Brake Light Bulb: Description and Operation

With the ignition switch in START (III), and the clutch pedal depressed or A/T gear selector in PARK (P) or NEUTRAL (N), voltage is applied through fuse 2 to the bulb check circuit. The bulb check circuit closes, allowing current to flow through the brake system indicator light and bulb check circuit to ground. The brake system indicator light comes ON to test the bulb.