Brake Lamp: Description and Operation

CIRCUIT OPERATION
Circuit A7 supplies power for the stop lamp switch. This circuit originates in the Power Distribution Center (PDC) and is protected by a 20 Amp fuse. The A7 circuit is spliced in the junction block and supplies voltage for the Ignition-Off Draw (IOD) fuse.

When the operator presses the brake pedal, the stop lamp switch CLOSES, and connects circuit A7 to circuit L50. Circuit L50 connects from the stop lamp switch to the stop lamps and the Center High Mounted Stop Lamp (CHMSL). Ground for the lamps is provided on circuit Z1 and terminates at the deck lid ground.