if i remember right, these are the steps (been awhile since i checked a SR ecu...

turn key to on
check for red light in ECU, turn clockwise, hold for 5 seconds, and return to original spot, coun flashes, 5 long, and 5 short = clear, no issues.

to get out of diog mode, repeat turning, holding for 5 seconds, and returning, till LED is steady red again....