please help for help us tacograh

hello

i have tacograph of the truck renault year 2010

mark of tacograph is siemens vdo

it open unit, but not appear eeprom reconocidez

ref tacograph 7421593342

ref hardware board a2c53342591 kcf1 1012 l1

a2c53332853 vdo

i need to know ic for to put in tacograph second hand kilometers of the truck

thankjs