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Navigation Signal Splitter Replacement (Sedan)

WARNING: This page is about a different car, the 2016 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Navigation Signal Splitter (Sedan)
GM2812956Courtesy of GENERAL MOTORS COMPANY
Callout Component Name
Preliminary Procedure 
Remove the rear window panel trim. Refer to Rear Window Panel Trim Replacement (Sedan) .
1 Navigation Signal Splitter Fastener (Qty: 2)
CAUTION:

Refer to Fastener Caution .

2 Navigation Signal Splitter
Procedure 
Disconnect the electrical connector.