Tundra 4WD V8-4.7L (2UZ-FE) (2003)
Seat Belt Reminder Lamp: Testing and Inspection
INSPECT DRIVER'S SEAT BELT WARNING LIGHT
a. Disconnect the connector B from the combination meter.
b. Connect the negative (-) lead from the battery to terminal 9.
c. Turn the ignition switch ON and check that the warning light lights UP.
If the warning light does not light up, inspect the bulb or wire harness.