IF YOU CONFIRM: * "Missing SD card" message appears. * Error message "Communication problem occurred check connection" with iPhone (1st Generation only). Connected through USB and after an incoming call. * No Voice guidance after unit replacement or software update. ACTION: 1. Check the SD card number. * Update SD card if 25920-ZW00A is present. 2. Update NAVI to N603 Software version. 3. Confirm that voice guidance operates correctly after NAVI version has been updated. Please see this bulletin for further details.