CarKey Memory

The car memory contains vehicle function settings that can be changed to suit market and customer preferences. In some markets, some of the functions in the car memory are blanked out due to marketing and statutory requirements. Where available, the settings can be changed using T4.

The key memory is based on the car memory, and contains function settings that can be personalized to an individual driver. Different drivers are recognised indirectly through the remote control transmitter in the key. Up to four different keys can be recognised by the BCU. The key memory settings can be changed using T4.

The BCU broadcasts driver recognition on the P bus and the K bus to the following control modules, which also contain personalized key memory settings:

• Driver door module, for memorized door mirror settings
• Memory seat ECU, for memorized driver's seat and steering column settings
• Radio, for memorized tone, audio source and station settings.

The driver recognition messages contain the key number, the button pressed on the remote control and whether the key is valid or not. The key number is contained in the unlock transmission of the remote control keys, so personalized settings are only recalled after the vehicle has been unlocked with the remote control of one of the key numbers stored in the key memory. If the vehicle is unlocked with the key in the driver's door lock, the BCU identifies the key as invalid and control modules with personalized settings recall the last used setting. The BCU outputs the driver recognition message when it detects:

• An 'unlock' command from a remote control (the signal is sent immediately so that the correct positions for seat, door mirrors and steering column can be set)
• Any other actuation by remote control (when the remote control 'lock' command is detected, seat motion to a memorized position is stopped)
• Operation of the central locking system by other than a remote control
• A change of state of the ignition switch
• A driver recognition enquiry from another control module.

The seat and steering column memories are coded with an automatic movement option for the driver's seat, door mirrors and steering column. The options are:

• No automatic setting
• Automatically setting the positions in response to the remote control 'unlock' command
• Automatically setting the positions in response to the remote control 'unlock' command and opening of the driver's door.

Automatic movement of the seat can be stopped by pressing the remote control 'lock' button or any of the seat adjustment or memory switches. Automatic movement can be restarted by pressing the remote control 'lock' button again. Pressing the 'unlock' buttons (for selective central locking) and 'unlocking the boot' does not stop automatic seat movement.

Storage of personalized settings is automatically updated for each setting change provided a valid remote control key has been detected (interruption of the automatic recall movement of the driver seat, door mirrors and steering column is not interpreted as a setting change). The last setting for the recognized driver is automatically stored in the key memory area of the corresponding control module. If no valid remote control key has been detected, setting changes are stored in a recall memory for retrieval when an invalid key is detected.

The following table contains the car and key memory functions that can be changed (depending on market) using T4.