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Circuit/System Description

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.

Park Lamps - Primary 

When the headlamp switch is placed in the HEAD or PARK position, ground is applied to the park lamp switch ON signal circuit to the body control module (BCM). The BCM responds by applying voltage to the park lamps, side marker lamps, tail lamps, and license lamps control circuits illuminating the park, side marker, tail, and license lamps.

Park Lamps - Rear Auxiliary 

When the headlamp switch is placed in the HEAD or PARK position, ground is applied to the park lamp switch ON signal circuit to the body control module (BCM). The BCM responds by applying voltage to the park lamps, side marker lamps, tail lamps, and license lamps control circuits illuminating the park, side marker, tail, and license lamps. The BCM also sends a serial data message to the folding top control module indicating the park lamps are active. The folding top control module responds by applying voltage to the rear auxiliary tail lamps through there respective control circuits. The rear auxiliary tail lamps are activated when the B254 Rear Compartment Lid Position Sensor determines that the rear compartment lid is open.

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