System Description

WARNING: This page is about a different car, the 2005 Infiniti QX56. 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 3, and
To stop lamp relay terminal 1.

When the brake pedal is pressed, the stop lamp switch is closed and power is supplied

Through stop lamp switch terminal 4
To stop lamp relay terminal 3
Through stop lamp relay terminal 4
To rear combination lamp LH and RH terminal 2, and
To high-mounted stop lamp terminal +.

Ground is supplied

To rear combination lamp LH terminal 1, and
To high-mounted stop lamp terminal -
Through grounds B7 and B19, and
To rear combination lamp RH terminal 1
Through grounds B117 and B132.
With power and ground supplied, the stop lamps illuminate.