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High Mount Stop Lamp Replacement

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.
GM2949004
Callout Component Name
Preliminary Procedure 
Remove the rear compartment lid inner panel trim. Refer to Rear Compartment Lid Inner Panel Trim Replacement .
1 High Mount Stop Lamp Nut (Qty: 3)
CAUTION:

Refer to Fastener Caution .

2 High Mount Stop Lamp
Procedure 
Disconnect the electrical connector.