Exterior Lighting - System Operation and Component Description: Stoplamps

WARNING: This page is about a different car, the 2015 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

System Diagram

Courtesy of FORD MOTOR COMPANY

Stoplamps

The BCM monitors the input from the stoplamp switch. When the brake pedal is applied, voltage is routed to the BCM, indicating a request for the stoplamps. The BCM then supplies voltage to the stoplamps.

The BCM does not activate the stoplamps when the ignition is in OFF or ACC.

For vehicles equipped with incandescent rear lamps, the BCM uses 3 separate output circuits. The LH shared turn/stop lamp output circuit, RH shared turn/stop lamp output circuit and high-mounted stoplamp output circuit.

For vehicles equipped with LED rear lamps, the BCM uses 3 separate output circuits. The LH stop lamp output circuit, RH stop lamp output circuit and high-mounted stoplamp output circuit.

The BCM also provides Field Effect Transistor (FET) protection of the stoplamp output circuits. When an excessive current draw is detected, the BCM disables the affected stoplamp circuit driver.

Refer to: Module Controlled Functions - Overview .