Good question. Foremost among other approaches is, that the Academician should be able to talk to the illiterate group in their own language to arouse interest and understanding.
The first step to promote awareness about education to the illiterate would be to make them know how learning is interesting and useful for their life. An academician should begin this step by hearing about their life and what they are interested in.
Academician should promote awareness about education through literate community. Members of community emphasis illiterates through communication, Schools are institutions that can prepare children to contribute to the betterment of the society . Education takes place most efficiently and effectively when these different groups of people collaborate. Communities can help identify and address factors that contribute to educational problems.
What are the different kind of approaches which an Academician can apply to promote awareness about education to a illiterate group?
Think this depend on what category of the illiterate group i.e. poor or rich categories of illiterate group because for different categories we need to handle differently & tactfully:
Poor Categories of Illiterate Group - academicians can motivate them to pursue education as a shield & as a way to break off the vicious cycle / chain of "the poor get poorer & the rich get richer". Share with them what education can do for them by transforming their quality of life & how their needs focus can elevate up from physiological to higher order needs like esteem / self-actualization etc.
Rich Categories of Illiterate Group - this category of rich people focusing on hard knock experience / trial & error whereby they are hardworking & determined (they might perceived academicians as people only with head knowledge & no "scars" of actual experience etc). Academicians can share with them how education can promote "doing the right things rather than doing the things right through hard knock / trial & error", transform their worldview / horizon to see things differently, how they can leverage on education to improve their lifestyle as well as their children lifestyle, share with them what are the harm with riches without education / educated intelligence etc.
Please revise your question... "What are the different kind of approaches which an Academician can apply to promote awareness about education to a illiterate group?"
You should write an illiterate rather than a illiterate.
Creating awareness by presenting scientific jargon in a manner palatable to the illiterate. StarTalk is an American talk show hosted by scientist Neil deGrasse Tyson; it is a good example of how questions from listeners are answered in everybody friendly language and discourse thereby promoting awareness about education.