How to deactivate onstar<br>Contact onstar. If you want to cancel your onstar service immediately, you will need to contact the company and speak with an adviser. [substeps] The simplest way to speak with an adviser is to press the blue button on the onstar system installed in your vehicle.
You may not cancel your onstar service immediately. 
( z1 possible :ARG1 ( z2 cancel :polarity - :ARG0 ( z3 you ) :ARG1 ( z4 service :mod ( z5 star ) :poss z3 ) :time ( z6 immediate ) ) )