The treble chasers were dominant in last week's Champions League semi-final first leg, scoring four times without reply and travel to Spain as overwhelming favourites to reach next month's Wembley showpiece.
Heynckes has insisted that Bayern will resist the temptation to defend deep and must aim to score and kill off the tie against a dangerous Barca side.
He told the club's official website: "We should defend with a high line and try to impose our playing style on them.
"We need to try and score a goal or two, and it's a possibility. They'll press the ball from the start and try to put us under pressure."