Brake Lamp: Description and Operation

CIRCUIT OPERATION
Circuit F32 supplies power for the stop lamp switch. This circuit is protected by a 20 Amp fuse located in cavity 4 of the junction block.

Power for the fuse is supplied on the A7 circuit. This circuit connects from the Power Distribution Center (PDC) to the junction block, and is protected by a 20 Amp fuse located in cavity G. This circuit is also spliced in the PDC 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 F32 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 body lamps ground located at the left rear wheel well.

On the New Yorker and LHS models the CHMSL uses Light Emitting Diodes (LED's) instead of lamps. Power and ground for the LED's are the same as other models.