2008 Cadillac CTS With Original Antenna

2008 Cadillac CTS With 09 Shark Fin Antenna

Parts Needed P/N 25831184 (09 STS Antenna Base) P/N 25861955 (09 CTS w/U2K option antenna Base) P/N 25831387 (09 CTS w/o U2K option antenna Base) P/N 25831341 (09 CTS Crystal Red Fin) P/N 25831342 (09 CTS White Diamond Fin) P/N 25831344 (09 CTS Black Cherry Fin) Always verify the part numbers for your option and paint code

Rear Overhead Reading Lamp To Remove The Lamp Assembly You Gently Pry It Down Around The Perimeter 3 R-174 Coax Cables Attached to 08 Antenna Jack. There Is A Small Clip That Needs To Be Gently Pulled Down To Release The White ClipConnector Remove This Wiring Connector From Jack

Removal Of Original Antenna Alignment Pin (Not Used on Fin Antenna) Remove this 9/16” Bolt and Orange Clip 3 Coax Cables That Will Be Disconnected At Rear Of Headliner

Sail panel Carefully pry out Air Bag Access cover Then remove 5/16” screw This helps drop the back End of the headliner

Carefully Pry Out Air Bag Access Cover To Reveal And Remove 8mm Screw

Gently pry cover from the top out exposing 8mm screws to remove the access handles A jeweler’s screwdriver or a tool with a small hook on it is ideal to prevent damage to the cover

Gently pry cover from the top out On both sides exposing 8mm screws to remove the access handles

Remove the trim ring around the sunroof opening Gently pry the sides out then the back. This plastic ring will come out You will see how it goes together

There is a “rosebud” clip right here that attaches the headliner to the roof. Just pull down gently to bring rear headliner down. It goes back in very easily. Pull down right in middle of rear headliner

Red boxes show location of three coax connections above headliner XM Radio GPS Cell Phone

These are the 3 colors of plugs you will have to disconnect “C” Key GPS “D” Key OnStar Cell Phone “E” Key XM Radio

This is the type of connector (jack) that you will find above the headliner. There will be three: purple, blue and leaf green. Push here to Release plug

08 CTS 08 09 CTS 09 Note* By using the 09 STS antenna all you do is ensure the fakra connectors are the same color as originally This is an ‘08 CTS with the three leads. You must transfer these connector Ends to the 09. The colors of the Wires match. Just remove the connector ends and swap end per end Ensuring the wiring colors match

Locking Tab Fakra Removal - Tab Type 1. Carefully pry out the locking tab using a jewelers screwdriver 2. 2. Carefully pull cable out towards the rear of the connector.   Fakra Removal - Tab Type 1. Carefully pry out the colored locking tab using a jewelers Screwdriver (really only requires one “click”). 2. Lift up “c” shaped tab on adjacent side of connector 3. Carefully pull cable out towards the rear of the connector.

‘09 STS Antenna Base To remove coax cable use a jeweler’s screwdriver to pry up the pink clip on the side of the connector. It only has to go up one click

Step 2. Insert a small pick or something and pry up, this will release the coax connector

Remove Original Antenna on Roof This hole is not used for the fin and will have to be filled in with silicone or etc. After 9/16” Bolt and Orange Clip is Removed From Underneath Pull Antenna From Top of Roof

Need To Make Round Hole Square You will have to make the original 1” round hole into a 1” square hole. I used a 1” file to do this. Make sure the square is parallel to the rear of the roof I suggest the edges of this square be covered with primer, touch-up paint, etc. as desired

Install Replacement Antenna Alignment Pin (Not Used on Fin Antenna) Tighten this 9/16” Bolt and Mounting Clip. Note: 09 Clip is slightly different but works the same 3 Coax Cables That Will Be Re-connected At Rear Of Headliner

’09 STS Antenna Base (Top) OnStar Cell Phone GPS XM Shows ‘09 STS Base With The Three Connectors Configured For 08 CTS

OnStar Cell Phone GPS Top View Of Base With Orange Cover Removed XM Radio

Shark Fin Mounted on Roof With Protective Cover Still On Orange Protective Cover. This Will Be Removed Before the Fin Is Snapped On

Bottom of 09 STS Antenna Base

Bottom of White Diamond Color Shark Fin Cover

White Diamond Shark Fin Cover

’09 CTS Fin Antenna Attachment Points This The Final Step. Snap On The Fin Using The Attachment Points