BCM Input Parameters:: Bi17
WARNING: This page is about a different car, the 1992 Oldsmobile Toronado. However, it is still accessible from the selected car via links, so may be relevant.
TURN SIGNAL input (BLANK DISPLAY) is HI when turn signal switch is in OFF position. When either directional is on, input will toggle between LO and HI, with bulb glowing in HI state.