you are using two or more transmitters or have added a second transmitter, the next registration procedure should be registered within one minute after registering the code for the previous transmitter. The registration procedure is common for all the transmitters.
8. Registration mode will be canceled under the following conditions:
- When the secret code for four transmitters has been registered;
- When one minute has passed after finishing the registration of all transmitters;
- When no secret codes have been registered for more than one minute after the registration mode is entered;
- When vehicle communication interface (V.C.I.) MB991824 is disconnected from the data link connector;
- When the ignition key is removed from the ignition key cylinder;
9. After the registration is completed, carry out the following work.
CAUTION: Turn the ignition switch to the "LOCK" (OFF) position and then disconnect vehicle communication interface (V.C.I.) MB991824 from the data link connector.
10. Disconnect vehicle communication interface (V.C.I.) MB991824 from the data link connector.
11. Remove the ignition key from ignition key cylinder.
12. Close all of the doors.
13. Verify the keyless entry system operates normally.