S15/T15 Sonoma P/U 2WD V6-262 4.3L VIN W CPI (1994)
Center Mounted Brake Lamp Relay: Locations
Center mounted brake lamp relay is one of the middle relays. Check the wires going to the relays.
The one with:
2 white
1 black
1 brown/white
is the center mounted brake lamp relay.
