Taken from:
http://consumerguideauto.howstuffwor...ota-matrix.htm
Year to Year Changes
2004: Toyota Matrix: Toyota's compact wagon changed little for 2004. An in-dash CD changer was optional in the XR and XRS, and the available navigation system was exclusive to XRS. During 2004, output of the XRS engine dropped to 170 horsepower.
2005: Toyota Matrix: An antiskid system became optional on front-drive versions of the 2005 Matrix, if equipped with an automatic transmission. Head-protecting curtain side airbags were now offered in an option group that also included front torso side airbags. All models exhibited a new front bumper, grille, and clear-lens taillamps. Toyota no longer offered a navigation system in the Matrix.
2006: Toyota Matrix: 2006 brought no changes for the Matrix.