The combination of an automotive vehicle and a backlight heater and timing control means;
- wherein said vehicle comprises a backlight with electrically energizable heater means associated therewith and vehicle-engine energizing switch means;
- and wherein said backlight heater and timing control means comprises an electrical switching and timing assembly;
- said electrical switching and timing assembly comprising manually actuatable second switch means selectively closable and openable;
- circuit means having an input end and an output end;
- said input end being electrically connected to said vehicle-engine energizing switch means and to a source of electrical potential;
- said output end being operatively electrically connected to said heater means;
- said circuit means comprising electrical timing means effective for opening said circuit means upon the expiration of a preselected span of time after said circuit means has been closed by said manually actuatable second switch means;
- and wherein said manually actuatable second switch means, said circuit means, said input and output ends and said timing means are operatively carried by unitized support structure;
- said unitized support structure comprising first, second, third and fourth integrally formed side walls and a back wall integrally jointed to said side walls and extending generally transversely thereof as to thereby effectively form a closed back end of said support structure;
- said first, second, third and fourth side walls cooperating to define a generally main housing portion having an open front end generally opposite to said back end;
- printed circuit board means receivable within the space defined by said main housing portion;
- said printed circuit board means being insertable into said space and withdrawable from said space through said open front end;
- said printed circuit board means carrying said circuit means, said circuit means comprising electrical relay means also carried by said printed circuit board means;
- said input end of said circuit means comprising relatively rigid first electrical terminal means carried by said printed circuit board means and extending through said back wall;
- said output end of said circuit means comprising relatively rigid second electrical terminal means carried by said printed circuit board means and extending through said back wall;
- said manually actuatable second switch means comprising switch contact means and a manually positionable switch lever;
- said switch contact means being carried by said printed circuit board means;
- a front wall for effectively closing said open front end;
- said front wall pivotally carrying said manually positionable switch lever;
- said front wall with said manually positionable switch lever carried thereby being detachably securable to said main housing portion as to effectively close said open front end and place said manually positionable switch lever in position for operative engagement with said switch contact means;
- said front wall with said manually positionable switch lever carried thereby being detachable and removable from said main housing portion without causing withdrawal of said printed circuit board means from said space.