Red vs. Blue - Season 2 Episode 4
The Joy of Toggling

In order to repair Sheila, Church and Tucker try to determine how to activate the repair sequence in Churchs robot body. Church only manages to find the time and temperature function, but Tucker discovers a small switch on Churchs crotch. When flipped, it activates a strange beeping noise audible only to Church. Back at the Red Base, the Warthog begins to beep, and announces that its homing beacon has been activated.