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Radio Antenna Base Replacement

WARNING: This page is about a different car, the 2018 Cadillac XTS. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Radio Antenna Base & Mounting Components
GM2753810Courtesy of GENERAL MOTORS COMPANY
Callout Component Name
Preliminary Procedure 
Lower the rear of the headlining trim panel. Refer to Headlining Trim Panel Replacement (Without Sunroof)Headlining Trim Panel Replacement (With Sunroof) .
1 Radio Antenna Base Fastener
CAUTION:

Refer to Fastener Caution .


Tighten 
9 N.m (80 lb in)
2 Radio Antenna Base Retainer
3 Radio Antenna Base
Procedure 
Disconnect the electrical connectors.