When the AP engaged and proper mode selection is not made AP will switch CWS ROLL,CWS PITCH mode and flashing amber CWS PITCH,CWS ROLL announciaitons on FMA will come on and ask you to give proper roll and pitch modes.As you select your roll and pitch modes it will engage and FD will display your selection(ie: press HDG SEL and FD will show guidance to selected heading on MCP)