Stoplamps

When the brake pedal is depressed, the TCC/stoplamp switch contacts will close in order to light the stoplamps. The TCC/stoplamp switch voltage is always available from the STOP fuse 1 through the ORN 140 wire. When the brake pedal is depressed and the switch contacts close, the voltage becomes available on the WHT 17 wire. The WHT 17 wire distributes the voltage to the following components:
- The stoplamp bulbs
- The center high mounted stoplamp (CHMSL)
- The trailering wiring provision connector C406, if provided

The CHMSL is a diode array assembly. The WHT 17 wire provides voltage to the following components:
- The hazard warning switch
- The turn signal switch

This circuit is used for the trailer wiring provision when the single bulb turn/stoplamps are wired. The switch logic enables a single bulb on the DK GRN 19 or the YEL 18 wires in order to operate as a [1][2]turn signal lamp while the brake pedal is depressed.

The left and right tail lamps contain the following bulb types:
- Single stoplamp bulbs
- Single parking lamp bulbs

Both bulbs in the left tail lamp are grounded by the BLK 150 wire to ground G400. Both bulbs in the right tail lamp are grounded by the BLK 250 wire to ground G401. The CHMSL is grounded by the BLK 150 wire to ground G400.