This is a switch that creates the spark that lights the gas and starts the burners.
When the gas burner valve knob is depressed and turned, this part creates a spark that lights the gas and starts the burner.
Turned off the gas then disconnected the gas line. Unplugged the AC cord and removed the unit from the counter top. Had to locate a suitable area to lay the cooktop, rather large. The bottom cover is held on by 6-8 sheet metal screws, however, the gas regulator and nipple must be removed also for the cover to come off. I removed the Igniter module screws, leaving the wires connected and mounted the new module in it's place. I then removed one wire at a time from the old and put it on the new part. Replaced the back cover and reinstalled the gas regulator with fresh pipe sealant. Probably took an hour including cleaning the top and counter top.
I used a screwdriver to pry the electrode assy. out of the burner. then disconnected the wire. Then just connected the new electrode and place the assy, in the burner.
Disconnected gas & electric connections; lifted unit out of countertop onto padded table upside down. Unscrewed ~16 sheet metal screws for access. Removed bad ignitor by driving off retaining clip. Had to remove burner (3 screws) for access to install retaining clip on new ignitor. Reassembled, reinstalled. Works like new!