Brake Light Bulb: Description and Operation

The brake system indicator light comes ON to alert the driver that the parking brake is applied, or that the brake fluid level is low. It also comes ON as a bulb test when the engine is cranked.

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.