Deleting Old Transmitter Codes
WARNING: This page is about a different car, the 2004 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
The control unit of the keyless entry system has four memory locations to store transmitter codes, giving it the ability to operate with up to four transmitters. When a transmitter is lost, the lost transmitter's code remains in the memory. For security reasons, lost transmitter codes should be deleted from the memory.
To delete old transmitter codes, program four transmitter codes into the system. If only one current transmitter is available, program it four times. If there are two current transmitters, program each one twice. If there are three current transmitters, program two of them once and the third one twice. This process will leave only current transmitter codes in the system's memory.