System Description

WARNING: This page is about a different car, the 2006 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.

Power is supplied at all times

through 10A fuse [No. 20, located in fuse block (J/B)]
to stop lamp switch terminal 1, and
to stop lamp relay terminals 2 and 3 (with hill descent control and hill start assist).
When the brake pedal is pressed, the stop lamp switch is closed and power is supplied
through stop lamp switch terminal 2
to rear combination lamp LH and RH terminal 2
to high-mounted stop lamp terminal 1
to ABS actuator and electric unit (control unit) terminal 41, and
to stop lamp relay terminal 5 (with hill descent control and hill start assist). Ground is supplied
to rear combination lamp LH terminal 5
through ground B85, and
to rear combination lamp RH terminal 5
through ground B160, and
to high-mounted stop lamp terminal 2
through grounds B406 and B652.

With power and ground supplied, the stop lamps illuminate.