Exterior Lighting - System Operation and Component Description: Stoplamps
System Diagram
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.
The BCM uses 3 separate output circuits. The LH stoplamp/turn signal output circuit, RH stoplamp/turn signal output circuit and luggage compartment lid stoplamps/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 - System Operation and Component Description .