According to a company spokeswoman the US-based supplier will concentrate on its in-house shows.
The decision was made to comply with demands by several carmakers to be shown new products exclusively before they are presented to the public.
Autoliv has also decided against exhibiting at the IAA and will instead do exclusive presentations to the carmakers.
"With the same budget that we need for one major exhibition we can take part in three to four house shows," said an Autoliv spokeswoman.
Lear will not stage a press conference in Frankfurt due to financial reasons and will send fewer members of the management board than usual to the exhibition.
But a spokesman for the Frankfurt show said he was pleased with the overall level of participation. He added: "Individual cancellations should not be taken too seriously."