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Metra 99-3018 Dash and Wiring Kit

Install and connect a new car stereo and retain OnStar, factory amp, and more in 2008-15 Cadillac CTS models — single- or double-DIN radios (Silver)

Item # 120993018S

You bought a 2008-15 Cadillac CTS — great car, but its console makes it impossible to upgrade the factory radio.

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You bought a 2008-15 Cadillac CTS — great car, but its console makes it impossible to upgrade the factory radio.

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Item # 120993018S

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About the Metra 99-3018 Dash and Wiring Kit

Bob Bihlmayer

Metra 99-3018

You bought a 2008-15 Cadillac CTS — great car, but its console makes it impossible to upgrade the factory radio. Metra's integration adapter allows you to install an aftermarket single- (2" tall) or double-DIN (4" tall) stereo in the Cadillac's dash panel, while maintaining all heating, ventilation, and air conditioning controls. The adapter also retains OnStar, the factory amp, Bluetooth®, and the aux input.

Metra 99-3018

You bought a 2008-15 Cadillac CTS — great car, but its console makes it impossible to upgrade the factory radio. Metra's integration adapter allows you to install an aftermarket single- (2" tall) or double-DIN (4" tall) stereo in the Cadillac's dash panel, while maintaining all heating, ventilation, and air conditioning controls. The adapter also retains OnStar, the factory amp, Bluetooth®, and the aux input.

The adapter is a perfect match for the color, texture, and contours of your Cadillac dash.

The package includes a harness that plugs directly from your Cadillac into the Axxess ASWC adapter (not included), allowing you to retain your steering wheel audio controls with a new car stereo.

Please enter your vehicle information or call an Advisor at 1-888-955-6000 to find out if this kit is compatible with your vehicle. Warranty: 1 year.


What's in the box:

  • Radio replacement interface module
  • Vehicle harness
  • Radio harness
  • Front speaker harness
  • Radio trim-panel
  • Pocket
  • Cover
  • 2 Brackets
  • 4 Large screws
  • 8 Small screws
  • 2 Plastic washers
  • 2 Metal clips
  • 2 Copper threaded inserts
  • Installation Instructions
MFR #99-3018S

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More details on the Metra 99-3018 Dash and Wiring Kit

Stacey B.

Product Research


Vehicle Compatibility: The Metra Turbo Kit (99-3018S) is designed specifically for select 2008-2014 Cadillac CTS vehicles (both amplified and non-amplified factory systems). The 99-3018S allows you to replace your factory radio with an aftermarket stereo and retain important factory functions, which otherwise would be lost. Compatible Cadillac CTS vehicles include:

  • 2008-2013 CTS (coupe/sedan)
  • 2014 CTS (coupe)
  • 2008-2014 CTS-V

    Note: The Metra 99-3018S kit is not compatible with CTS Sport Wagon models.

Single- or Double-DIN Dash Kit: The installation kit will fit most single-DIN or Double-DIN aftermarket head units (a pocket is included for Single-DIN installations. The kit features high-grade ABS plastic and is contoured to match your vehicle's factory dashboard color and texture.

Radio Replacement Module: The included radio replacement interface module allows the replacement of the factory radio in your compatible Cadillac CTS with an aftermarket head unit. This interface module allows you to retain factory features such as the factory amplifier, OnStar, steering wheel control (optional interface required), warning chimes, and factory Aux input. The interface module also provides data bus driven outputs for retained accessory power (RAP) and accessory power (+12V/10A). In addition, the interface includes navigation outputs like vehicle speed sensor (VSS), reverse trigger, and parking brake to make installation easier.

  • Factory Amplifier: You'll be able to retain your vehicle's factory amplifier (if equipped) with the ability to balance and fade from your new aftermarket stereo. This interface is also compatible with vehicles that are not equipped with factory amplified systems.
  • OnStar & Bluetooth Compatible: The 99-3018S is designed to retain the factory OnStar emergency services system, along with Bluetooth, that would normally be lost when your factory radio is replaced by an aftermarket head unit.
  • Retained Accessory Power (RAP) & Warning Chimes: The ignition power source of many vehicles keeps the radio on until one of the doors is opened. This feature is called the RAP (retained accessory power). The 99-3018S is designed to retain this feature, along with warning chimes.
  • Aux Input: To retain the vehicle's factory Aux input, your aftermarket head unit must have a rear-panel Aux input (male mini-to-female stereo RCA adapter may be required, sold separately).
  • Optional Steering Wheel Control Interface: The included wiring harness features a right-angle 3.5mm connector that lets you keep your vehicle's OEM steering wheel controls via the optional Axxess Steering Wheel Control Interface (item number 120ASWC1, sold separately).
  • Navigation Outputs: The 99-3018S provides a VSS (vehicle speed sense), Parking Brake, Mute, and a Reverse Gear output to make installing an aftermarket Navigation radio simpler and less time consuming.

Aftermarket Radio Connection: The Metra Turbo Kit (99-3018S) features the following hardwire connections to your aftermarket head unit and factory system.

Wire Color Function
Yellow +12 Volt Constant
Black Ground
Red +12 Volt Accessory
Blue/white Amp Turn-On
Orange/white Illumination Output (+)
White Left Front Speaker +
White/black Left Front Speaker -
Gray Right Front Speaker +
Gray/black Right Front Speaker -
Green Left Rear Speaker +
Green/black Left Rear Speaker -
Purple Right Rear Speaker +
Purple/black Right Rear Speaker -
Light Green Parking Brake
Green/purple Reverse Output (+)
Blue/pink VSS (vehicle speed sense)
Yellow/black OnStar Volume
Brown Mute

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Customer Q&A

12 questions already asked

Will the factory camera work with this set up?
anthony  Jul 19, 2023
1 answer
I do show that in some years and specific model CTS's the backup camera can be retained with a radio that supports it, Anthony. The Metra BACKUPCAM-2 adapter in the link below is needed in addition to the Metra 99-3018 dash kit. Use our online Vehicle Guide in the second link below to enter your vehicles exact year, make, model, and exact trim. Select your favorite radio that fits, and we will pair the 99-3018 kit, the backup camera adapter, and any other gear you'll need for the swap. We also list all the retained features you can keep to confirm! If you have any questions or need help placing your order do not hesitate to call us at 1-800-324-9695 and a live Advisor would be happy to help!
bo  Jul 19, 2023 (Staff)
I followed the instructions and installed the Alpine iLX-W650 in my 2010 CTS and I ran into a couple issues. My rear door speakers donâ??t work. My radio function donâ??t work, I can only play the radio or car play (only when itâ??s plugged in with usb though). Please help?
scarly  Sep 24, 2020
1 answer
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer.
kristina  Oct 15, 2020 (Staff)
Will this allow me to retain my clock? It's round
tim  Sep 27, 2019
5 answers
No your clock will no longer have a home on your dash
theo  Sep 28, 2019
Unfortunately this kit does eliminate the analog clock which sucks kind of cause I really like it. However what you gain with the better touch screen device /apple car play etc, makes it worth it to me. You'll also loose the outside temp reading.
joel  Sep 28, 2019
No. The stereo unit will take up the space where the clock used to be. The volume knob, tuning knob and clock will all be removed with the original plastic trim.
keith  Sep 27, 2019
Nope, it is removed with the aftermarket kit. If you like the clock then don't upgrade..
fredrick  Sep 27, 2019
No, this deletes the radio and clock panel up top and moves the climate controls down a little ways.
niles  Sep 27, 2019
What size screen will the DIN opening allow?
evan  Mar 14, 2021
2 answers
jermaine  Mar 14, 2021
Any double-DIN screen.
jeff  Mar 14, 2021
if eveyone says this will take any double din why does crutchfield say only 1 pioneer double din will fit?
bryan  Nov 08, 2020
3 answers
Chances are its not because of this dash bezel kit, its because the stereo itself is too big for that cts opening, when you click "doesn't fit" itll tell you why, with my car most pioneers measure too deep for the cadillac cts
nathan  Nov 09, 2020
I have Pioneer, so unfortunately I can't say about other brands, but I really don't see why not. The space will be limited in any case, so you may need to remove some plastic from the back (for cables). Also, There is another place that you will need to remove plastic in any case if you want double din unit - basically you combine some parts from the kit with original plastic parts, and one of those parts will abstruct the double din opening. So, you'll have to cut that plastic. You'll see what I mean, don't worry). So, the kit is no perfect, but it's ok. Good luck with your install, Caddy is not very user friendly to work with. Double measure everything.
vadim  Nov 08, 2020
I saw this same thing. I called Cruthfield and they confirmed it. Then I bought a Kenwood head unit locally and it fit just fine, though it is tight. I've done probably 100 head units and this one was the most time consuming one to do, so be prepared.
jeff  Nov 08, 2020
Is there a way to retain the exterior temperature reading with this kit after installed with the aftermarket stereo for the Cadillac CTS 2008-2013 or does that function go away with the new install?
john  Aug 12, 2020
1 answer
I don't see any mention about the temperature display. The stock display in the center of the dash appears to be removed. If the temperature can be displayed elsewhere then that should continue to work.
jason  Aug 22, 2020 (Staff)
I have a pioneer 7" in dash screen. Will it fit this kit?
dereck  May 19, 2020
3 answers
I have an alpine ilx-w650. It fit mine. Not sure it fits urs. Check the spec's
remus  May 20, 2020
It will fit all DIN and double-DIN head units. I've done around 100 installs on various vehicles and this one is by far the most involved. Lots of wiring, so be prepared and take your time.
jeff  May 20, 2020
Yes it should ,
patrick  May 20, 2020
When using the ASWC-1 adapter, does it plug in to this harness without additional wiring? When picking the radio type, should it be Metra OE (for the adapter) or in this case Kenwood (for the head unit itself?
charles  May 04, 2020
2 answers
I can't mine doesn't work
andy  May 08, 2020
The 99-3018 comes with another ASWC-1 harness which has the wires pre-connected . You end up not using the harness that comes with the ASWC-1 kit. The instructions for the 3018 makes reference to this fact although it is not clear. You do not have to pick the radio type, it self programs. I was connecting a Kenwood DMX7706s and it figured out which radio it was connecting to without problem when it first started. Again, the Metra 3018 instructions cover this.
jorge  May 04, 2020
What becomes of the factory pop-up screen? 2011 CTS-V
richard  Apr 13, 2020
4 answers
Dont use it if you have a pop up screen to much work. Only with performance cts.
jermaine  Mar 14, 2021
You put the filler piece in its place (removal of the screen)
scott  Apr 13, 2020
The screen goes away and is replaced with a trim piece like the unit without the pop up screen.
jeff  Apr 13, 2020
patrick  Apr 13, 2020
Is this all that would be needed to retain my steering wheel controls or do i need the ASWC-1 module also?
charles  Oct 02, 2017
4 answers
you need the module too
michael  Oct 03, 2017
I also had to use the ASWC-1 Steering Wheel Control Adapter. Without it the steering wheel controls do not work.
anthony  Oct 03, 2017
you will need the Metra ASWC-1 steering wheel control. Mine works great and looks good also.
gilbert patrick  Oct 03, 2017
You will need the ASWC-1
ramsey  Oct 03, 2017
What are the maximum dimensions of a double din unit that the cts can accommodate with this this dash kit?
brian  Jan 02, 2017
3 answers
jermaine  Mar 14, 2021
Double DIN is a standard size. With this kit, the CTS will take a double DIN
michael  Oct 03, 2017
The chassis of a double din radio is roughly 6.8" wide and 3.9" tall (typically rounded to 7" x 4") and that is the dimensions this kit will take. If you have any further fitment questions, feel free to contact an advisor by calling 1-800-324-9695 for help! My Bio:
jason  Jan 10, 2017 (Staff)

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