GM1210 Installation Guide



When installing the Rosen/Car Show GM navigation systems, there are some basic steps to take to insure that the installation is done correctly. Having been a professional car stereo installer since the mid-70s, trust me when I say that these tips will help you do the job easier, quicker, safer and will cause less damage and headache in the long run…

  • Call us for assistance: Although we try to anticipate most, if not all difficulties you may encounter in your installation, there will always be something that we don’t know or haven’t experienced. At ADC Mobile, we have over 100 years of professional car stereo installation experience, and it is very likely that we have gone through any problem you may be facing many dozens or hundreds of times. If you get stumped on any portion of your installation, we highly suggest that you re-read the installation guide, watch the videos and review the additional tech support before you call, but rest assured that we will always do our best to help you get through your installation. You can reach us via email or phone.  Visit the contact page for phone numbers and email addresses. Always try to reach Walt Ottenad first.
  • Use the right tools: Almost all GM installations will require some sort of specialized tools to accomplish the installation. Normally, for the GM-1210 installation, you will need nothing more than a 7 mm socket,  a 10 mm socket, possibly a Philips screwdriver and a simple plastic trim removal tool kit, which can be purchased from your local auto parts store or from an online retailer like Harbor Freight Tools for under $10. There is no excuse not to own a set of these trim tools, as they will come in very handy over the life of the vehicle, trust me. DO NOT USE A METAL TOOL TO PRY TRIM OFF! If you do, it is guaranteed that you will either damage the trim or scar the dashboard!
  • Read the installation manual: Although the unit will come with an installation guide produced by Rosen in the box, we have modified this manual  with much more pertinent information, tips and suggestions specific to this unit and most vehicles. It is embedded on the next tab. Please pay particular attention to those sections labeled “CRITICAL”. These sections outline parts of the installation that, if done wrong, will either damage the vehicle or damage your new unit!
  • Watch installation videos: There are many dozens, if not hundreds of installation videos online on YouTube and Vimeo. We have very detailed installation videos that may not use the particular model you have purchased, the installation processes shown are identical between different units. We strongly suggest that you watch as many of these as possible to familiarize yourself with the processes involved in removing your radio and the trim inside your vehicle. If possible, bring an iPad or laptop into the vehicle to play the installation video while doing the installation. If you don’t understand something, review the instructions or watch the video again.
  • Visit Owner’s Forums online: Most of our customers have either been referred from or have at least visited online owners forums. These are fantastic resources when it comes to solving problems you may encounter during the installation. If you get stuck on something that is not covered in a video or our tech support section, visit the forums and you most likely will find someone that has encountered the same issue and resolved it.
  • Gather all of the parts required: Once you have read the installation manual, you will have a good idea of what other parts may be required for your installation, such as additional USB cabling or RCA cables required to wire the factory camera into your new radio. Round all of this stuff up first, so that you don’t have to interrupt your installation and drive your vehicle half disassembled around town to source the parts that you are missing.
  • Install outboard accessories first: If you are planning on installing rear entertainment, a backup camera, other outboard sources or accessories, it makes much more sense to install those first, rather than doing the installation of the radio than having to remove it in order to wire other accessories. Even if you don’t think you will ever install a rear camera or rear entertainment system, it may make much more sense to run a set of RCA cables out of the dashboard to an easily accessible place so that if you do decide to add these accessories in the future, you don’t have to remove the radio in order to hook them up. Keep in mind that every time you remove the radio, you run the risk of breaking parts, pulling wires or plugs apart and setting codes in your vehicle. Try as much as possible to make the radio installation the last part of the system installation.
  • Take your time: GO SLOW! Most people will be able to get this installation done in under two hours in just about any vehicle, but if it takes longer than that, so be it. TAKE YOUR TIME AND BE PATIENT!  Almost all of the factory dashboard trim is pliable at normal temperatures, but once plastic gets below 40° – 45° or so, it gets very brittle very quickly. If you are working in cold weather, warm the interior of the vehicle prior to removing any plastic trim!
  • Bose Vehicles: In all vehicles with a Bose audio system, there will be very little room for the radio and all of the harnesses to fit in the radio hole. When you have all of the harnesses and that data box plugged into the back of the radio, you are going to swear there is no room for all of that to fit! Trust me, it will fit, but you have to be patient and very slowly work the harnesses into the cavities provided in back of the radio opening.  TAKE YOUR TIME WITH THIS STEP – DO NOT FORCE THE RADIO INTO THE OPENING! Make 100% sure that the radio is sitting completely flush on the mounting surfaces of the dashboard before you put the screws in. If you use the screws to force the radio to sit flat on the dashboard, you will distort the nose piece, and over time this will damage the radio. This damage will not be covered under warranty!
  • Test the System: Prior to finalizing the installation and reinstalling the screws and trim, make sure that you test all of the functions (AND I DO MEAN ALL)! There is nothing worse than getting it all put back together only to find out that you forgot to plug in one of the cables! Go through each of the functions one at a time, and actually test them – don’t just scroll through the sources.  In other words, play a DVD, listen to XM, pair up your phone and place a call using Bluetooth, etc.
  • Enjoy your new system: If you ever have any questions on the operation or set up of your system, or want to expand the system with cameras, rear entertainment, or outboard sources,feel free to contact us. We’re always happy to help!
Rear Chassis Ports:
Rear Panel Harness Connections

The rear chassis ports are color-coded and keyed so that the supplied harnesses can only be plugged into one port. Please keep in mind that each installation is unique and that all ports may or may not be populated when you are done.

Main Harness:
GM1210 Harnesses

The Main Harness is the large harness that has the foam-wrapped data box attached, as well as multiple connectors that will need to be connected. This harness is used in every installation.

The Main Harness Connector C1 (#9 above) will plug into the “X1” factory connector ONLY.

The Main Harness Connector C2 (#2 above) will plug into the “X2” factory connector ONLY. However, due to its design, Connector C2 may also slide onto the “X3” and “X4” connectors – THIS WILL RESULT IN LOSS OF XM AND/OR FACTORY REAR ENTERTAINMENT.

In the image above, the Main Harness is shown as configured for a Bose system installation (#3), but as it ships from the factory, it is ready to plug and play into a non-Bose system. If you have a Bose system, it needs to be configured as shown above using the PP-GM1210-8 harness.

The black XM/OnStar audio connector (#1) will plug into the BLACK port on the GM-1210 and the CAN/UART Connector (#11) will plug into the BROWN port on the GM-1210


The External Power Outputs (#14) may be used to provide a fused constant 12V source (yellow) and ground (black), but the RED lead cannot support a draw of more than 500ma and cannot be used as an accessory source of power!


Data Module:
 The Data Module is the source of the chimes and turn signal tones, as well as functioning as the data interpreter for the factory data bus. It comes plugged into the Main Harness and has a zip-tie wrapped around it to insure the Main Harness does not become unplugged as the adapter is inserted into the dashboard during the installation.

If you have factory rear entertainment, you will need to plug in the small 10 pin connector on the PP-GM1210-6 harness into the end of the Data Module. To do this, slide the zip tie to one side in order to plug in the connector. Try not to remove the zip tie.

Since the chime and turn signal tones will be generated by this module and their volume will be determined by its placement, you will want to test the volume BEFORE you finalize the installation. The volume can be lowered by the adjusting the placement of the module, or by wrapping foam or tape over the speaker.

This is the pre-out adaptor that will be used in Bose system installations. THIS HARNESS WILL BE USED ONLY IF YOU HAVE A BOSE AUDIO SYSTEM.

The GM-1210 ships from the factory with the standard speaker connector plugged in and is ready for all non-Bose installations right out of the box. The picture of the Main Harness  shows how to connect this harness for Bose system installations (#3 – Bose amplified pre-outs)the Main Harness Speaker Connector is wrapped in foam and has a bright pink tag on it.

For BOSE systems, unplug the connector with the pink tag in the main harness and plug the BLACK end of this plug into the female side of that plug.

Once the BLACK plug is connected, plug the YELLOW end of this harness will plug into the YELLOW port on the rear of the GM-1210.

This is the Bose Centerpoint adaptor and will only be used if you have a Bose Centerpoint audio system.

Centerpoint is a digital amplifier system that can be identified by the presence of a center speaker on the top center of the dashboard in the LTZ or higher trim levels of the Silverado, Suburban, Tahoe and the Sierra Denali and Yukon Denali. Buick Enclave & GMC Acadia have a center speaker, but they DO NOT have the Bose Centerpoint system.

Connect this harness to the brown “X4” factory connector. Once connected, the YELLOW end of this harness will plug into the YELLOW port on the GM-1210.


This harness contains the also contains the AV2 & rear camera inputs, which will be used if you have the optional accessories.

Connect this harness to the gray or black “X3” factory connector, and once connected, the green connector on this harness will plug into the GREEN port on the GM-1210 and the gray connector will plug into the GRAY port on the GM-1210. The small black 10-pin connector will plug into the end of the Data Module (move the zip tie on the Data Module to one side in order to plug it in)

NOTE: If you are adding an AFTERMARKET rear entertainment system, this harness will not be used.

This is the output harness that will be used for adding aftermarket amplifiers for 4 channel and subwoofer use. This will NOT be used if your system is using the factory Bose amplifier.

This harness contains Front/Rear/Left/Right RCA outputs as well as two RCA subwoofer outputs.

The yellow connector on this harness will plug into the YELLOW port on the GM-1210.

This is the AV2 input harness that will be used for adding an aftermarket rear camera, front camera, or inputting a hard-wired outboard A/V source. If you have the factory backup camera already and want to adapt it to the GM-1210, please see our camera support page for wiring instructions.

The green connector on this harness will plug into the GREEN port on the GM-1210.

The camera is accessed via the “CAMERA” source and AV2 is accessed via the “AV2” source.

The AV2 source can be switched to display on rear entertainment screens.

This is the rear entertainment output harness that would be used to display DVD/AV1/AV2 sources on aftermarket rear entertainment monitors.

The gray connector on this harness will plug into the GRAY port on the GM-1210.

If you are using a Car Show or Rosen brand headrest system, the remote control input should be connected to this harness, allowing the rear seat passengers to have control of DVD playback via remote.

This is the AV1 input harness that will allow an outboard A/V source to be plugged into the 3.5mm mini headphone jack located on the face of the GM-1210. It is accessed via the “AV1” source.

The mini headphone connector on this harness will plug into the mini headphone port on the face of the GM-1210.

The AV1 source can be switched to display on rear entertainment screens.

This harness is for the optional Sirius/XM tuner and is not supplied with the unit – it is only used in a vehicle that DOES NOT have factory XM radio. In a vehicle equipped with factory XM, there are no additional connections required. However, the factory XM tuner option on the GM-1210 is not enabled by default. You must enable the factory XM tuner in the installer menu or you will not be able to choose it as a source! See the “XM TUNER SETTINGS” tab to enable the factory XM tuner.
Factory Harnesses:
Basic Connections Basic Connections When you remove the factory radio, you will be removing multiple connectors that were plugged into the factory radio. The picture at left shows the most basic plug arrangement possible in a 2010+ GM vehicle with a factory USB jack. If your vehicle does not have a factory USB jack, the USB cable will not be present.Use this photo as a guide for the proper use of the Car Show connectors.

  • X1: BLACK (Power/ground/data/speakers)
  • X2: BLACK or YELLOW (Speakers)
  • USB: Factory USB jack
  • ANTENNA: Factory antenna
X4/X3/X2/X1 Connectors X4/X3/X2/X1 Connectors Depending on your trim level and factory installed radio & accessories, your radio may also have more plugs present. NOTE: not all plugs will have exactly the same functions in all systems (especially “X4”)Use this photo as a guide for the proper use of the Car Show connectors.

  • X1: BLACK (Power/ground/data/speakers)
  • X2: BLACK or YELLOW (Speakers)
  • X3: GRAY or BLACK (Rear Entertainment)
  • X4: BROWN (Rear camera/subwoofer)
Factory USB:
Factory harness mini-USB male connector Factory mini-USB male connector Most 2010-Up GM vehicles came with a factory USB jack, and have the factory connector shown at left. This mini-USB male connector will plug right into the mini-USB female harness on the back of the GM-1210.If your vehicle did not come with a factory USB jack and you want to use the USB input, you will have to source a USB cable and/or a USB jack of some sort. Here are some of the most common methods to connect USB:

If you need any guidance on what to purchase to accomplish any of these methods, please contact us.

Factory Camera:
X4 Connector camera connections X4 Connector camera connections If you have are replacing a factory navigation system, you may have a factory camera that displays there instead of the mirror. In order to wire the camera into the GM-1210, we can supply a plug and play adaptor harness (for standard Bose systems only – not Centerpoint), or you can wire it in with a single RCA cable very easily.The camera’s video positive and negative leads are in the brown “X4” plug, pin 6 (PINK or WHITE) & pin 7 (BLUE). We will connect to these two wires with a single RCA cable. This doesn’t have to be anything fancy – just a spare RCA cable from around the house will do. Simply cut off one end of the RCA cable, then separate the center conductor and the outer copper braided wires. Connect the center conductor of the RCA cable to the PINK or WHITE wire in pin 6, and the outer copper braided wire to the BLUE wire in pin 7. You can use connectors to do this or a simple military splice. Tape up the connections to eliminate any risk of a short circuit, then plug the other end of your RCA into the rear camera input on the GM-1210 and enable the camera in the menu.For other factory camera connection options please see our Camera Support page.
2007-13 Silverado LTZ w/Bose: OGM1 Installation

2007-13 Silverado LT: OGM1 Installation

GMC Yukon: Navigation Installation

GMC Acadia: Radio Removal

Chevrolet Traverse: Navigation Installation

Chevrolet Impala: Radio Removal

Buick Enclave: Radio Removal

GM Truck & SUV: Rosen Headrest DVD Installation

Although the videos above do not specifically show the GM-1210 installation, they will show you how to remove the factory radio and re-assemble the vehicle. We intend to expand this section with more product-specific videos soon.
NOTE: If you do not own a set of plastic trim tools as shown in the videos, Harbor Freight sells a great set for $6.99

Silverado/Sierra-Non Bose

Silverado/Sierra-Bose Acadia
Silverado/Sierra LT Silverado/Sierra Bose Acadia
Express/Savanna Equinox Impala
Express/Savanna Equinox Impala
Traverse Lucerne Enclave
Traverse Lucerne Enclave Radio
We suggest mounting the GPS antenna in the factory location whenever possible, as this will give you a clear view of the sky without being visible, and delivering the same performance as the factory. Refer to the drawings below to locate the factory navi antenna locations:
LTZ dash navi antenna location LTZ dash navi antenna location LT dash navi antenna location LT dash navi antenna location Traverse navi antenna location Traverse navi antenna location
GPS antenna location Silverado/Sierra GPS antenna location
Factory XM Settings Factory XM Settings The GM-1210 can accommodate either the factory XM tuner or an aftermarket Sirius/XM tuner. The radio ships with the factory XM tuner DISABLED in the menu. In order to use your factory XM tuner, you will need to enable it first.To do this, follow these steps:

  • From any Screen, select “Menu”
  • From the Menu select “Settings”
  • Press “Keypad,” Press “1120” and “Enter” to open the Installer Menu
  • On the “System” tab, hit the down arrow and on the “Sat Select” option, choose “Sirius”
  • Press “ResLink”
  • “Factory Sat” option needs to be set to “ON”.
  • Back out of the Installer Menu, shut off the vehicle and remove the key, open the door and wait at least 15 seconds (until the internal fan on the Rosen unit shuts off), then restart the radio
  • NOTE: If aftermarket Sirius/XM tuner (SXV200) is being used, “Sat Select” needs to be set to “Sirius/XM” and “Factory Sat” option needs to be set to “Off”
If your XM menu button displays “SXM” instead of “SAT”, your satellite tuner is set up incorrectly and you will only be able to access one set of six presets on the factory XM tuner. The video below covers the programming required to retain the three bands of XM presets that is explained above:

Factory Bluetooth Settings You have a choice to use the factory Bluetooth (if equipped) or use Bluetooth on the GM-1210. IF YOUR PHONE SUPPORTS IT, YOU MAY BE ABLE TO USE BOTH BLUETOOTH SYSTEMS SIMULTANEOUSLY.

In order to use the GM-1210’s Bluetooth system, you will need to enable it in the INSTALLER MENU first:

  • From any Screen, select “Menu”
  • From the Menu select “Settings”
  • Press “Keypad,” Press “1120” and “Enter”
  • Press “ResLink”
  • On the “Rosen BT” menu, switch it to “ON” – you will now be able to use the Car Show’s Bluetooth system
Mic mounted on headliner Mic mounted on headliner Although the GM-1210 system has an internal microphone that will work acceptably (provided the vehicle is not moving), we have found that the external microphone is higher quality and sounds better, provided it is mounted correctly.

This mic is designed to be mounted in free air (free air means that both the front and the back of the mic will be open to the cabin environment) and will usually work the best when it’s mounted on a soft surface (like the headliner) and isolated from any contact with hard surfaces in the vehicle (such as dashboard, trim panels and windshield).

We HIGHLY recommend the headliner location due to its isolation from vehicle vibrations, the proximity to both driver and passenger, and the distance from sources of noise in the cabin, such as open windows, A/C vents, etc. We have found it to be the best option for the vast majority of vehicles we work on. Having done literally hundreds of these installations, we recommend mounting the microphone on the headliner as shown at left, centered near the rear view mirror.

Slide the “C” clip over the leading edge of the headliner, but be certain that the rear of the clip does not touch the windshield! If necessary, add a small piece of foam tape or a small square of Velcro to insulate the clip from contact with the windshield to reduce any noise that may be transmitted into the mic. You can easily route the microphone cable down the passenger side “A” pillar, then behind the glove box over to the radio.

Bluetooth Settings Bluetooth Sensitivity Settings For the initial setup, we recommend to go into the settings for Bluetooth, then change the microphone setting to “EXTERNAL”, and reduce the microphone gain to between 2 and 5. Place a call while driving and experiment with the sensitivity settings to get the best response.Higher settings will boost the microphone volume, allowing the caller to hear you better, but generally results in elevated road and background noise. We have found settings under “5” work the best.
There is a PINK parking brake wire that is designed to monitor the position of the parking brake and only allow video from the DVD or other outboard sources to be displayed when the parking brake is engaged.To demonstrate video while in motion, the PINK parking brake wire may be grounded to chassis ground. This will allow video to be displayed as long as this wire is grounded.IMPORTANT: This is to be used for demonstration & testing purposes, for off-road use ONLY.